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常用工具集/Utility/Network/S7netplus/COTP.cs

@@ -0,0 +1,118 @@
+using System;
+using System.IO;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace S7.Net
+{
+
+    /// <summary>
+    /// COTP Protocol functions and types
+    /// </summary>
+    internal class COTP
+    {
+        public enum PduType : byte
+        {
+            Data = 0xf0,
+            ConnectionConfirmed = 0xd0
+        }
+        /// <summary>
+        /// Describes a COTP TPDU (Transport protocol data unit)
+        /// </summary>
+        public class TPDU
+        {
+            public TPKT TPkt { get; }
+            public byte HeaderLength;
+            public PduType PDUType;
+            public int TPDUNumber;
+            public byte[] Data;
+            public bool LastDataUnit;
+
+            public TPDU(TPKT tPKT)
+            {
+                TPkt = tPKT;
+
+                HeaderLength = tPKT.Data[0]; // Header length excluding this length byte
+                if (HeaderLength >= 2)
+                {
+                    PDUType = (PduType)tPKT.Data[1];
+                    if (PDUType == PduType.Data) //DT Data
+                    {
+                        var flags = tPKT.Data[2];
+                        TPDUNumber = flags & 0x7F;
+                        LastDataUnit = (flags & 0x80) > 0;
+                        Data = new byte[tPKT.Data.Length - HeaderLength - 1]; // substract header length byte + header length.
+                        Array.Copy(tPKT.Data, HeaderLength + 1, Data, 0, Data.Length);
+                        return;
+                    }
+                    //TODO: Handle other PDUTypes
+                }
+                Data = new byte[0];
+            }
+
+            /// <summary>
+            /// Reads COTP TPDU (Transport protocol data unit) from the network stream
+            /// See: https://tools.ietf.org/html/rfc905
+            /// </summary>
+            /// <param name="stream">The socket to read from</param>
+            /// <returns>COTP DPDU instance</returns>
+            public static async Task<TPDU> ReadAsync(Stream stream, CancellationToken cancellationToken)
+            {
+                var tpkt = await TPKT.ReadAsync(stream, cancellationToken).ConfigureAwait(false);
+                if (tpkt.Length == 0)
+                {
+                    throw new TPDUInvalidException("No protocol data received");
+                }
+                return new TPDU(tpkt);
+            }
+
+            public override string ToString()
+            {
+                return string.Format("Length: {0} PDUType: {1} TPDUNumber: {2} Last: {3} Segment Data: {4}",
+                    HeaderLength,
+                    PDUType,
+                    TPDUNumber,
+                    LastDataUnit,
+                    BitConverter.ToString(Data)
+                    );
+            }
+
+        }
+
+        /// <summary>
+        /// Describes a COTP TSDU (Transport service data unit). One TSDU consist of 1 ore more TPDUs
+        /// </summary>
+        public class TSDU
+        {
+            /// <summary>
+            /// Reads the full COTP TSDU (Transport service data unit)
+            /// See: https://tools.ietf.org/html/rfc905
+            /// </summary>
+            /// <param name="stream">The stream to read from</param>
+            /// <returns>Data in TSDU</returns>
+            public static async Task<byte[]> ReadAsync(Stream stream, CancellationToken cancellationToken)
+            {
+                var segment = await TPDU.ReadAsync(stream, cancellationToken).ConfigureAwait(false);
+
+                if (segment.LastDataUnit)
+                {
+                    return segment.Data;
+                }
+
+                // More segments are expected, prepare a buffer to store all data
+                var buffer = new byte[segment.Data.Length];
+                Array.Copy(segment.Data, buffer, segment.Data.Length);
+
+                while (!segment.LastDataUnit)
+                {
+                    segment = await TPDU.ReadAsync(stream, cancellationToken).ConfigureAwait(false);
+                    var previousLength = buffer.Length;
+                    Array.Resize(ref buffer, buffer.Length + segment.Data.Length);
+                    Array.Copy(segment.Data, 0, buffer, previousLength, segment.Data.Length);
+                }
+
+                return buffer;
+            }
+        }
+    }
+}

常用工具集/Utility/Network/S7netplus/Compat/TcpClientMixins.cs

@@ -0,0 +1,9 @@
+using System.Net.Sockets;
+
+namespace S7.Net
+{
+    public static class TcpClientMixins
+    {
+        
+    }
+}

常用工具集/Utility/Network/S7netplus/Conversion.cs

@@ -0,0 +1,226 @@
+using System;
+using System.Globalization;
+
+namespace S7.Net
+{
+    /// <summary>
+    /// Conversion methods to convert from Siemens numeric format to C# and back
+    /// </summary>
+    public static class Conversion
+    {
+        /// <summary>
+        /// Converts a binary string to Int32 value
+        /// </summary>
+        /// <param name="txt"></param>
+        /// <returns></returns>
+        public static int BinStringToInt32(this string txt)
+        {
+            int ret = 0;
+
+            for (int i = 0; i < txt.Length; i++)
+            {
+                ret = (ret << 1) | ((txt[i] == '1') ? 1 : 0);
+            }
+            return ret;
+        }
+
+        /// <summary>
+        /// Converts a binary string to a byte. Can return null.
+        /// </summary>
+        /// <param name="txt"></param>
+        /// <returns></returns>
+        public static byte? BinStringToByte(this string txt)
+        {
+            if (txt.Length == 8) return (byte)BinStringToInt32(txt);
+            return null;
+        }
+
+        /// <summary>
+        /// Converts the value to a binary string
+        /// </summary>
+        /// <param name="value"></param>
+        /// <returns></returns>
+        public static string ValToBinString(this object value)
+        {
+            int cnt = 0;
+            int cnt2 = 0;
+            int x = 0;
+            string txt = "";
+            long longValue = 0;
+
+            try
+            {
+                if (value.GetType().Name.IndexOf("[]") < 0)
+                {
+                    // ist nur ein Wert
+                    switch (value.GetType().Name)
+                    {
+                        case "Byte":
+                            x = 7;
+                            longValue = (long)((byte)value);
+                            break;
+                        case "Int16":
+                            x = 15;
+                            longValue = (long)((Int16)value);
+                            break;
+                        case "Int32":
+                            x = 31;
+                            longValue = (long)((Int32)value);
+                            break;
+                        case "Int64":
+                            x = 63;
+                            longValue = (long)((Int64)value);
+                            break;
+                        default:
+                            throw new Exception();
+                    }
+
+                    for (cnt = x; cnt >= 0; cnt += -1)
+                    {
+                        if (((Int64)longValue & (Int64)Math.Pow(2, cnt)) > 0)
+                            txt += "1";
+                        else
+                            txt += "0";
+                    }
+                }
+                else
+                {
+                    // ist ein Array
+                    switch (value.GetType().Name)
+                    {
+                        case "Byte[]":
+                            x = 7;
+                            byte[] ByteArr = (byte[])value;
+                            for (cnt2 = 0; cnt2 <= ByteArr.Length - 1; cnt2++)
+                            {
+                                for (cnt = x; cnt >= 0; cnt += -1)
+                                    if ((ByteArr[cnt2] & (byte)Math.Pow(2, cnt)) > 0) txt += "1"; else txt += "0";
+                            }
+                            break;
+                        case "Int16[]":
+                            x = 15;
+                            Int16[] Int16Arr = (Int16[])value;
+                            for (cnt2 = 0; cnt2 <= Int16Arr.Length - 1; cnt2++)
+                            {
+                                for (cnt = x; cnt >= 0; cnt += -1)
+                                    if ((Int16Arr[cnt2] & (byte)Math.Pow(2, cnt)) > 0) txt += "1"; else txt += "0";
+                            }
+                            break;
+                        case "Int32[]":
+                            x = 31;
+                            Int32[] Int32Arr = (Int32[])value;
+                            for (cnt2 = 0; cnt2 <= Int32Arr.Length - 1; cnt2++)
+                            {
+                                for (cnt = x; cnt >= 0; cnt += -1)
+                                    if ((Int32Arr[cnt2] & (byte)Math.Pow(2, cnt)) > 0) txt += "1"; else txt += "0";
+                            }
+                            break;
+                        case "Int64[]":
+                            x = 63;
+                            byte[] Int64Arr = (byte[])value;
+                            for (cnt2 = 0; cnt2 <= Int64Arr.Length - 1; cnt2++)
+                            {
+                                for (cnt = x; cnt >= 0; cnt += -1)
+                                    if ((Int64Arr[cnt2] & (byte)Math.Pow(2, cnt)) > 0) txt += "1"; else txt += "0";
+                            }
+                            break;
+                        default:
+                            throw new Exception();
+                    }
+                }
+                return txt;
+            }
+            catch
+            {
+                return "";
+            }
+        }
+
+        /// <summary>
+        /// Helper to get a bit value given a byte and the bit index.
+        /// Example: DB1.DBX0.5 -> var bytes = ReadBytes(DB1.DBW0); bool bit = bytes[0].SelectBit(5); 
+        /// </summary>
+        /// <param name="data"></param>
+        /// <param name="bitPosition"></param>
+        /// <returns></returns>
+        public static bool SelectBit(this byte data, int bitPosition)
+        {
+            int mask = 1 << bitPosition;
+            int result = data & mask;
+
+            return (result != 0);
+        }
+
+        /// <summary>
+        /// Converts from ushort value to short value; it's used to retrieve negative values from words
+        /// </summary>
+        /// <param name="input"></param>
+        /// <returns></returns>
+        public static short ConvertToShort(this ushort input)
+        {
+            short output;
+            output = short.Parse(input.ToString("X"), NumberStyles.HexNumber);
+            return output;
+        }
+
+        /// <summary>
+        /// Converts from short value to ushort value; it's used to pass negative values to DWs
+        /// </summary>
+        /// <param name="input"></param>
+        /// <returns></returns>
+        public static ushort ConvertToUshort(this short input)
+        {
+            ushort output;
+            output = ushort.Parse(input.ToString("X"), NumberStyles.HexNumber);
+            return output;
+        }
+
+        /// <summary>
+        /// Converts from UInt32 value to Int32 value; it's used to retrieve negative values from DBDs
+        /// </summary>
+        /// <param name="input"></param>
+        /// <returns></returns>
+        public static Int32 ConvertToInt(this uint input)
+        {
+            int output;
+            output = int.Parse(input.ToString("X"), NumberStyles.HexNumber);
+            return output;
+        }
+
+        /// <summary>
+        /// Converts from Int32 value to UInt32 value; it's used to pass negative values to DBDs
+        /// </summary>
+        /// <param name="input"></param>
+        /// <returns></returns>
+        public static UInt32 ConvertToUInt(this int input)
+        {
+            uint output;
+            output = uint.Parse(input.ToString("X"), NumberStyles.HexNumber);
+            return output;
+        }
+
+        /// <summary>
+        /// Converts from float to DWord (DBD)
+        /// </summary>
+        /// <param name="input"></param>
+        /// <returns></returns>
+        public static UInt32 ConvertToUInt(this float input)
+        {
+            uint output;
+            output = S7.Net.Types.DWord.FromByteArray(S7.Net.Types.Real.ToByteArray(input));
+            return output;
+        }
+
+        /// <summary>
+        /// Converts from DWord (DBD) to float
+        /// </summary>
+        /// <param name="input"></param>
+        /// <returns></returns>
+        public static float ConvertToFloat(this uint input)
+        {
+            float output;
+            output = S7.Net.Types.Real.FromByteArray(S7.Net.Types.DWord.ToByteArray(input));
+            return output;
+        }
+    }
+}

常用工具集/Utility/Network/S7netplus/Enums.cs

@@ -0,0 +1,211 @@
+namespace S7.Net
+{
+    /// <summary>
+    /// Types of S7 cpu supported by the library
+    /// </summary>
+    public enum CpuType
+    {
+        /// <summary>
+        /// S7 200 cpu type
+        /// </summary>
+        S7200 = 0,
+
+        /// <summary>
+        /// Siemens Logo 0BA8
+        /// </summary>
+        Logo0BA8 = 1,
+
+        /// <summary>
+        /// S7 200 Smart
+        /// </summary>
+        S7200Smart = 2,
+
+        /// <summary>
+        /// S7 300 cpu type
+        /// </summary>
+        S7300 = 10,
+
+        /// <summary>
+        /// S7 400 cpu type
+        /// </summary>
+        S7400 = 20,
+
+        /// <summary>
+        /// S7 1200 cpu type
+        /// </summary>
+        S71200 = 30,
+
+        /// <summary>
+        /// S7 1500 cpu type
+        /// </summary>
+        S71500 = 40,
+    }
+
+    /// <summary>
+    /// Types of error code that can be set after a function is called
+    /// </summary>
+    public enum ErrorCode
+    {
+        /// <summary>
+        /// The function has been executed correctly
+        /// </summary>
+        NoError = 0,
+
+        /// <summary>
+        /// Wrong type of CPU error
+        /// </summary>
+        WrongCPU_Type = 1,
+
+        /// <summary>
+        /// Connection error
+        /// </summary>
+        ConnectionError = 2,
+
+        /// <summary>
+        /// Ip address not available
+        /// </summary>
+        IPAddressNotAvailable,
+
+        /// <summary>
+        /// Wrong format of the variable
+        /// </summary>
+        WrongVarFormat = 10,
+
+        /// <summary>
+        /// Wrong number of received bytes
+        /// </summary>
+        WrongNumberReceivedBytes = 11,
+
+        /// <summary>
+        /// Error on send data
+        /// </summary>
+        SendData = 20,
+
+        /// <summary>
+        /// Error on read data
+        /// </summary>
+        ReadData = 30,
+
+        /// <summary>
+        /// Error on write data
+        /// </summary>
+        WriteData = 50
+    }
+
+    /// <summary>
+    /// Types of memory area that can be read
+    /// </summary>
+    public enum DataType
+    {
+        /// <summary>
+        /// Input area memory
+        /// </summary>
+        Input = 129,
+
+        /// <summary>
+        /// Output area memory
+        /// </summary>
+        Output = 130,
+
+        /// <summary>
+        /// Merkers area memory (M0, M0.0, ...)
+        /// </summary>
+        Memory = 131,
+
+        /// <summary>
+        /// DB area memory (DB1, DB2, ...)
+        /// </summary>
+        DataBlock = 132,
+
+        /// <summary>
+        /// Timer area memory(T1, T2, ...)
+        /// </summary>
+        Timer = 29,
+
+        /// <summary>
+        /// Counter area memory (C1, C2, ...)
+        /// </summary>
+        Counter = 28
+    }
+
+    /// <summary>
+    /// Types
+    /// </summary>
+    public enum VarType
+    {
+        /// <summary>
+        /// S7 Bit variable type (bool)
+        /// </summary>
+        Bit,
+
+        /// <summary>
+        /// S7 Byte variable type (8 bits)
+        /// </summary>
+        Byte,
+
+        /// <summary>
+        /// S7 Word variable type (16 bits, 2 bytes)
+        /// </summary>
+        Word,
+
+        /// <summary>
+        /// S7 DWord variable type (32 bits, 4 bytes)
+        /// </summary>
+        DWord,
+
+        /// <summary>
+        /// S7 Int variable type (16 bits, 2 bytes)
+        /// </summary>
+        Int,
+
+        /// <summary>
+        /// DInt variable type (32 bits, 4 bytes)
+        /// </summary>
+        DInt,
+
+        /// <summary>
+        /// Real variable type (32 bits, 4 bytes)
+        /// </summary>
+        Real,
+
+        /// <summary>
+        /// LReal variable type (64 bits, 8 bytes)
+        /// </summary>
+        LReal,
+
+        /// <summary>
+        /// Char Array / C-String variable type (variable)
+        /// </summary>
+        String,
+
+        /// <summary>
+        /// S7 String variable type (variable)
+        /// </summary>
+        S7String,
+
+        /// <summary>
+        /// S7 WString variable type (variable)
+        /// </summary>
+        S7WString,
+
+        /// <summary>
+        /// Timer variable type
+        /// </summary>
+        Timer,
+
+        /// <summary>
+        /// Counter variable type
+        /// </summary>
+        Counter,
+
+        /// <summary>
+        /// DateTIme variable type
+        /// </summary>
+        DateTime,
+
+        /// <summary>
+        /// DateTimeLong variable type
+        /// </summary>
+        DateTimeLong
+    }
+}

常用工具集/Utility/Network/S7netplus/Helper/MemoryStreamExtension.cs

@@ -0,0 +1,35 @@
+using System.IO;
+
+namespace S7.Net.Helper
+{
+    internal static class MemoryStreamExtension
+    {
+        /// <summary>
+        /// Helper function to write to whole content of the given byte array to a memory stream.
+        /// 
+        /// Writes all bytes in value from 0 to value.Length to the memory stream.
+        /// </summary>
+        /// <param name="stream"></param>
+        /// <param name="value"></param>
+        public static void Write(this MemoryStream stream, byte[] value)
+        {
+            stream.Write(value, 0, value.Length);
+        }
+
+        /// <summary>
+        /// Helper function to write the whole content of the given byte span to a memory stream.
+        /// </summary>
+        /// <param name="stream"></param>
+        /// <param name="value"></param>
+        //public static void Write(this MemoryStream stream, ReadOnlySpan<byte> value)
+        //{
+        //    byte[] buffer = ArrayPool<byte>.Shared.Rent(value.Length);
+
+        //    value.CopyTo(buffer);
+        //    stream.Write(buffer, 0, value.Length);
+
+        //    ArrayPool<byte>.Shared.Return(buffer);
+        //}
+    }
+
+}

常用工具集/Utility/Network/S7netplus/Internal/TaskQueue.cs

@@ -0,0 +1,28 @@
+using System;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace S7.Net.Internal
+{
+    internal class TaskQueue
+    {
+        private static readonly object Sentinel = new object();
+
+        private Task prev = Task.FromResult(Sentinel);
+
+        public async Task<T> Enqueue<T>(Func<Task<T>> action)
+        {
+            var tcs = new TaskCompletionSource<object>();
+            await Interlocked.Exchange(ref prev, tcs.Task).ConfigureAwait(false);
+
+            try
+            {
+                return await action.Invoke().ConfigureAwait(false);
+            }
+            finally
+            {
+                tcs.SetResult(Sentinel);
+            }
+        }
+    }
+}

常用工具集/Utility/Network/S7netplus/InvalidDataException.cs

@@ -0,0 +1,39 @@
+using System;
+
+namespace S7.Net
+{
+    [Serializable]
+    public class InvalidDataException : Exception
+    {
+        public byte[] ReceivedData { get; }
+        public int ErrorIndex { get; }
+        public byte ExpectedValue { get; }
+
+        public InvalidDataException(string message, byte[] receivedData, int errorIndex, byte expectedValue)
+            : base(FormatMessage(message, receivedData, errorIndex, expectedValue))
+        {
+            ReceivedData = receivedData;
+            ErrorIndex = errorIndex;
+            ExpectedValue = expectedValue;
+        }
+
+        protected InvalidDataException(System.Runtime.Serialization.SerializationInfo info,
+            System.Runtime.Serialization.StreamingContext context) : base(info, context)
+        {
+            ReceivedData = (byte[])info.GetValue(nameof(ReceivedData), typeof(byte[]));
+            ErrorIndex = info.GetInt32(nameof(ErrorIndex));
+            ExpectedValue = info.GetByte(nameof(ExpectedValue));
+        }
+
+        private static string FormatMessage(string message, byte[] receivedData, int errorIndex, byte expectedValue)
+        {
+            if (errorIndex >= receivedData.Length)
+                throw new ArgumentOutOfRangeException(nameof(errorIndex),
+                    $"{nameof(errorIndex)} {errorIndex} is outside the bounds of {nameof(receivedData)} with length {receivedData.Length}.");
+
+            return $"{message} Invalid data received. Expected '{expectedValue}' at index {errorIndex}, " +
+                $"but received {receivedData[errorIndex]}. See the {nameof(ReceivedData)} property " +
+                "for the full message received.";
+        }
+    }
+}

常用工具集/Utility/Network/S7netplus/ORM/S7Client.cs

@@ -0,0 +1,47 @@
+using System;
+using S7.Net;
+
+namespace MES.Utility.Network.S7netplus.ORM
+{
+    public class S7Client : IDisposable
+    {
+        public S7Helper Plc;
+        public bool IsConnected;
+        public S7Client(CpuType cpu, string ip)
+        {
+            try
+            {
+                Plc = new S7Helper(cpu, ip);
+                IsConnected = true;
+            }
+            catch (Exception ex)
+            {
+                IsConnected = false;
+            }
+        }
+
+        public S7Read<T> Readable<T>() where T : class, new()
+        {
+            return new S7Read<T>(this);
+        }
+
+        public S7Write<T> Writeable<T>(T entity) where T : class, new()
+        {
+            return new S7Write<T>(this, entity);
+        }
+
+        public void Dispose()
+        {
+            try
+            {
+                if (Plc != null)
+                {
+                    Plc.Dispose();
+                    Plc = null;
+                }
+
+            }
+            catch { }
+        }
+    }
+}

常用工具集/Utility/Network/S7netplus/ORM/S7NodeType.cs

@@ -0,0 +1,19 @@
+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace MES.Utility.Network.S7netplus.ORM
+{
+    public enum S7NodeType
+    {
+        [Description("可读可写")]
+        ReadAndWrite,
+        [Description("只读")]
+        ReadOnly,
+        [Description("只写")]
+        WriteOnly
+    }
+}

常用工具集/Utility/Network/S7netplus/ORM/S7PLCAttribute.cs

@@ -0,0 +1,29 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using MES.Utility.Network.S7netplus.ORM;
+
+namespace MES.Utility.Network.S7netplus.ORM
+{
+    public class S7PLCAttribute : Attribute
+    {
+        public string Address { get; set; }
+        public int StrLength { get; set; }
+        public S7NodeType Type { get; set; }
+        public S7PLCAttribute() { }
+
+        public S7PLCAttribute(string address, S7NodeType type)
+        {
+            this.Address = address;
+            this.Type = type;
+        }
+        public S7PLCAttribute(string address, int strLength, S7NodeType type)
+        {
+            this.Address = address;
+            this.StrLength = strLength;
+            this.Type = type;
+        }
+    }
+}

常用工具集/Utility/Network/S7netplus/ORM/S7Read.cs

@@ -0,0 +1,187 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Linq.Expressions;
+using System.Reflection;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace MES.Utility.Network.S7netplus.ORM
+{
+    public class S7Read<T> where T : class, new()
+    {
+        private S7Client opcClient;
+        private Dictionary<string, PropertyInfo> fieldDict;
+        private Dictionary<string, int> stringLengthDict;
+        /// <summary>
+        /// 构造方法，传入参数
+        /// </summary>
+        /// <param name="opcClient"></param>
+        public S7Read(S7Client opcClient)
+        {
+            this.opcClient = opcClient;
+            //默认取出所有的只读或者可读可写的属性
+            GetNodeType(out fieldDict, out stringLengthDict);
+        }
+
+        /// <summary>
+        /// 获得所有具有可读属性的数据
+        /// </summary>
+        /// <returns></returns>
+        private void GetNodeType(out Dictionary<string, PropertyInfo> fieldDict, out Dictionary<string, int> stringLengthDict)
+        {
+            fieldDict = new Dictionary<string, PropertyInfo>();
+            stringLengthDict = new Dictionary<string, int>();
+
+            //获得对象T的属性
+            PropertyInfo[] properties = typeof(T).GetProperties();
+            //得到所有添加注解的属性
+            foreach (PropertyInfo info in properties)
+            {
+                //判断是否具有HttpController属性
+                Object[] attr = info.GetCustomAttributes(false);
+                if (attr.Length == 0)
+                {
+                    continue;
+                }
+                //从注解数组中取第一个注解(一个属性可以包含多个注解)
+                S7PLCAttribute myattr = attr[0] as S7PLCAttribute;
+                if (myattr == null)
+                    continue;
+                if (myattr.Type == S7NodeType.ReadAndWrite || myattr.Type == S7NodeType.ReadOnly)
+                {
+                    fieldDict.Add(myattr.Address, info);
+                    stringLengthDict.Add(myattr.Address, myattr.StrLength);
+                }
+            }
+        }
+
+        /// <summary>
+        /// 执行获得数据，映射成对象
+        /// </summary>
+        /// <param name="message">返回错误信息</param>
+        /// <returns></returns>
+        public bool Execute(out T t)
+        {
+
+            if (fieldDict.Count == 0)
+            {
+                t = default(T);
+                return false;
+            }
+            try
+            {
+                if (!opcClient.IsConnected)
+                {
+                    t = default(T);
+                    return false;
+                }
+                bool flag = false;
+                T entity = (T)Activator.CreateInstance(typeof(T));
+                //循环读取每一个
+                foreach (KeyValuePair<string, PropertyInfo> keyValue in fieldDict)
+                {
+                    //判断当前keyValue是什么类型
+                    if (keyValue.Value.PropertyType == typeof(ushort))
+                    {
+                        ushort value=0;
+                        flag = opcClient.Plc.ReadInt16(keyValue.Key, out value);
+                        if (!flag)
+                        {
+                            t = default(T);
+                            return false;
+                        }
+                        keyValue.Value.SetValue(entity, value);
+                    }
+                    else if (keyValue.Value.PropertyType == typeof(int))
+                    {
+                        ushort value =0;
+                        flag = opcClient.Plc.ReadInt16(keyValue.Key, out value);
+                        if (!flag)
+                        {
+                            t = default(T);
+                            return false;
+                        }
+                        keyValue.Value.SetValue(entity, value);
+                    }
+                    //else if (keyValue.Value.PropertyType == typeof(float))
+                    //{
+                    //    float value;
+                    //    flag = opcClient.Plc.ReadReal(keyValue.Key, out value);
+                    //    if (!flag)
+                    //    {
+                    //        t = default(T);
+                    //        return false;
+                    //    }
+                    //    keyValue.Value.SetValue(entity, value);
+                    //}
+                    else if (keyValue.Value.PropertyType == typeof(string))
+                    {
+                        string value;
+                        flag = opcClient.Plc.ReadString(keyValue.Key, stringLengthDict[keyValue.Key], out value);
+                        if (!flag)
+                        {
+                            t = default(T);
+                            return false;
+                        }
+                        keyValue.Value.SetValue(entity, value);
+                    }
+                }
+                t = entity;
+                return true;
+            }
+            catch
+            {
+                t = default(T);
+                return false;
+            }
+        }
+
+
+        /// <summary>
+        /// 传入Lambda表达式，指定读取的数据
+        /// </summary>
+        /// <param name="columns"></param>
+        /// <returns></returns>
+        public S7Read<T> ReadField(Expression<Func<T, object>> columns)
+        {
+            Dictionary<string, PropertyInfo> fieldDict = new Dictionary<string, PropertyInfo>();
+            Dictionary<string, int> stringLengthDict = new Dictionary<string, int>();
+
+            //取出要读的属性
+            string lambda = columns.Body.ToString();
+            int index1 = lambda.IndexOf('(');
+            int index2 = lambda.IndexOf(')');
+            string str = lambda.Substring(index1 + 1, index2 - index1 - 1);
+            List<string> keyList = str.Split(',').Select(it => it.Split('=')[0].Trim()).ToList();
+            fieldDict.Clear();
+            //获得对象T的属性
+            PropertyInfo[] properties = typeof(T).GetProperties();
+            //得到所有添加注解的属性
+            foreach (PropertyInfo info in properties)
+            {
+                //判断是否具有HttpController属性
+                Object[] attr = info.GetCustomAttributes(false);
+                if (attr.Length == 0)
+                {
+                    continue;
+                }
+                //从注解数组中取第一个注解(一个属性可以包含多个注解)
+                S7PLCAttribute myattr = attr[0] as S7PLCAttribute;
+                if (myattr == null)
+                    continue;
+                if (myattr.Type == S7NodeType.ReadAndWrite || myattr.Type == S7NodeType.ReadOnly)
+                {
+                    if (keyList.Contains(info.Name))
+                    {
+                        fieldDict.Add(myattr.Address, info);
+                        stringLengthDict.Add(myattr.Address, myattr.StrLength);
+                    }
+                }
+            }
+            this.fieldDict = fieldDict;
+            this.stringLengthDict = stringLengthDict;
+            return this;
+        }
+    }
+}

常用工具集/Utility/Network/S7netplus/ORM/S7Write.cs

@@ -0,0 +1,176 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Linq.Expressions;
+using System.Reflection;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace MES.Utility.Network.S7netplus.ORM
+{
+    public class S7Write<T> where T : class, new()
+    {
+        private S7Client opcClient;
+        private T entity;
+        private Dictionary<string, PropertyInfo> dict;
+        private Dictionary<string, int> strLengthDict;
+
+        /// <summary>
+        /// 构造方法，传入参数
+        /// </summary>
+        /// <param name="opcClient"></param>
+        /// <param name="entity"></param>
+        public S7Write(S7Client opcClient, T entity)
+        {
+            this.opcClient = opcClient;
+            this.entity = entity;
+            //默认取出所有的只写或者可读可写的属性
+            GetAllKeyList(out dict, out strLengthDict);
+        }
+
+
+        /// <summary>
+        /// 获得所有具有可写属性的数据
+        /// </summary>
+        /// <returns></returns>
+        private void GetAllKeyList(out Dictionary<string, PropertyInfo> dict, out Dictionary<string, int> strLengthDict)
+        {
+            dict = new Dictionary<string, PropertyInfo>();
+            strLengthDict = new Dictionary<string, int>();
+
+
+            //获取entity对象的所有属性
+            PropertyInfo[] properties = typeof(T).GetProperties();
+            //得到所有添加注解的属性
+            foreach (PropertyInfo info in properties)
+            {
+                //判断是否具有HttpController属性
+                object[] attr = info.GetCustomAttributes(false);
+                if (attr.Length == 0)
+                {
+                    continue;
+                }
+                //从注解数组中取第一个注解(一个属性可以包含多个注解)
+                S7PLCAttribute myattr = attr[0] as S7PLCAttribute;
+                if (myattr == null)
+                    continue;
+                if (myattr.Type == S7NodeType.ReadAndWrite || myattr.Type == S7NodeType.WriteOnly)
+                {
+                    dict.Add(myattr.Address, info);
+                    strLengthDict.Add(myattr.Address, myattr.StrLength);
+                }
+            }
+        }
+
+        /// <summary>
+        ///  执行写入数据，将对象中的数据写入到OPC服务中
+        /// </summary>
+        /// <param name="message">返回写入过程中出现的错误信息</param>
+        /// <returns></returns>
+        public bool Execute()
+        {
+            if (dict.Count == 0)
+            {
+                return false;
+            }
+            if (!opcClient.IsConnected)
+                return false;
+            //循环写入
+            try
+            {
+                bool flag;
+                foreach (KeyValuePair<string, PropertyInfo> keyValue in dict)
+                {
+                    //判断当前keyValue是什么类型
+                    if (keyValue.Value.PropertyType == typeof(ushort))
+                    {
+                        flag = opcClient.Plc.WriteInt16(keyValue.Key, (ushort)keyValue.Value.GetValue(entity));
+                        if (!flag)
+                        {
+                            return false;
+                        }
+                    }
+                    else if (keyValue.Value.PropertyType == typeof(int))
+                    {
+                        flag = opcClient.Plc.WriteInt32(keyValue.Key, (int)keyValue.Value.GetValue(entity));
+                        if (!flag)
+                        {
+                            return false;
+                        }
+                    }
+                    else if (keyValue.Value.PropertyType == typeof(float))
+                    {
+                        flag = opcClient.Plc.WriteSingle(keyValue.Key, (float)keyValue.Value.GetValue(entity));
+                        if (!flag)
+                        {
+                            return false;
+                        }
+                    }
+                    else if (keyValue.Value.PropertyType == typeof(string))
+                    {
+                        flag = opcClient.Plc.WriteString(keyValue.Key, (string)keyValue.Value.GetValue(entity), strLengthDict[keyValue.Key]);
+                        if (!flag)
+                        {
+                            return false;
+                        }
+                    }
+
+                }
+                return true;
+            }
+            catch
+            {
+                return false;
+            }
+
+        }
+
+
+        /// <summary>
+        /// 传入Lambda表达式，指定写入的数据
+        /// </summary>
+        /// <param name="columns"></param>
+        /// <returns></returns>
+        public S7Write<T> WriteField(Expression<Func<T, object>> columns)
+        {
+            Dictionary<string, PropertyInfo> dict = new Dictionary<string, PropertyInfo>();
+            Dictionary<string, int> strLengthDict = new Dictionary<string, int>();
+
+
+            string lambda = columns.Body.ToString();
+            int index1 = lambda.IndexOf('(');
+            int index2 = lambda.IndexOf(')');
+            string str = lambda.Substring(index1 + 1, index2 - index1 - 1);
+            List<string> keyList = str.Split(',').Select(it => it.Split('=')[0].Trim()).ToList();
+
+            //获取entity对象的所有属性
+            PropertyInfo[] properties = typeof(T).GetProperties();
+            //得到所有添加注解的属性
+            foreach (PropertyInfo info in properties)
+            {
+                //判断是否具有HttpController属性
+                Object[] attr = info.GetCustomAttributes(false);
+                if (attr.Length == 0)
+                {
+                    continue;
+                }
+                //从注解数组中取第一个注解(一个属性可以包含多个注解)
+                S7PLCAttribute myattr = attr[0] as S7PLCAttribute;
+                if (myattr == null)
+                    continue;
+                if (myattr.Type == S7NodeType.ReadAndWrite || myattr.Type == S7NodeType.WriteOnly)
+                {
+                    string name = info.Name;
+                    if (keyList.Contains(name))
+                    {
+                        dict.Add(myattr.Address, info);
+                        strLengthDict.Add(myattr.Address, myattr.StrLength);
+                    }
+                }
+            }
+            this.dict = dict;
+            this.strLengthDict = strLengthDict;
+            return this;
+        }
+    }
+}

常用工具集/Utility/Network/S7netplus/PLC.cs

@@ -0,0 +1,329 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Net.Sockets;
+using S7.Net.Internal;
+using S7.Net.Protocol;
+using S7.Net.Types;
+
+
+namespace S7.Net
+{
+    /// <summary>
+    /// Creates an instance of S7.Net driver
+    /// </summary>
+    public partial class Plc : IDisposable
+    {
+        /// <summary>
+        /// The default port for the S7 protocol.
+        /// </summary>
+        public const int DefaultPort = 102;
+
+        /// <summary>
+        /// The default timeout (in milliseconds) used for <see cref="P:ReadTimeout"/> and <see cref="P:WriteTimeout"/>.
+        /// </summary>
+        public const int DefaultTimeout = 10_000;
+
+        private readonly TaskQueue queue = new TaskQueue();
+
+        //TCP connection to device
+        private TcpClient tcpClient;
+        private NetworkStream _stream;
+
+        private int readTimeout = DefaultTimeout; // default no timeout
+        private int writeTimeout = DefaultTimeout; // default no timeout
+
+        /// <summary>
+        /// IP address of the PLC
+        /// </summary>
+        public string IP { get; }
+
+        /// <summary>
+        /// PORT Number of the PLC, default is 102
+        /// </summary>
+        public int Port { get; }
+
+        /// <summary>
+        /// The TSAP addresses used during the connection request.
+        /// </summary>
+        public TsapPair TsapPair { get; set; }
+
+        /// <summary>
+        /// CPU type of the PLC
+        /// </summary>
+        public CpuType CPU { get; }
+
+        /// <summary>
+        /// Rack of the PLC
+        /// </summary>
+        public Int16 Rack { get; }
+
+        /// <summary>
+        /// Slot of the CPU of the PLC
+        /// </summary>
+        public Int16 Slot { get; }
+
+        /// <summary>
+        /// Max PDU size this cpu supports
+        /// </summary>
+        public int MaxPDUSize { get; private set; }
+
+        /// <summary>Gets or sets the amount of time that a read operation blocks waiting for data from PLC.</summary>
+        /// <returns>A <see cref="T:System.Int32" /> that specifies the amount of time, in milliseconds, that will elapse before a read operation fails. The default value, <see cref="F:System.Threading.Timeout.Infinite" />, specifies that the read operation does not time out.</returns>
+        public int ReadTimeout
+        {
+            get => readTimeout;
+            set
+            {
+                readTimeout = value;
+                if (tcpClient != null) tcpClient.ReceiveTimeout = readTimeout;
+            }
+        }
+
+        /// <summary>Gets or sets the amount of time that a write operation blocks waiting for data to PLC. </summary>
+        /// <returns>A <see cref="T:System.Int32" /> that specifies the amount of time, in milliseconds, that will elapse before a write operation fails. The default value, <see cref="F:System.Threading.Timeout.Infinite" />, specifies that the write operation does not time out.</returns>
+        public int WriteTimeout
+        {
+            get => writeTimeout;
+            set
+            {
+                writeTimeout = value;
+                if (tcpClient != null) tcpClient.SendTimeout = writeTimeout;
+            }
+        }
+
+        /// <summary>
+        /// Gets a value indicating whether a connection to the PLC has been established.
+        /// </summary>
+        /// <remarks>
+        /// The <see cref="IsConnected"/> property gets the connection state of the Client socket as
+        /// of the last I/O operation. When it returns <c>false</c>, the Client socket was either
+        /// never  connected, or is no longer connected.
+        ///
+        /// <para>
+        /// Because the <see cref="IsConnected"/> property only reflects the state of the connection
+        /// as of the most recent operation, you should attempt to send or receive a message to
+        /// determine the current state. After the message send fails, this property no longer
+        /// returns <c>true</c>. Note that this behavior is by design. You cannot reliably test the
+        /// state of the connection because, in the time between the test and a send/receive, the
+        /// connection could have been lost. Your code should assume the socket is connected, and
+        /// gracefully handle failed transmissions.
+        /// </para>
+        /// </remarks>
+        public bool IsConnected => tcpClient?.Connected ?? false;
+
+        /// <summary>
+        /// Creates a PLC object with all the parameters needed for connections.
+        /// For S7-1200 and S7-1500, the default is rack = 0 and slot = 0.
+        /// You need slot > 0 if you are connecting to external ethernet card (CP).
+        /// For S7-300 and S7-400 the default is rack = 0 and slot = 2.
+        /// </summary>
+        /// <param name="cpu">CpuType of the PLC (select from the enum)</param>
+        /// <param name="ip">Ip address of the PLC</param>
+        /// <param name="rack">rack of the PLC, usually it's 0, but check in the hardware configuration of Step7 or TIA portal</param>
+        /// <param name="slot">slot of the CPU of the PLC, usually it's 2 for S7300-S7400, 0 for S7-1200 and S7-1500.
+        ///  If you use an external ethernet card, this must be set accordingly.</param>
+        public Plc(CpuType cpu, string ip, Int16 rack, Int16 slot)
+            : this(cpu, ip, DefaultPort, rack, slot)
+        {
+        }
+
+        /// <summary>
+        /// Creates a PLC object with all the parameters needed for connections.
+        /// For S7-1200 and S7-1500, the default is rack = 0 and slot = 0.
+        /// You need slot > 0 if you are connecting to external ethernet card (CP).
+        /// For S7-300 and S7-400 the default is rack = 0 and slot = 2.
+        /// </summary>
+        /// <param name="cpu">CpuType of the PLC (select from the enum)</param>
+        /// <param name="ip">Ip address of the PLC</param>
+        /// <param name="port">Port number used for the connection, default 102.</param>
+        /// <param name="rack">rack of the PLC, usually it's 0, but check in the hardware configuration of Step7 or TIA portal</param>
+        /// <param name="slot">slot of the CPU of the PLC, usually it's 2 for S7300-S7400, 0 for S7-1200 and S7-1500.
+        ///  If you use an external ethernet card, this must be set accordingly.</param>
+        public Plc(CpuType cpu, string ip, int port, Int16 rack, Int16 slot)
+            : this(ip, port, TsapPair.GetDefaultTsapPair(cpu, rack, slot))
+        {
+            if (!Enum.IsDefined(typeof(CpuType), cpu))
+                throw new ArgumentException(
+                    $"The value of argument '{nameof(cpu)}' ({cpu}) is invalid for Enum type '{typeof(CpuType).Name}'.",
+                    nameof(cpu));
+
+            CPU = cpu;
+            Rack = rack;
+            Slot = slot;
+        }
+
+        /// <summary>
+        /// Creates a PLC object with all the parameters needed for connections.
+        /// For S7-1200 and S7-1500, the default is rack = 0 and slot = 0.
+        /// You need slot > 0 if you are connecting to external ethernet card (CP).
+        /// For S7-300 and S7-400 the default is rack = 0 and slot = 2.
+        /// </summary>
+        /// <param name="ip">Ip address of the PLC</param>
+        /// <param name="tsapPair">The TSAP addresses used for the connection request.</param>
+        public Plc(string ip, TsapPair tsapPair) : this(ip, DefaultPort, tsapPair)
+        {
+        }
+
+        /// <summary>
+        /// Creates a PLC object with all the parameters needed for connections. Use this constructor
+        /// if you want to manually override the TSAP addresses used during the connection request.
+        /// </summary>
+        /// <param name="ip">Ip address of the PLC</param>
+        /// <param name="port">Port number used for the connection, default 102.</param>
+        /// <param name="tsapPair">The TSAP addresses used for the connection request.</param>
+        public Plc(string ip, int port, TsapPair tsapPair)
+        {
+            if (string.IsNullOrEmpty(ip))
+                throw new ArgumentException("IP address must valid.", nameof(ip));
+
+            IP = ip;
+            Port = port;
+            MaxPDUSize = 240;
+            TsapPair = tsapPair;
+        }
+
+        /// <summary>
+        /// Close connection to PLC
+        /// </summary>
+        public void Close()
+        {
+            if (tcpClient != null)
+            {
+                if (tcpClient.Connected) tcpClient.Close();
+                tcpClient = null; // Can not reuse TcpClient once connection gets closed.
+            }
+        }
+
+        private void AssertPduSizeForRead(ICollection<DataItem> dataItems)
+        {
+            // send request limit: 19 bytes of header data, 12 bytes of parameter data for each dataItem
+            var requiredRequestSize = 19 + dataItems.Count * 12;
+            if (requiredRequestSize > MaxPDUSize) throw new Exception($"Too many vars requested for read. Request size ({requiredRequestSize}) is larger than protocol limit ({MaxPDUSize}).");
+
+            // response limit: 14 bytes of header data, 4 bytes of result data for each dataItem and the actual data
+            var requiredResponseSize = GetDataLength(dataItems) + dataItems.Count * 4 + 14;
+            if (requiredResponseSize > MaxPDUSize) throw new Exception($"Too much data requested for read. Response size ({requiredResponseSize}) is larger than protocol limit ({MaxPDUSize}).");
+        }
+
+        private void AssertPduSizeForWrite(ICollection<DataItem> dataItems)
+        {
+            // 12 bytes of header data, 18 bytes of parameter data for each dataItem
+            if (dataItems.Count * 18 + 12 > MaxPDUSize) throw new Exception("Too many vars supplied for write");
+
+            // 12 bytes of header data, 16 bytes of data for each dataItem and the actual data
+            if (GetDataLength(dataItems) + dataItems.Count * 16 + 12 > MaxPDUSize)
+                throw new Exception("Too much data supplied for write");
+        }
+
+        private void ConfigureConnection()
+        {
+            if (tcpClient == null)
+            {
+                return;
+            }
+            tcpClient.ReceiveTimeout = ReadTimeout;
+            tcpClient.SendTimeout = WriteTimeout;
+        }
+
+        private int GetDataLength(IEnumerable<DataItem> dataItems)
+        {
+            // Odd length variables are 0-padded
+            return dataItems.Select(di => VarTypeToByteLength(di.VarType, di.Count))
+                .Sum(len => (len & 1) == 1 ? len + 1 : len);
+        }
+
+        private static void AssertReadResponse(byte[] s7Data, int dataLength)
+        {
+            var expectedLength = dataLength + 18;
+
+            PlcException NotEnoughBytes() =>
+                new PlcException(ErrorCode.WrongNumberReceivedBytes,
+                    $"Received {s7Data.Length} bytes: '{BitConverter.ToString(s7Data)}', expected {expectedLength} bytes.")
+            ;
+
+            if (s7Data == null)
+                throw new PlcException(ErrorCode.WrongNumberReceivedBytes, "No s7Data received.");
+
+            if (s7Data.Length < 15) throw NotEnoughBytes();
+
+            ValidateResponseCode((ReadWriteErrorCode)s7Data[14]);
+
+            if (s7Data.Length < expectedLength) throw NotEnoughBytes();
+        }
+
+        internal static void ValidateResponseCode(ReadWriteErrorCode statusCode)
+        {
+            switch (statusCode)
+            {
+                case ReadWriteErrorCode.ObjectDoesNotExist:
+                    throw new Exception("Received error from PLC: Object does not exist.");
+                case ReadWriteErrorCode.DataTypeInconsistent:
+                    throw new Exception("Received error from PLC: Data type inconsistent.");
+                case ReadWriteErrorCode.DataTypeNotSupported:
+                    throw new Exception("Received error from PLC: Data type not supported.");
+                case ReadWriteErrorCode.AccessingObjectNotAllowed:
+                    throw new Exception("Received error from PLC: Accessing object not allowed.");
+                case ReadWriteErrorCode.AddressOutOfRange:
+                    throw new Exception("Received error from PLC: Address out of range.");
+                case ReadWriteErrorCode.HardwareFault:
+                    throw new Exception("Received error from PLC: Hardware fault.");
+                case ReadWriteErrorCode.Success:
+                    break;
+                default:
+                    throw new Exception($"Invalid response from PLC: statusCode={(byte)statusCode}.");
+            }
+        }
+
+        private Stream GetStreamIfAvailable()
+        {
+            if (_stream == null)
+            {
+                throw new PlcException(ErrorCode.ConnectionError, "Plc is not connected");
+            }
+
+            return _stream;
+        }
+
+        #region IDisposable Support
+        private bool disposedValue = false; // To detect redundant calls
+
+        /// <summary>
+        /// Dispose Plc Object
+        /// </summary>
+        /// <param name="disposing"></param>
+        protected virtual void Dispose(bool disposing)
+        {
+            if (!disposedValue)
+            {
+                if (disposing)
+                {
+                    Close();
+                }
+
+                // TODO: free unmanaged resources (unmanaged objects) and override a finalizer below.
+                // TODO: set large fields to null.
+
+                disposedValue = true;
+            }
+        }
+
+        // TODO: override a finalizer only if Dispose(bool disposing) above has code to free unmanaged resources.
+        // ~Plc() {
+        //   // Do not change this code. Put cleanup code in Dispose(bool disposing) above.
+        //   Dispose(false);
+        // }
+
+        // This code added to correctly implement the disposable pattern.
+        void IDisposable.Dispose()
+        {
+            // Do not change this code. Put cleanup code in Dispose(bool disposing) above.
+            Dispose(true);
+            // TODO: uncomment the following line if the finalizer is overridden above.
+            // GC.SuppressFinalize(this);
+        }
+        #endregion
+
+    }
+}

常用工具集/Utility/Network/S7netplus/PLCAddress.cs

@@ -0,0 +1,207 @@
+namespace S7.Net
+{
+    internal class PLCAddress
+    {
+        private DataType dataType;
+        private int dbNumber;
+        private int startByte;
+        private int bitNumber;
+        private VarType varType;
+
+        public DataType DataType
+        {
+            get => dataType;
+            set => dataType = value;
+        }
+
+        public int DbNumber
+        {
+            get => dbNumber;
+            set => dbNumber = value;
+        }
+
+        public int StartByte
+        {
+            get => startByte;
+            set => startByte = value;
+        }
+
+        public int BitNumber
+        {
+            get => bitNumber;
+            set => bitNumber = value;
+        }
+
+        public VarType VarType
+        {
+            get => varType;
+            set => varType = value;
+        }
+
+        public PLCAddress(string address)
+        {
+            Parse(address, out dataType, out dbNumber, out varType, out startByte, out bitNumber);
+        }
+
+        public static void Parse(string input, out DataType dataType, out int dbNumber, out VarType varType, out int address, out int bitNumber)
+        {
+            bitNumber = -1;
+            dbNumber = 0;
+
+            switch (input.Substring(0, 2))
+            {
+                case "DB":
+                    string[] strings = input.Split(new char[] { '.' });
+                    if (strings.Length < 2)
+                        throw new InvalidAddressException("To few periods for DB address");
+
+                    dataType = DataType.DataBlock;
+                    dbNumber = int.Parse(strings[0].Substring(2));
+                    address = int.Parse(strings[1].Substring(3));
+
+                    string dbType = strings[1].Substring(0, 3);
+                    switch (dbType)
+                    {
+                        case "DBB":
+                            varType = VarType.Byte;
+                            return;
+                        case "DBW":
+                            varType = VarType.Word;
+                            return;
+                        case "DBD":
+                            varType = VarType.DWord;
+                            return;
+                        case "DBX":
+                            bitNumber = int.Parse(strings[2]);
+                            if (bitNumber > 7)
+                                throw new InvalidAddressException("Bit can only be 0-7");
+                            varType = VarType.Bit;
+                            return;
+                        default:
+                            throw new InvalidAddressException();
+                    }
+                case "IB":
+                case "EB":
+                    // Input byte
+                    dataType = DataType.Input;
+                    dbNumber = 0;
+                    address = int.Parse(input.Substring(2));
+                    varType = VarType.Byte;
+                    return;
+                case "IW":
+                case "EW":
+                    // Input word
+                    dataType = DataType.Input;
+                    dbNumber = 0;
+                    address = int.Parse(input.Substring(2));
+                    varType = VarType.Word;
+                    return;
+                case "ID":
+                case "ED":
+                    // Input double-word
+                    dataType = DataType.Input;
+                    dbNumber = 0;
+                    address = int.Parse(input.Substring(2));
+                    varType = VarType.DWord;
+                    return;
+                case "QB":
+                case "AB":
+                case "OB":
+                    // Output byte
+                    dataType = DataType.Output;
+                    dbNumber = 0;
+                    address = int.Parse(input.Substring(2));
+                    varType = VarType.Byte;
+                    return;
+                case "QW":
+                case "AW":
+                case "OW":
+                    // Output word
+                    dataType = DataType.Output;
+                    dbNumber = 0;
+                    address = int.Parse(input.Substring(2));
+                    varType = VarType.Word;
+                    return;
+                case "QD":
+                case "AD":
+                case "OD":
+                    // Output double-word
+                    dataType = DataType.Output;
+                    dbNumber = 0;
+                    address = int.Parse(input.Substring(2));
+                    varType = VarType.DWord;
+                    return;
+                case "MB":
+                    // Memory byte
+                    dataType = DataType.Memory;
+                    dbNumber = 0;
+                    address = int.Parse(input.Substring(2));
+                    varType = VarType.Byte;
+                    return;
+                case "MW":
+                    // Memory word
+                    dataType = DataType.Memory;
+                    dbNumber = 0;
+                    address = int.Parse(input.Substring(2));
+                    varType = VarType.Word;
+                    return;
+                case "MD":
+                    // Memory double-word
+                    dataType = DataType.Memory;
+                    dbNumber = 0;
+                    address = int.Parse(input.Substring(2));
+                    varType = VarType.DWord;
+                    return;
+                default:
+                    switch (input.Substring(0, 1))
+                    {
+                        case "E":
+                        case "I":
+                            // Input
+                            dataType = DataType.Input;
+                            varType = VarType.Bit;
+                            break;
+                        case "Q":
+                        case "A":
+                        case "O":
+                            // Output
+                            dataType = DataType.Output;
+                            varType = VarType.Bit;
+                            break;
+                        case "M":
+                            // Memory
+                            dataType = DataType.Memory;
+                            varType = VarType.Bit;
+                            break;
+                        case "T":
+                            // Timer
+                            dataType = DataType.Timer;
+                            dbNumber = 0;
+                            address = int.Parse(input.Substring(1));
+                            varType = VarType.Timer;
+                            return;
+                        case "Z":
+                        case "C":
+                            // Counter
+                            dataType = DataType.Counter;
+                            dbNumber = 0;
+                            address = int.Parse(input.Substring(1));
+                            varType = VarType.Counter;
+                            return;
+                        default:
+                            throw new InvalidAddressException(string.Format("{0} is not a valid address", input.Substring(0, 1)));
+                    }
+
+                    string txt2 = input.Substring(1);
+                    if (txt2.IndexOf(".") == -1)
+                        throw new InvalidAddressException("To few periods for DB address");
+
+                    address = int.Parse(txt2.Substring(0, txt2.IndexOf(".")));
+                    bitNumber = int.Parse(txt2.Substring(txt2.IndexOf(".") + 1));
+                    if (bitNumber > 7)
+                        throw new InvalidAddressException("Bit can only be 0-7");
+                    return;
+            }
+        }
+    }
+}

常用工具集/Utility/Network/S7netplus/PLCExceptions.cs

@@ -0,0 +1,101 @@
+using System;
+using System.Runtime.Serialization;    
+
+
+namespace S7.Net
+{
+    public class WrongNumberOfBytesException : Exception
+    {
+        public WrongNumberOfBytesException() : base()
+        {
+        }
+
+        public WrongNumberOfBytesException(string message) : base(message)
+        {
+        }
+
+        public WrongNumberOfBytesException(string message, Exception innerException) : base(message, innerException)
+        {
+        }
+
+        protected WrongNumberOfBytesException(SerializationInfo info, StreamingContext context) : base(info, context)
+        {
+        }
+    }
+
+    public class InvalidAddressException : Exception
+    {
+        public InvalidAddressException() : base ()
+        {
+        }
+
+        public InvalidAddressException(string message) : base(message)
+        {
+        }
+
+        public InvalidAddressException(string message, Exception innerException) : base(message, innerException)
+        {
+        }
+
+        protected InvalidAddressException(SerializationInfo info, StreamingContext context) : base(info, context)
+        {
+        }
+    }
+
+    public class InvalidVariableTypeException : Exception
+    {
+        public InvalidVariableTypeException() : base()
+        {
+        }
+
+        public InvalidVariableTypeException(string message) : base(message)
+        {
+        }
+
+        public InvalidVariableTypeException(string message, Exception innerException) : base(message, innerException)
+        {
+        }
+
+        protected InvalidVariableTypeException(SerializationInfo info, StreamingContext context) : base(info, context)
+        {
+        }
+    }
+
+    public class TPKTInvalidException : Exception
+    {
+        public TPKTInvalidException() : base()
+        {
+        }
+
+        public TPKTInvalidException(string message) : base(message)
+        {
+        }
+
+        public TPKTInvalidException(string message, Exception innerException) : base(message, innerException)
+        {
+        }
+
+        protected TPKTInvalidException(SerializationInfo info, StreamingContext context) : base(info, context)
+        {
+        }
+    }
+
+    public class TPDUInvalidException : Exception
+    {
+        public TPDUInvalidException() : base()
+        {
+        }
+
+        public TPDUInvalidException(string message) : base(message)
+        {
+        }
+
+        public TPDUInvalidException(string message, Exception innerException) : base(message, innerException)
+        {
+        }
+
+        protected TPDUInvalidException(SerializationInfo info, StreamingContext context) : base(info, context)
+        {
+        }
+    }
+}

常用工具集/Utility/Network/S7netplus/PLCHelpers.cs

@@ -0,0 +1,265 @@
+using S7.Net.Helper;
+using S7.Net.Protocol.S7;
+using S7.Net.Types;
+using System.Collections.Generic;
+using System.Linq;
+using DateTime = S7.Net.Types.DateTime;
+
+namespace S7.Net
+{
+    public partial class Plc
+    {
+        /// <summary>
+        /// Creates the header to read bytes from the PLC
+        /// </summary>
+        /// <param name="amount"></param>
+        /// <returns></returns>
+        private static void BuildHeaderPackage(System.IO.MemoryStream stream, int amount = 1)
+        {
+            //header size = 19 bytes
+            stream.Write(new byte[] { 0x03, 0x00 });
+            //complete package size
+            stream.Write(Int.ToByteArray((short)(19 + (12 * amount))));
+            stream.Write(new byte[] { 0x02, 0xf0, 0x80, 0x32, 0x01, 0x00, 0x00, 0x00, 0x00 });
+            //data part size
+            stream.Write(Word.ToByteArray((ushort)(2 + (amount * 12))));
+            stream.Write(new byte[] { 0x00, 0x00, 0x04 });
+            //amount of requests
+            stream.WriteByte((byte)amount);
+        }
+
+        /// <summary>
+        /// Create the bytes-package to request data from the PLC. You have to specify the memory type (dataType),
+        /// the address of the memory, the address of the byte and the bytes count.
+        /// </summary>
+        /// <param name="dataType">MemoryType (DB, Timer, Counter, etc.)</param>
+        /// <param name="db">Address of the memory to be read</param>
+        /// <param name="startByteAdr">Start address of the byte</param>
+        /// <param name="count">Number of bytes to be read</param>
+        /// <returns></returns>
+        private static void BuildReadDataRequestPackage(System.IO.MemoryStream stream, DataType dataType, int db, int startByteAdr, int count = 1)
+        {
+            //single data req = 12
+            stream.Write(new byte[] { 0x12, 0x0a, 0x10 });
+            switch (dataType)
+            {
+                case DataType.Timer:
+                case DataType.Counter:
+                    stream.WriteByte((byte)dataType);
+                    break;
+                default:
+                    stream.WriteByte(0x02);
+                    break;
+            }
+
+            stream.Write(Word.ToByteArray((ushort)(count)));
+            stream.Write(Word.ToByteArray((ushort)(db)));
+            stream.WriteByte((byte)dataType);
+            var overflow = (int)(startByteAdr * 8 / 0xffffU); // handles words with address bigger than 8191
+            stream.WriteByte((byte)overflow);
+            switch (dataType)
+            {
+                case DataType.Timer:
+                case DataType.Counter:
+                    stream.Write(Word.ToByteArray((ushort)(startByteAdr)));
+                    break;
+                default:
+                    stream.Write(Word.ToByteArray((ushort)((startByteAdr) * 8)));
+                    break;
+            }
+        }
+
+        /// <summary>
+        /// Given a S7 variable type (Bool, Word, DWord, etc.), it converts the bytes in the appropriate C# format.
+        /// </summary>
+        /// <param name="varType"></param>
+        /// <param name="bytes"></param>
+        /// <param name="varCount"></param>
+        /// <param name="bitAdr"></param>
+        /// <returns></returns>
+        private object ParseBytes(VarType varType, byte[] bytes, int varCount, byte bitAdr = 0)
+        {
+            if (bytes == null || bytes.Length == 0)
+                return null;
+
+            switch (varType)
+            {
+                case VarType.Byte:
+                    if (varCount == 1)
+                        return bytes[0];
+                    else
+                        return bytes;
+                case VarType.Word:
+                    if (varCount == 1)
+                        return Word.FromByteArray(bytes);
+                    else
+                        return Word.ToArray(bytes);
+                case VarType.Int:
+                    if (varCount == 1)
+                        return Int.FromByteArray(bytes);
+                    else
+                        return Int.ToArray(bytes);
+                case VarType.DWord:
+                    if (varCount == 1)
+                        return DWord.FromByteArray(bytes);
+                    else
+                        return DWord.ToArray(bytes);
+                case VarType.DInt:
+                    if (varCount == 1)
+                        return DInt.FromByteArray(bytes);
+                    else
+                        return DInt.ToArray(bytes);
+                case VarType.Real:
+                    if (varCount == 1)
+                        return Types.Real.FromByteArray(bytes);
+                    else
+                        return Types.Real.ToArray(bytes);
+                case VarType.LReal:
+                    if (varCount == 1)
+                        return Types.LReal.FromByteArray(bytes);
+                    else
+                        return Types.LReal.ToArray(bytes);
+
+                case VarType.String:
+                    return Types.String.FromByteArray(bytes);
+                case VarType.S7String:
+                    return S7String.FromByteArray(bytes);
+                case VarType.S7WString:
+                    return S7WString.FromByteArray(bytes);
+
+                case VarType.Timer:
+                    if (varCount == 1)
+                        return Timer.FromByteArray(bytes);
+                    else
+                        return Timer.ToArray(bytes);
+                case VarType.Counter:
+                    if (varCount == 1)
+                        return Counter.FromByteArray(bytes);
+                    else
+                        return Counter.ToArray(bytes);
+                case VarType.Bit:
+                    if (varCount == 1)
+                    {
+                        if (bitAdr > 7)
+                            return null;
+                        else
+                            return Bit.FromByte(bytes[0], bitAdr);
+                    }
+                    else
+                    {
+                        return Bit.ToBitArray(bytes, varCount);
+                    }
+                case VarType.DateTime:
+                    if (varCount == 1)
+                    {
+                        return DateTime.FromByteArray(bytes);
+                    }
+                    else
+                    {
+                        return DateTime.ToArray(bytes);
+                    }
+                case VarType.DateTimeLong:
+                    if (varCount == 1)
+                    {
+                        return DateTimeLong.FromByteArray(bytes);
+                    }
+                    else
+                    {
+                        return DateTimeLong.ToArray(bytes);
+                    }
+                default:
+                    return null;
+            }
+        }
+
+        /// <summary>
+        /// Given a S7 <see cref="VarType"/> (Bool, Word, DWord, etc.), it returns how many bytes to read.
+        /// </summary>
+        /// <param name="varType"></param>
+        /// <param name="varCount"></param>
+        /// <returns>Byte lenght of variable</returns>
+        internal static int VarTypeToByteLength(VarType varType, int varCount = 1)
+        {
+            switch (varType)
+            {
+                case VarType.Bit:
+                    return (varCount + 7) / 8;
+                case VarType.Byte:
+                    return (varCount < 1) ? 1 : varCount;
+                case VarType.String:
+                    return varCount;
+                case VarType.S7String:
+                    return ((varCount + 2) & 1) == 1 ? (varCount + 3) : (varCount + 2);
+                case VarType.S7WString:
+                    return (varCount * 2) + 4;
+                case VarType.Word:
+                case VarType.Timer:
+                case VarType.Int:
+                case VarType.Counter:
+                    return varCount * 2;
+                case VarType.DWord:
+                case VarType.DInt:
+                case VarType.Real:
+                    return varCount * 4;
+                case VarType.LReal:
+                case VarType.DateTime:
+                    return varCount * 8;
+                case VarType.DateTimeLong:
+                    return varCount * 12;
+                default:
+                    return 0;
+            }
+        }
+
+        private byte[] GetS7ConnectionSetup()
+        {
+            return new byte[] {  3, 0, 0, 25, 2, 240, 128, 50, 1, 0, 0, 255, 255, 0, 8, 0, 0, 240, 0, 0, 3, 0, 3,
+                    3, 192 // Use 960 PDU size
+            };
+        }
+
+        private void ParseDataIntoDataItems(byte[] s7data, List<DataItem> dataItems)
+        {
+            int offset = 14;
+            foreach (var dataItem in dataItems)
+            {
+                // check for Return Code = Success
+                if (s7data[offset] != 0xff)
+                    throw new PlcException(ErrorCode.WrongNumberReceivedBytes);
+
+                // to Data bytes
+                offset += 4;
+
+                int byteCnt = VarTypeToByteLength(dataItem.VarType, dataItem.Count);
+                dataItem.Value = ParseBytes(
+                    dataItem.VarType,
+                    s7data.Skip(offset).Take(byteCnt).ToArray(),
+                    dataItem.Count,
+                    dataItem.BitAdr
+                );
+
+                // next Item
+                offset += byteCnt;
+
+                // Always align to even offset
+                if (offset % 2 != 0)
+                    offset++;
+            }
+        }
+
+        private static byte[] BuildReadRequestPackage(IList<DataItemAddress> dataItems)
+        {
+            int packageSize = 19 + (dataItems.Count * 12);
+            var package = new System.IO.MemoryStream(packageSize);
+
+            BuildHeaderPackage(package, dataItems.Count);
+
+            foreach (var dataItem in dataItems)
+            {
+                BuildReadDataRequestPackage(package, dataItem.DataType, dataItem.DB, dataItem.StartByteAddress, dataItem.ByteLength);
+            }
+
+            return package.ToArray();
+        }
+    }
+}

常用工具集/Utility/Network/S7netplus/PlcAsynchronous.cs

@@ -0,0 +1,582 @@
+using S7.Net.Types;
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Net.Sockets;
+using System.Threading.Tasks;
+using S7.Net.Protocol;
+using System.Threading;
+using S7.Net.Protocol.S7;
+
+namespace S7.Net
+{
+    /// <summary>
+    /// Creates an instance of S7.Net driver
+    /// </summary>
+    public partial class Plc
+    {
+        /// <summary>
+        /// Connects to the PLC and performs a COTP ConnectionRequest and S7 CommunicationSetup.
+        /// </summary>
+        /// <param name="cancellationToken">The token to monitor for cancellation requests. The default value is None.
+        /// Please note that the cancellation will not affect opening the socket in any way and only affects data transfers for configuring the connection after the socket connection is successfully established.
+        /// Please note that cancellation is advisory/cooperative and will not lead to immediate cancellation in all cases.</param>
+        /// <returns>A task that represents the asynchronous open operation.</returns>
+        public async Task OpenAsync(CancellationToken cancellationToken = default)
+        {
+            var stream = await ConnectAsync(cancellationToken).ConfigureAwait(false);
+            try
+            {
+                await queue.Enqueue(async () =>
+                {
+                    cancellationToken.ThrowIfCancellationRequested();
+                    await EstablishConnection(stream, cancellationToken).ConfigureAwait(false);
+                    _stream = stream;
+
+                    return default(object);
+                }).ConfigureAwait(false);
+            }
+            catch (Exception)
+            {
+                stream.Dispose();
+                throw;
+            }
+        }
+
+        private async Task<NetworkStream> ConnectAsync(CancellationToken cancellationToken)
+        {
+            tcpClient = new TcpClient();
+            ConfigureConnection();
+
+#if NETFRAMEWORK
+            IAsyncResult asyncResult = tcpClient.BeginConnect(IP, Port, null, null);
+            if (!asyncResult.AsyncWaitHandle.WaitOne(1000))
+            {
+                throw new Exception("<22><><EFBFBD>ӳ<EFBFBD>ʱ");
+            }
+            tcpClient.EndConnect(asyncResult);
+#else
+            await tcpClient.ConnectAsync(IP, Port, cancellationToken).ConfigureAwait(false);
+
+#endif
+            return tcpClient.GetStream();
+        }
+
+        private async Task EstablishConnection(Stream stream, CancellationToken cancellationToken)
+        {
+            await RequestConnection(stream, cancellationToken).ConfigureAwait(false);
+            await SetupConnection(stream, cancellationToken).ConfigureAwait(false);
+        }
+
+        private async Task RequestConnection(Stream stream, CancellationToken cancellationToken)
+        {
+            var requestData = ConnectionRequest.GetCOTPConnectionRequest(TsapPair);
+            var response = await NoLockRequestTpduAsync(stream, requestData, cancellationToken).ConfigureAwait(false);
+
+            if (response.PDUType != COTP.PduType.ConnectionConfirmed)
+            {
+                throw new InvalidDataException("Connection request was denied", response.TPkt.Data, 1, 0x0d);
+            }
+        }
+
+        private async Task SetupConnection(Stream stream, CancellationToken cancellationToken)
+        {
+            var setupData = GetS7ConnectionSetup();
+
+            var s7data = await NoLockRequestTsduAsync(stream, setupData, 0, setupData.Length, cancellationToken)
+                .ConfigureAwait(false);
+
+            if (s7data.Length < 2)
+                throw new WrongNumberOfBytesException("Not enough data received in response to Communication Setup");
+
+            //Check for S7 Ack Data
+            if (s7data[1] != 0x03)
+                throw new InvalidDataException("Error reading Communication Setup response", s7data, 1, 0x03);
+
+            if (s7data.Length < 20)
+                throw new WrongNumberOfBytesException("Not enough data received in response to Communication Setup");
+
+            // TODO: check if this should not rather be UInt16.
+            MaxPDUSize = s7data[18] * 256 + s7data[19];
+        }
+
+
+        /// <summary>
+        /// Reads a number of bytes from a DB starting from a specified index. This handles more than 200 bytes with multiple requests.
+        /// If the read was not successful, check LastErrorCode or LastErrorString.
+        /// </summary>
+        /// <param name="dataType">Data type of the memory area, can be DB, Timer, Counter, Merker(Memory), Input, Output.</param>
+        /// <param name="db">Address of the memory area (if you want to read DB1, this is set to 1). This must be set also for other memory area types: counters, timers,etc.</param>
+        /// <param name="startByteAdr">Start byte address. If you want to read DB1.DBW200, this is 200.</param>
+        /// <param name="count">Byte count, if you want to read 120 bytes, set this to 120.</param>
+        /// <param name="cancellationToken">The token to monitor for cancellation requests. The default value is None.
+        /// Please note that cancellation is advisory/cooperative and will not lead to immediate cancellation in all cases.</param>
+        /// <returns>Returns the bytes in an array</returns>
+        public async Task<byte[]> ReadBytesAsync(DataType dataType, int db, int startByteAdr, int count, CancellationToken cancellationToken = default)
+        {
+            var resultBytes = new byte[count];
+            int index = 0;
+            while (count > 0)
+            {
+                //This works up to MaxPDUSize-1 on SNAP7. But not MaxPDUSize-0.
+                var maxToRead = Math.Min(count, MaxPDUSize - 18);
+                await ReadBytesWithSingleRequestAsync(dataType, db, startByteAdr + index, resultBytes, index, maxToRead, cancellationToken).ConfigureAwait(false);
+                count -= maxToRead;
+                index += maxToRead;
+            }
+            return resultBytes;
+        }
+
+
+        /// <summary>
+        /// Read and decode a certain number of bytes of the "VarType" provided.
+        /// This can be used to read multiple consecutive variables of the same type (Word, DWord, Int, etc).
+        /// If the read was not successful, check LastErrorCode or LastErrorString.
+        /// </summary>
+        /// <param name="dataType">Data type of the memory area, can be DB, Timer, Counter, Merker(Memory), Input, Output.</param>
+        /// <param name="db">Address of the memory area (if you want to read DB1, this is set to 1). This must be set also for other memory area types: counters, timers,etc.</param>
+        /// <param name="startByteAdr">Start byte address. If you want to read DB1.DBW200, this is 200.</param>
+        /// <param name="varType">Type of the variable/s that you are reading</param>
+        /// <param name="bitAdr">Address of bit. If you want to read DB1.DBX200.6, set 6 to this parameter.</param>
+        /// <param name="varCount"></param>
+        /// <param name="cancellationToken">The token to monitor for cancellation requests. The default value is None.
+        /// Please note that cancellation is advisory/cooperative and will not lead to immediate cancellation in all cases.</param>
+        public async Task<object> ReadAsync(DataType dataType, int db, int startByteAdr, VarType varType, int varCount, byte bitAdr = 0, CancellationToken cancellationToken = default)
+        {
+            int cntBytes = VarTypeToByteLength(varType, varCount);
+            byte[] bytes = await ReadBytesAsync(dataType, db, startByteAdr, cntBytes, cancellationToken).ConfigureAwait(false);
+            return ParseBytes(varType, bytes, varCount, bitAdr);
+        }
+
+        /// <summary>
+        /// Reads a single variable from the PLC, takes in input strings like "DB1.DBX0.0", "DB20.DBD200", "MB20", "T45", etc.
+        /// If the read was not successful, check LastErrorCode or LastErrorString.
+        /// </summary>
+        /// <param name="variable">Input strings like "DB1.DBX0.0", "DB20.DBD200", "MB20", "T45", etc.</param>
+        /// <param name="cancellationToken">The token to monitor for cancellation requests. The default value is None.
+        /// Please note that cancellation is advisory/cooperative and will not lead to immediate cancellation in all cases.</param>
+        /// <returns>Returns an object that contains the value. This object must be cast accordingly.</returns>
+        public async Task<object> ReadAsync(string variable, CancellationToken cancellationToken = default)
+        {
+            var adr = new PLCAddress(variable);
+            return await ReadAsync(adr.DataType, adr.DbNumber, adr.StartByte, adr.VarType, 1, (byte)adr.BitNumber, cancellationToken).ConfigureAwait(false);
+        }
+
+        /// <summary>
+        /// Reads all the bytes needed to fill a struct in C#, starting from a certain address, and return an object that can be casted to the struct.
+        /// </summary>
+        /// <param name="structType">Type of the struct to be readed (es.: TypeOf(MyStruct)).</param>
+        /// <param name="db">Address of the DB.</param>
+        /// <param name="startByteAdr">Start byte address. If you want to read DB1.DBW200, this is 200.</param>
+        /// <param name="cancellationToken">The token to monitor for cancellation requests. The default value is None.
+        /// Please note that cancellation is advisory/cooperative and will not lead to immediate cancellation in all cases.</param>
+        /// <returns>Returns a struct that must be cast.</returns>
+        public async Task<object> ReadStructAsync(Type structType, int db, int startByteAdr = 0, CancellationToken cancellationToken = default)
+        {
+            int numBytes = Types.Struct.GetStructSize(structType);
+            // now read the package
+            var resultBytes = await ReadBytesAsync(DataType.DataBlock, db, startByteAdr, numBytes, cancellationToken).ConfigureAwait(false);
+
+            // and decode it
+            return Types.Struct.FromBytes(structType, resultBytes);
+        }
+
+        /// <summary>
+        /// Reads all the bytes needed to fill a struct in C#, starting from a certain address, and returns the struct or null if nothing was read.
+        /// </summary>
+        /// <typeparam name="T">The struct type</typeparam>
+        /// <param name="db">Address of the DB.</param>
+        /// <param name="startByteAdr">Start byte address. If you want to read DB1.DBW200, this is 200.</param>
+        /// <param name="cancellationToken">The token to monitor for cancellation requests. The default value is None.
+        /// Please note that cancellation is advisory/cooperative and will not lead to immediate cancellation in all cases.</param>
+        /// <returns>Returns a nulable struct. If nothing was read null will be returned.</returns>
+        public async Task<T?> ReadStructAsync<T>(int db, int startByteAdr = 0, CancellationToken cancellationToken = default) where T : struct
+        {
+            return await ReadStructAsync(typeof(T), db, startByteAdr, cancellationToken).ConfigureAwait(false) as T?;
+        }
+
+        /// <summary>
+        /// Reads all the bytes needed to fill a class in C#, starting from a certain address, and set all the properties values to the value that are read from the PLC.
+        /// This reads only properties, it doesn't read private variable or public variable without {get;set;} specified.
+        /// </summary>
+        /// <param name="sourceClass">Instance of the class that will store the values</param>
+        /// <param name="db">Index of the DB; es.: 1 is for DB1</param>
+        /// <param name="startByteAdr">Start byte address. If you want to read DB1.DBW200, this is 200.</param>
+        /// <param name="cancellationToken">The token to monitor for cancellation requests. The default value is None.
+        /// Please note that cancellation is advisory/cooperative and will not lead to immediate cancellation in all cases.</param>
+        /// <returns>The number of read bytes</returns>
+        public async Task<Tuple<int, object>> ReadClassAsync(object sourceClass, int db, int startByteAdr = 0, CancellationToken cancellationToken = default)
+        {
+            int numBytes = (int)Class.GetClassSize(sourceClass);
+            if (numBytes <= 0)
+            {
+                throw new Exception("The size of the class is less than 1 byte and therefore cannot be read");
+            }
+
+            // now read the package
+            var resultBytes = await ReadBytesAsync(DataType.DataBlock, db, startByteAdr, numBytes, cancellationToken).ConfigureAwait(false);
+            // and decode it
+            Class.FromBytes(sourceClass, resultBytes);
+
+            return new Tuple<int, object>(resultBytes.Length, sourceClass);
+        }
+
+        /// <summary>
+        /// Reads all the bytes needed to fill a class in C#, starting from a certain address, and set all the properties values to the value that are read from the PLC.
+        /// This reads only properties, it doesn't read private variable or public variable without {get;set;} specified. To instantiate the class defined by the generic
+        /// type, the class needs a default constructor.
+        /// </summary>
+        /// <typeparam name="T">The class that will be instantiated. Requires a default constructor</typeparam>
+        /// <param name="db">Index of the DB; es.: 1 is for DB1</param>
+        /// <param name="startByteAdr">Start byte address. If you want to read DB1.DBW200, this is 200.</param>
+        /// <param name="cancellationToken">The token to monitor for cancellation requests. The default value is None.
+        /// Please note that cancellation is advisory/cooperative and will not lead to immediate cancellation in all cases.</param>
+        /// <returns>An instance of the class with the values read from the PLC. If no data has been read, null will be returned</returns>
+        public async Task<T> ReadClassAsync<T>(int db, int startByteAdr = 0, CancellationToken cancellationToken = default) where T : class
+        {
+            return await ReadClassAsync(() => Activator.CreateInstance<T>(), db, startByteAdr, cancellationToken).ConfigureAwait(false);
+        }
+
+        /// <summary>
+        /// Reads all the bytes needed to fill a class in C#, starting from a certain address, and set all the properties values to the value that are read from the PLC.
+        /// This reads only properties, it doesn't read private variable or public variable without {get;set;} specified.
+        /// </summary>
+        /// <typeparam name="T">The class that will be instantiated</typeparam>
+        /// <param name="classFactory">Function to instantiate the class</param>
+        /// <param name="db">Index of the DB; es.: 1 is for DB1</param>
+        /// <param name="startByteAdr">Start byte address. If you want to read DB1.DBW200, this is 200.</param>
+        /// <param name="cancellationToken">The token to monitor for cancellation requests. The default value is None.
+        /// Please note that cancellation is advisory/cooperative and will not lead to immediate cancellation in all cases.</param>
+        /// <returns>An instance of the class with the values read from the PLC. If no data has been read, null will be returned</returns>
+        public async Task<T> ReadClassAsync<T>(Func<T> classFactory, int db, int startByteAdr = 0, CancellationToken cancellationToken = default) where T : class
+        {
+            var instance = classFactory();
+            var res = await ReadClassAsync(instance, db, startByteAdr, cancellationToken).ConfigureAwait(false);
+            int readBytes = res.Item1;
+            if (readBytes <= 0)
+            {
+                return null;
+            }
+
+            return (T)res.Item2;
+        }
+
+        /// <summary>
+        /// Reads multiple vars in a single request.
+        /// You have to create and pass a list of DataItems and you obtain in response the same list with the values.
+        /// Values are stored in the property "Value" of the dataItem and are already converted.
+        /// If you don't want the conversion, just create a dataItem of bytes.
+        /// The number of DataItems as well as the total size of the requested data can not exceed a certain limit (protocol restriction).
+        /// </summary>
+        /// <param name="dataItems">List of dataitems that contains the list of variables that must be read.</param>
+        /// <param name="cancellationToken">The token to monitor for cancellation requests. The default value is None.
+        /// Please note that cancellation is advisory/cooperative and will not lead to immediate cancellation in all cases.</param>
+        public async Task<List<DataItem>> ReadMultipleVarsAsync(List<DataItem> dataItems, CancellationToken cancellationToken = default)
+        {
+            //Snap7 seems to choke on PDU sizes above 256 even if snap7
+            //replies with bigger PDU size in connection setup.
+            AssertPduSizeForRead(dataItems);
+
+            try
+            {
+                var dataToSend = BuildReadRequestPackage(dataItems.Select(d => DataItem.GetDataItemAddress(d)).ToList());
+                var s7data = await RequestTsduAsync(dataToSend, cancellationToken);
+
+                ValidateResponseCode((ReadWriteErrorCode)s7data[14]);
+
+                ParseDataIntoDataItems(s7data, dataItems);
+            }
+            catch (SocketException socketException)
+            {
+                throw new PlcException(ErrorCode.ReadData, socketException);
+            }
+            catch (OperationCanceledException)
+            {
+                throw;
+            }
+            catch (Exception exc)
+            {
+                throw new PlcException(ErrorCode.ReadData, exc);
+            }
+            return dataItems;
+        }
+
+
+        /// <summary>
+        /// Write a number of bytes from a DB starting from a specified index. This handles more than 200 bytes with multiple requests.
+        /// If the write was not successful, check LastErrorCode or LastErrorString.
+        /// </summary>
+        /// <param name="dataType">Data type of the memory area, can be DB, Timer, Counter, Merker(Memory), Input, Output.</param>
+        /// <param name="db">Address of the memory area (if you want to read DB1, this is set to 1). This must be set also for other memory area types: counters, timers,etc.</param>
+        /// <param name="startByteAdr">Start byte address. If you want to write DB1.DBW200, this is 200.</param>
+        /// <param name="value">Bytes to write. If more than 200, multiple requests will be made.</param>
+        /// <param name="cancellationToken">The token to monitor for cancellation requests. The default value is None.
+        /// Please note that cancellation is advisory/cooperative and will not lead to immediate cancellation in all cases.</param>
+        /// <returns>A task that represents the asynchronous write operation.</returns>
+        public async Task WriteBytesAsync(DataType dataType, int db, int startByteAdr, byte[] value, CancellationToken cancellationToken = default)
+        {
+            int localIndex = 0;
+            int count = value.Length;
+            while (count > 0)
+            {
+                var maxToWrite = (int)Math.Min(count, MaxPDUSize - 35);
+                await WriteBytesWithASingleRequestAsync(dataType, db, startByteAdr + localIndex, value, localIndex, maxToWrite, cancellationToken).ConfigureAwait(false);
+                count -= maxToWrite;
+                localIndex += maxToWrite;
+            }
+        }
+
+        /// <summary>
+        /// Write a single bit from a DB with the specified index.
+        /// </summary>
+        /// <param name="dataType">Data type of the memory area, can be DB, Timer, Counter, Merker(Memory), Input, Output.</param>
+        /// <param name="db">Address of the memory area (if you want to read DB1, this is set to 1). This must be set also for other memory area types: counters, timers,etc.</param>
+        /// <param name="startByteAdr">Start byte address. If you want to write DB1.DBW200, this is 200.</param>
+        /// <param name="bitAdr">The address of the bit. (0-7)</param>
+        /// <param name="value">Bytes to write. If more than 200, multiple requests will be made.</param>
+        /// <param name="cancellationToken">The token to monitor for cancellation requests. The default value is None.
+        /// Please note that cancellation is advisory/cooperative and will not lead to immediate cancellation in all cases.</param>
+        /// <returns>A task that represents the asynchronous write operation.</returns>
+        public async Task WriteBitAsync(DataType dataType, int db, int startByteAdr, int bitAdr, bool value, CancellationToken cancellationToken = default)
+        {
+            if (bitAdr < 0 || bitAdr > 7)
+                throw new InvalidAddressException(string.Format("Addressing Error: You can only reference bitwise locations 0-7. Address {0} is invalid", bitAdr));
+
+            await WriteBitWithASingleRequestAsync(dataType, db, startByteAdr, bitAdr, value, cancellationToken).ConfigureAwait(false);
+        }
+
+        /// <summary>
+        /// Write a single bit from a DB with the specified index.
+        /// </summary>
+        /// <param name="dataType">Data type of the memory area, can be DB, Timer, Counter, Merker(Memory), Input, Output.</param>
+        /// <param name="db">Address of the memory area (if you want to read DB1, this is set to 1). This must be set also for other memory area types: counters, timers,etc.</param>
+        /// <param name="startByteAdr">Start byte address. If you want to write DB1.DBW200, this is 200.</param>
+        /// <param name="bitAdr">The address of the bit. (0-7)</param>
+        /// <param name="value">Bytes to write. If more than 200, multiple requests will be made.</param>
+        /// <param name="cancellationToken">The token to monitor for cancellation requests. The default value is None.
+        /// Please note that cancellation is advisory/cooperative and will not lead to immediate cancellation in all cases.</param>
+        /// <returns>A task that represents the asynchronous write operation.</returns>
+        public async Task WriteBitAsync(DataType dataType, int db, int startByteAdr, int bitAdr, int value, CancellationToken cancellationToken = default)
+        {
+            if (value < 0 || value > 1)
+                throw new ArgumentException("Value must be 0 or 1", nameof(value));
+
+            await WriteBitAsync(dataType, db, startByteAdr, bitAdr, value == 1, cancellationToken).ConfigureAwait(false);
+        }
+
+        /// <summary>
+        /// Takes in input an object and tries to parse it to an array of values. This can be used to write many data, all of the same type.
+        /// You must specify the memory area type, memory are address, byte start address and bytes count.
+        /// If the read was not successful, check LastErrorCode or LastErrorString.
+        /// </summary>
+        /// <param name="dataType">Data type of the memory area, can be DB, Timer, Counter, Merker(Memory), Input, Output.</param>
+        /// <param name="db">Address of the memory area (if you want to read DB1, this is set to 1). This must be set also for other memory area types: counters, timers,etc.</param>
+        /// <param name="startByteAdr">Start byte address. If you want to read DB1.DBW200, this is 200.</param>
+        /// <param name="value">Bytes to write. The lenght of this parameter can't be higher than 200. If you need more, use recursion.</param>
+        /// <param name="bitAdr">The address of the bit. (0-7)</param>
+        /// <param name="cancellationToken">The token to monitor for cancellation requests. The default value is None.
+        /// Please note that cancellation is advisory/cooperative and will not lead to immediate cancellation in all cases.</param>
+        /// <returns>A task that represents the asynchronous write operation.</returns>
+        public async Task WriteAsync(DataType dataType, int db, int startByteAdr, object value, int bitAdr = -1, CancellationToken cancellationToken = default)
+        {
+            if (bitAdr != -1)
+            {
+                //Must be writing a bit value as bitAdr is specified
+                if (value is bool boolean)
+                {
+                    await WriteBitAsync(dataType, db, startByteAdr, bitAdr, boolean, cancellationToken).ConfigureAwait(false);
+                }
+                else if (value is int intValue)
+                {
+                    if (intValue < 0 || intValue > 7)
+                        throw new ArgumentOutOfRangeException(
+                            string.Format(
+                                "Addressing Error: You can only reference bitwise locations 0-7. Address {0} is invalid",
+                                bitAdr), nameof(bitAdr));
+
+                    await WriteBitAsync(dataType, db, startByteAdr, bitAdr, intValue == 1, cancellationToken).ConfigureAwait(false);
+                }
+                else throw new ArgumentException("Value must be a bool or an int to write a bit", nameof(value));
+            }
+            else await WriteBytesAsync(dataType, db, startByteAdr, Serialization.SerializeValue(value), cancellationToken).ConfigureAwait(false);
+        }
+
+        /// <summary>
+        /// Writes a single variable from the PLC, takes in input strings like "DB1.DBX0.0", "DB20.DBD200", "MB20", "T45", etc.
+        /// If the write was not successful, check <see cref="LastErrorCode"/> or <see cref="LastErrorString"/>.
+        /// </summary>
+        /// <param name="variable">Input strings like "DB1.DBX0.0", "DB20.DBD200", "MB20", "T45", etc.</param>
+        /// <param name="value">Value to be written to the PLC</param>
+        /// <param name="cancellationToken">The token to monitor for cancellation requests. The default value is None.
+        /// Please note that cancellation is advisory/cooperative and will not lead to immediate cancellation in all cases.</param>
+        /// <returns>A task that represents the asynchronous write operation.</returns>
+        public async Task WriteAsync(string variable, object value, CancellationToken cancellationToken = default)
+        {
+            var adr = new PLCAddress(variable);
+            await WriteAsync(adr.DataType, adr.DbNumber, adr.StartByte, value, adr.BitNumber, cancellationToken).ConfigureAwait(false);
+        }
+
+        /// <summary>
+        /// Writes a C# struct to a DB in the PLC
+        /// </summary>
+        /// <param name="structValue">The struct to be written</param>
+        /// <param name="db">Db address</param>
+        /// <param name="startByteAdr">Start bytes on the PLC</param>
+        /// <param name="cancellationToken">The token to monitor for cancellation requests. The default value is None.
+        /// Please note that cancellation is advisory/cooperative and will not lead to immediate cancellation in all cases.</param>
+        /// <returns>A task that represents the asynchronous write operation.</returns>
+        public async Task WriteStructAsync(object structValue, int db, int startByteAdr = 0, CancellationToken cancellationToken = default)
+        {
+            var bytes = Struct.ToBytes(structValue).ToList();
+            await WriteBytesAsync(DataType.DataBlock, db, startByteAdr, bytes.ToArray(), cancellationToken).ConfigureAwait(false);
+        }
+
+        /// <summary>
+        /// Writes a C# class to a DB in the PLC
+        /// </summary>
+        /// <param name="classValue">The class to be written</param>
+        /// <param name="db">Db address</param>
+        /// <param name="startByteAdr">Start bytes on the PLC</param>
+        /// <param name="cancellationToken">The token to monitor for cancellation requests. The default value is None.
+        /// Please note that cancellation is advisory/cooperative and will not lead to immediate cancellation in all cases.</param>
+        /// <returns>A task that represents the asynchronous write operation.</returns>
+        public async Task WriteClassAsync(object classValue, int db, int startByteAdr = 0, CancellationToken cancellationToken = default)
+        {
+            byte[] bytes = new byte[(int)Class.GetClassSize(classValue)];
+            Types.Class.ToBytes(classValue, bytes);
+            await WriteBytesAsync(DataType.DataBlock, db, startByteAdr, bytes, cancellationToken).ConfigureAwait(false);
+        }
+
+        private async Task ReadBytesWithSingleRequestAsync(DataType dataType, int db, int startByteAdr, byte[] buffer, int offset, int count, CancellationToken cancellationToken)
+        {
+            var dataToSend = BuildReadRequestPackage(new[] { new DataItemAddress(dataType, db, startByteAdr, count) });
+
+            var s7data = await RequestTsduAsync(dataToSend, cancellationToken);
+            AssertReadResponse(s7data, count);
+
+            Array.Copy(s7data, 18, buffer, offset, count);
+        }
+
+        /// <summary>
+        /// Write DataItem(s) to the PLC. Throws an exception if the response is invalid
+        /// or when the PLC reports errors for item(s) written.
+        /// </summary>
+        /// <param name="dataItems">The DataItem(s) to write to the PLC.</param>
+        /// <returns>Task that completes when response from PLC is parsed.</returns>
+        public async Task WriteAsync(params DataItem[] dataItems)
+        {
+            AssertPduSizeForWrite(dataItems);
+
+            var message = new ByteArray();
+            var length = S7WriteMultiple.CreateRequest(message, dataItems);
+
+            var response = await RequestTsduAsync(message.Array, 0, length).ConfigureAwait(false);
+
+            S7WriteMultiple.ParseResponse(response, response.Length, dataItems);
+        }
+
+        /// <summary>
+        /// Writes up to 200 bytes to the PLC. You must specify the memory area type, memory are address, byte start address and bytes count.
+        /// </summary>
+        /// <param name="dataType">Data type of the memory area, can be DB, Timer, Counter, Merker(Memory), Input, Output.</param>
+        /// <param name="db">Address of the memory area (if you want to read DB1, this is set to 1). This must be set also for other memory area types: counters, timers,etc.</param>
+        /// <param name="startByteAdr">Start byte address. If you want to read DB1.DBW200, this is 200.</param>
+        /// <param name="value">Bytes to write. The lenght of this parameter can't be higher than 200. If you need more, use recursion.</param>
+        /// <returns>A task that represents the asynchronous write operation.</returns>
+        private async Task WriteBytesWithASingleRequestAsync(DataType dataType, int db, int startByteAdr, byte[] value, int dataOffset, int count, CancellationToken cancellationToken)
+        {
+            try
+            {
+                var dataToSend = BuildWriteBytesPackage(dataType, db, startByteAdr, value, dataOffset, count);
+                var s7data = await RequestTsduAsync(dataToSend, cancellationToken).ConfigureAwait(false);
+
+                ValidateResponseCode((ReadWriteErrorCode)s7data[14]);
+            }
+            catch (OperationCanceledException)
+            {
+                throw;
+            }
+            catch (Exception exc)
+            {
+                throw new PlcException(ErrorCode.WriteData, exc);
+            }
+        }
+
+        private async Task WriteBitWithASingleRequestAsync(DataType dataType, int db, int startByteAdr, int bitAdr, bool bitValue, CancellationToken cancellationToken)
+        {
+            try
+            {
+                var dataToSend = BuildWriteBitPackage(dataType, db, startByteAdr, bitValue, bitAdr);
+                var s7data = await RequestTsduAsync(dataToSend, cancellationToken).ConfigureAwait(false);
+
+                ValidateResponseCode((ReadWriteErrorCode)s7data[14]);
+            }
+            catch (OperationCanceledException)
+            {
+                throw;
+            }
+            catch (Exception exc)
+            {
+                throw new PlcException(ErrorCode.WriteData, exc);
+            }
+        }
+
+        private Task<byte[]> RequestTsduAsync(byte[] requestData, CancellationToken cancellationToken = default) =>
+            RequestTsduAsync(requestData, 0, requestData.Length, cancellationToken);
+
+        private Task<byte[]> RequestTsduAsync(byte[] requestData, int offset, int length, CancellationToken cancellationToken = default)
+        {
+            var stream = GetStreamIfAvailable();
+
+            return queue.Enqueue(() =>
+                NoLockRequestTsduAsync(stream, requestData, offset, length, cancellationToken));
+        }
+
+        private async Task<COTP.TPDU> NoLockRequestTpduAsync(Stream stream, byte[] requestData,
+            CancellationToken cancellationToken = default)
+        {
+            cancellationToken.ThrowIfCancellationRequested();
+            try
+            {
+                using (var closeOnCancellation = cancellationToken.Register(Close))
+                {
+                    await stream.WriteAsync(requestData, 0, requestData.Length, cancellationToken).ConfigureAwait(false);
+                    return await COTP.TPDU.ReadAsync(stream, cancellationToken).ConfigureAwait(false);
+                }
+            }
+            catch (Exception exc)
+            {
+                if (exc is TPDUInvalidException || exc is TPKTInvalidException)
+                {
+                    Close();
+                }
+
+                throw;
+            }
+        }
+
+        private async Task<byte[]> NoLockRequestTsduAsync(Stream stream, byte[] requestData, int offset, int length,
+            CancellationToken cancellationToken = default)
+        {
+            cancellationToken.ThrowIfCancellationRequested();
+            try
+            {
+                using (var closeOnCancellation = cancellationToken.Register(Close))
+                {
+                    await stream.WriteAsync(requestData, offset, length, cancellationToken).ConfigureAwait(false);
+                    return await COTP.TSDU.ReadAsync(stream, cancellationToken).ConfigureAwait(false);
+                }
+            }
+            catch (Exception exc)
+            {
+                if (exc is TPDUInvalidException || exc is TPKTInvalidException)
+                {
+                    Close();
+                }
+
+                throw;
+            }
+        }
+    }
+}

常用工具集/Utility/Network/S7netplus/PlcException.cs

@@ -0,0 +1,34 @@
+using System;
+
+namespace S7.Net
+{
+    [Serializable]
+    public class PlcException : Exception
+    {
+        public ErrorCode ErrorCode { get; }
+
+        public PlcException(ErrorCode errorCode) : this(errorCode, $"PLC communication failed with error '{errorCode}'.")
+        {
+        }
+
+        public PlcException(ErrorCode errorCode, Exception innerException) : this(errorCode, innerException.Message,
+            innerException)
+        {
+        }
+
+        public PlcException(ErrorCode errorCode, string message) : base(message)
+        {
+            ErrorCode = errorCode;
+        }
+
+        public PlcException(ErrorCode errorCode, string message, Exception inner) : base(message, inner)
+        {
+            ErrorCode = errorCode;
+        }
+
+        protected PlcException(System.Runtime.Serialization.SerializationInfo info,System.Runtime.Serialization.StreamingContext context) : base(info, context)
+        {
+            ErrorCode = (ErrorCode) info.GetInt32(nameof(ErrorCode));
+        }
+    }
+}

常用工具集/Utility/Network/S7netplus/PlcSynchronous.cs

@@ -0,0 +1,585 @@
+using S7.Net.Types;
+using System;
+using System.IO;
+using System.Collections.Generic;
+using S7.Net.Protocol;
+using S7.Net.Helper;
+using System.Net.Sockets;
+using System.Threading;
+
+//Implement synchronous methods here
+namespace S7.Net
+{
+    public partial class Plc
+    {
+        /// <summary>
+        /// Connects to the PLC and performs a COTP ConnectionRequest and S7 CommunicationSetup.
+        /// </summary>
+        public void Open(int timeout = 0)
+        {
+            try
+            {
+                if (timeout == 0)
+                {
+                    OpenAsync().GetAwaiter().GetResult();
+                }
+                else
+                {
+                    CancellationTokenSource cts = new CancellationTokenSource(timeout);
+                    OpenAsync(cts.Token).GetAwaiter().GetResult();
+                }
+            }
+            catch (Exception exc)
+            {
+                throw new PlcException(ErrorCode.ConnectionError,
+                    $"Couldn't establish the connection to {IP}.\nMessage: {exc.Message}", exc);
+            }
+        }
+
+
+
+        /// <summary>
+        /// Reads a number of bytes from a DB starting from a specified index. This handles more than 200 bytes with multiple requests.
+        /// If the read was not successful, check LastErrorCode or LastErrorString.
+        /// </summary>
+        /// <param name="dataType">Data type of the memory area, can be DB, Timer, Counter, Merker(Memory), Input, Output.</param>
+        /// <param name="db">Address of the memory area (if you want to read DB1, this is set to 1). This must be set also for other memory area types: counters, timers,etc.</param>
+        /// <param name="startByteAdr">Start byte address. If you want to read DB1.DBW200, this is 200.</param>
+        /// <param name="count">Byte count, if you want to read 120 bytes, set this to 120.</param>
+        /// <returns>Returns the bytes in an array</returns>
+        public byte[] ReadBytes(DataType dataType, int db, int startByteAdr, int count)
+        {
+            //var result = new byte[count];
+
+            //ReadBytes(result, dataType, db, startByteAdr);
+
+            //return result;
+
+
+            var result = new byte[count];
+            int index = 0;
+            while (count > 0)
+            {
+                //This works up to MaxPDUSize-1 on SNAP7. But not MaxPDUSize-0.
+                var maxToRead = Math.Min(count, MaxPDUSize - 18);
+                ReadBytesWithSingleRequest(dataType, db, startByteAdr + index, result, index, maxToRead);
+                count -= maxToRead;
+                index += maxToRead;
+            }
+            return result;
+
+        }
+
+        private void ReadBytesWithSingleRequest(DataType dataType, int db, int startByteAdr, byte[] buffer, int offset, int count)
+        {
+            try
+            {
+                // first create the header
+                int packageSize = 19 + 12; // 19 header + 12 for 1 request
+                var package = new System.IO.MemoryStream(packageSize);
+                BuildHeaderPackage(package);
+                // package.Add(0x02);  // datenart
+                BuildReadDataRequestPackage(package, dataType, db, startByteAdr, count);
+
+                var dataToSend = package.ToArray();
+                var s7data = RequestTsdu(dataToSend);
+                AssertReadResponse(s7data, count);
+
+                Array.Copy(s7data, 18, buffer, offset, count);
+            }
+            catch (Exception exc)
+            {
+                throw new PlcException(ErrorCode.ReadData, exc);
+            }
+        }
+
+        /// <summary>
+        /// Read and decode a certain number of bytes of the "VarType" provided.
+        /// This can be used to read multiple consecutive variables of the same type (Word, DWord, Int, etc).
+        /// If the read was not successful, check LastErrorCode or LastErrorString.
+        /// </summary>
+        /// <param name="dataType">Data type of the memory area, can be DB, Timer, Counter, Merker(Memory), Input, Output.</param>
+        /// <param name="db">Address of the memory area (if you want to read DB1, this is set to 1). This must be set also for other memory area types: counters, timers,etc.</param>
+        /// <param name="startByteAdr">Start byte address. If you want to read DB1.DBW200, this is 200.</param>
+        /// <param name="varType">Type of the variable/s that you are reading</param>
+        /// <param name="bitAdr">Address of bit. If you want to read DB1.DBX200.6, set 6 to this parameter.</param>
+        /// <param name="varCount"></param>
+        public object Read(DataType dataType, int db, int startByteAdr, VarType varType, int varCount, byte bitAdr = 0)
+        {
+            int cntBytes = VarTypeToByteLength(varType, varCount);
+            byte[] bytes = ReadBytes(dataType, db, startByteAdr, cntBytes);
+
+            return ParseBytes(varType, bytes, varCount, bitAdr);
+        }
+
+        /// <summary>
+        /// Reads a single variable from the PLC, takes in input strings like "DB1.DBX0.0", "DB20.DBD200", "MB20", "T45", etc.
+        /// If the read was not successful, check LastErrorCode or LastErrorString.
+        /// </summary>
+        /// <param name="variable">Input strings like "DB1.DBX0.0", "DB20.DBD200", "MB20", "T45", etc.</param>
+        /// <returns>Returns an object that contains the value. This object must be cast accordingly. If no data has been read, null will be returned</returns>
+        public object Read(string variable)
+        {
+            var adr = new PLCAddress(variable);
+            return Read(adr.DataType, adr.DbNumber, adr.StartByte, adr.VarType, 1, (byte)adr.BitNumber);
+        }
+
+        /// <summary>
+        /// Reads all the bytes needed to fill a struct in C#, starting from a certain address, and return an object that can be casted to the struct.
+        /// </summary>
+        /// <param name="structType">Type of the struct to be readed (es.: TypeOf(MyStruct)).</param>
+        /// <param name="db">Address of the DB.</param>
+        /// <param name="startByteAdr">Start byte address. If you want to read DB1.DBW200, this is 200.</param>
+        /// <returns>Returns a struct that must be cast. If no data has been read, null will be returned</returns>
+        public object ReadStruct(Type structType, int db, int startByteAdr = 0)
+        {
+            int numBytes = Struct.GetStructSize(structType);
+            // now read the package
+            var resultBytes = ReadBytes(DataType.DataBlock, db, startByteAdr, numBytes);
+
+            // and decode it
+            return Struct.FromBytes(structType, resultBytes);
+        }
+
+        /// <summary>
+        /// Reads all the bytes needed to fill a struct in C#, starting from a certain address, and returns the struct or null if nothing was read.
+        /// </summary>
+        /// <typeparam name="T">The struct type</typeparam>
+        /// <param name="db">Address of the DB.</param>
+        /// <param name="startByteAdr">Start byte address. If you want to read DB1.DBW200, this is 200.</param>
+        /// <returns>Returns a nullable struct. If nothing was read null will be returned.</returns>
+        public T? ReadStruct<T>(int db, int startByteAdr = 0) where T : struct
+        {
+            return ReadStruct(typeof(T), db, startByteAdr) as T?;
+        }
+
+        /// <summary>
+        /// Reads all the bytes needed to fill a class in C#, starting from a certain address, and set all the properties values to the value that are read from the PLC.
+        /// This reads only properties, it doesn't read private variable or public variable without {get;set;} specified.
+        /// </summary>
+        /// <param name="sourceClass">Instance of the class that will store the values</param>
+        /// <param name="db">Index of the DB; es.: 1 is for DB1</param>
+        /// <param name="startByteAdr">Start byte address. If you want to read DB1.DBW200, this is 200.</param>
+        /// <returns>The number of read bytes</returns>
+        public int ReadClass(object sourceClass, int db, int startByteAdr = 0)
+        {
+            int numBytes = (int)Class.GetClassSize(sourceClass);
+            if (numBytes <= 0)
+            {
+                throw new Exception("The size of the class is less than 1 byte and therefore cannot be read");
+            }
+
+            // now read the package
+            var resultBytes = ReadBytes(DataType.DataBlock, db, startByteAdr, numBytes);
+            // and decode it
+            Class.FromBytes(sourceClass, resultBytes);
+            return resultBytes.Length;
+        }
+
+        /// <summary>
+        /// Reads all the bytes needed to fill a class in C#, starting from a certain address, and set all the properties values to the value that are read from the PLC.
+        /// This reads only properties, it doesn't read private variable or public variable without {get;set;} specified. To instantiate the class defined by the generic
+        /// type, the class needs a default constructor.
+        /// </summary>
+        /// <typeparam name="T">The class that will be instantiated. Requires a default constructor</typeparam>
+        /// <param name="db">Index of the DB; es.: 1 is for DB1</param>
+        /// <param name="startByteAdr">Start byte address. If you want to read DB1.DBW200, this is 200.</param>
+        /// <returns>An instance of the class with the values read from the PLC. If no data has been read, null will be returned</returns>
+        public T ReadClass<T>(int db, int startByteAdr = 0) where T : class
+        {
+            return ReadClass(() => Activator.CreateInstance<T>(), db, startByteAdr);
+        }
+
+        /// <summary>
+        /// Reads all the bytes needed to fill a class in C#, starting from a certain address, and set all the properties values to the value that are read from the PLC.
+        /// This reads only properties, it doesn't read private variable or public variable without {get;set;} specified.
+        /// </summary>
+        /// <typeparam name="T">The class that will be instantiated</typeparam>
+        /// <param name="classFactory">Function to instantiate the class</param>
+        /// <param name="db">Index of the DB; es.: 1 is for DB1</param>
+        /// <param name="startByteAdr">Start byte address. If you want to read DB1.DBW200, this is 200.</param>
+        /// <returns>An instance of the class with the values read from the PLC. If no data has been read, null will be returned</returns>
+        public T ReadClass<T>(Func<T> classFactory, int db, int startByteAdr = 0) where T : class
+        {
+            var instance = classFactory();
+            int readBytes = ReadClass(instance, db, startByteAdr);
+            if (readBytes <= 0)
+            {
+                return null;
+            }
+            return instance;
+        }
+
+        /// <summary>
+        /// Write a number of bytes from a DB starting from a specified index. This handles more than 200 bytes with multiple requests.
+        /// If the write was not successful, check LastErrorCode or LastErrorString.
+        /// </summary>
+        /// <param name="dataType">Data type of the memory area, can be DB, Timer, Counter, Merker(Memory), Input, Output.</param>
+        /// <param name="db">Address of the memory area (if you want to read DB1, this is set to 1). This must be set also for other memory area types: counters, timers,etc.</param>
+        /// <param name="startByteAdr">Start byte address. If you want to write DB1.DBW200, this is 200.</param>
+        /// <param name="value">Bytes to write. If more than 200, multiple requests will be made.</param>
+        public void WriteBytes(DataType dataType, int db, int startByteAdr, byte[] value)
+        {
+            //WriteBytes(dataType, db, startByteAdr, value.AsSpan());
+            int localIndex = 0;
+            int count = value.Length;
+            while (count > 0)
+            {
+                //TODO: Figure out how to use MaxPDUSize here
+                //Snap7 seems to choke on PDU sizes above 256 even if snap7
+                //replies with bigger PDU size in connection setup.
+                var maxToWrite = Math.Min(count, MaxPDUSize - 28);//TODO tested only when the MaxPDUSize is 480
+                WriteBytesWithASingleRequest(dataType, db, startByteAdr + localIndex, value, localIndex, maxToWrite);
+                count -= maxToWrite;
+                localIndex += maxToWrite;
+            }
+        }
+        private void WriteBytesWithASingleRequest(DataType dataType, int db, int startByteAdr, byte[] value, int dataOffset, int count)
+        {
+            try
+            {
+                var dataToSend = BuildWriteBytesPackage(dataType, db, startByteAdr, value, dataOffset, count);
+                var s7data = RequestTsdu(dataToSend);
+
+                ValidateResponseCode((ReadWriteErrorCode)s7data[14]);
+            }
+            catch (Exception exc)
+            {
+                throw new PlcException(ErrorCode.WriteData, exc);
+            }
+        }
+        /// <summary>
+        /// Write a number of bytes from a DB starting from a specified index. This handles more than 200 bytes with multiple requests.
+        /// If the write was not successful, check LastErrorCode or LastErrorString.
+        /// </summary>
+        /// <param name="dataType">Data type of the memory area, can be DB, Timer, Counter, Merker(Memory), Input, Output.</param>
+        /// <param name="db">Address of the memory area (if you want to read DB1, this is set to 1). This must be set also for other memory area types: counters, timers,etc.</param>
+        /// <param name="startByteAdr">Start byte address. If you want to write DB1.DBW200, this is 200.</param>
+        /// <param name="value">Bytes to write. If more than 200, multiple requests will be made.</param>
+        //public void WriteBytes(DataType dataType, int db, int startByteAdr, ReadOnlySpan<byte> value)
+        //{
+        //    int localIndex = 0;
+        //    while (value.Length > 0)
+        //    {
+        //        //TODO: Figure out how to use MaxPDUSize here
+        //        //Snap7 seems to choke on PDU sizes above 256 even if snap7
+        //        //replies with bigger PDU size in connection setup.
+        //        var maxToWrite = Math.Min(value.Length, MaxPDUSize - 28);//TODO tested only when the MaxPDUSize is 480
+        //        WriteBytesWithASingleRequest(dataType, db, startByteAdr + localIndex, value.Slice(0, maxToWrite));
+        //        value = value.Slice(maxToWrite);
+        //        localIndex += maxToWrite;
+        //    }
+        //}
+
+        /// <summary>
+        /// Write a single bit from a DB with the specified index.
+        /// </summary>
+        /// <param name="dataType">Data type of the memory area, can be DB, Timer, Counter, Merker(Memory), Input, Output.</param>
+        /// <param name="db">Address of the memory area (if you want to read DB1, this is set to 1). This must be set also for other memory area types: counters, timers,etc.</param>
+        /// <param name="startByteAdr">Start byte address. If you want to write DB1.DBW200, this is 200.</param>
+        /// <param name="bitAdr">The address of the bit. (0-7)</param>
+        /// <param name="value">Bytes to write. If more than 200, multiple requests will be made.</param>
+        public void WriteBit(DataType dataType, int db, int startByteAdr, int bitAdr, bool value)
+        {
+            if (bitAdr < 0 || bitAdr > 7)
+                throw new InvalidAddressException(string.Format("Addressing Error: You can only reference bitwise locations 0-7. Address {0} is invalid", bitAdr));
+
+            WriteBitWithASingleRequest(dataType, db, startByteAdr, bitAdr, value);
+        }
+
+        /// <summary>
+        /// Write a single bit to a DB with the specified index.
+        /// </summary>
+        /// <param name="dataType">Data type of the memory area, can be DB, Timer, Counter, Merker(Memory), Input, Output.</param>
+        /// <param name="db">Address of the memory area (if you want to write DB1, this is set to 1). This must be set also for other memory area types: counters, timers,etc.</param>
+        /// <param name="startByteAdr">Start byte address. If you want to write DB1.DBW200, this is 200.</param>
+        /// <param name="bitAdr">The address of the bit. (0-7)</param>
+        /// <param name="value">Value to write (0 or 1).</param>
+        public void WriteBit(DataType dataType, int db, int startByteAdr, int bitAdr, int value)
+        {
+            if (value < 0 || value > 1)
+                throw new ArgumentException("Value must be 0 or 1", nameof(value));
+
+            WriteBit(dataType, db, startByteAdr, bitAdr, value == 1);
+        }
+
+        /// <summary>
+        /// Takes in input an object and tries to parse it to an array of values. This can be used to write many data, all of the same type.
+        /// You must specify the memory area type, memory are address, byte start address and bytes count.
+        /// If the read was not successful, check LastErrorCode or LastErrorString.
+        /// </summary>
+        /// <param name="dataType">Data type of the memory area, can be DB, Timer, Counter, Merker(Memory), Input, Output.</param>
+        /// <param name="db">Address of the memory area (if you want to read DB1, this is set to 1). This must be set also for other memory area types: counters, timers,etc.</param>
+        /// <param name="startByteAdr">Start byte address. If you want to read DB1.DBW200, this is 200.</param>
+        /// <param name="value">Bytes to write. The lenght of this parameter can't be higher than 200. If you need more, use recursion.</param>
+        /// <param name="bitAdr">The address of the bit. (0-7)</param>
+        public void Write(DataType dataType, int db, int startByteAdr, object value, int bitAdr = -1)
+        {
+            if (bitAdr != -1)
+            {
+                //Must be writing a bit value as bitAdr is specified
+                if (value is bool boolean)
+                {
+                    WriteBit(dataType, db, startByteAdr, bitAdr, boolean);
+                }
+                else if (value is int intValue)
+                {
+                    if (intValue < 0 || intValue > 7)
+                        throw new ArgumentOutOfRangeException(
+                            string.Format(
+                                "Addressing Error: You can only reference bitwise locations 0-7. Address {0} is invalid",
+                                bitAdr), nameof(bitAdr));
+
+                    WriteBit(dataType, db, startByteAdr, bitAdr, intValue == 1);
+                }
+                else
+                    throw new ArgumentException("Value must be a bool or an int to write a bit", nameof(value));
+            }
+            else WriteBytes(dataType, db, startByteAdr, Serialization.SerializeValue(value));
+        }
+
+        /// <summary>
+        /// Writes a single variable from the PLC, takes in input strings like "DB1.DBX0.0", "DB20.DBD200", "MB20", "T45", etc.
+        /// If the write was not successful, check <see cref="LastErrorCode"/> or <see cref="LastErrorString"/>.
+        /// </summary>
+        /// <param name="variable">Input strings like "DB1.DBX0.0", "DB20.DBD200", "MB20", "T45", etc.</param>
+        /// <param name="value">Value to be written to the PLC</param>
+        public void Write(string variable, object value)
+        {
+            var adr = new PLCAddress(variable);
+            Write(adr.DataType, adr.DbNumber, adr.StartByte, value, adr.BitNumber);
+        }
+
+        /// <summary>
+        /// Writes a C# struct to a DB in the PLC
+        /// </summary>
+        /// <param name="structValue">The struct to be written</param>
+        /// <param name="db">Db address</param>
+        /// <param name="startByteAdr">Start bytes on the PLC</param>
+        public void WriteStruct(object structValue, int db, int startByteAdr = 0)
+        {
+            WriteStructAsync(structValue, db, startByteAdr).GetAwaiter().GetResult();
+        }
+
+        /// <summary>
+        /// Writes a C# class to a DB in the PLC
+        /// </summary>
+        /// <param name="classValue">The class to be written</param>
+        /// <param name="db">Db address</param>
+        /// <param name="startByteAdr">Start bytes on the PLC</param>
+        public void WriteClass(object classValue, int db, int startByteAdr = 0)
+        {
+            WriteClassAsync(classValue, db, startByteAdr).GetAwaiter().GetResult();
+        }
+
+        //private void ReadBytesWithSingleRequest(DataType dataType, int db, int startByteAdr, Span<byte> buffer)
+        //{
+        //    try
+        //    {
+        //        // first create the header
+        //        const int packageSize = 19 + 12; // 19 header + 12 for 1 request
+        //        var dataToSend = new byte[packageSize];
+        //        var package = new MemoryStream(dataToSend);
+        //        BuildHeaderPackage(package);
+        //        // package.Add(0x02);  // datenart
+        //        BuildReadDataRequestPackage(package, dataType, db, startByteAdr, buffer.Length);
+
+        //        var s7data = RequestTsdu(dataToSend);
+        //        AssertReadResponse(s7data, buffer.Length);
+
+        //        s7data.AsSpan(18, buffer.Length).CopyTo(buffer);
+        //    }
+        //    catch (Exception exc)
+        //    {
+        //        throw new PlcException(ErrorCode.ReadData, exc);
+        //    }
+        //}
+
+        /// <summary>
+        /// Write DataItem(s) to the PLC. Throws an exception if the response is invalid
+        /// or when the PLC reports errors for item(s) written.
+        /// </summary>
+        /// <param name="dataItems">The DataItem(s) to write to the PLC.</param>
+        public void Write(params DataItem[] dataItems)
+        {
+            AssertPduSizeForWrite(dataItems);
+
+            var message = new ByteArray();
+            var length = S7WriteMultiple.CreateRequest(message, dataItems);
+            var response = RequestTsdu(message.Array, 0, length);
+
+            S7WriteMultiple.ParseResponse(response, response.Length, dataItems);
+        }
+
+        //private void WriteBytesWithASingleRequest(DataType dataType, int db, int startByteAdr, ReadOnlySpan<byte> value)
+        //{
+        //    try
+        //    {
+        //        var dataToSend = BuildWriteBytesPackage(dataType, db, startByteAdr, value);
+        //        var s7data = RequestTsdu(dataToSend);
+
+        //        ValidateResponseCode((ReadWriteErrorCode)s7data[14]);
+        //    }
+        //    catch (Exception exc)
+        //    {
+        //        throw new PlcException(ErrorCode.WriteData, exc);
+        //    }
+        //}
+
+        private byte[] BuildWriteBytesPackage(DataType dataType, int db, int startByteAdr, byte[] value, int dataOffset, int count)
+        {
+            int varCount = count;
+            // first create the header
+            int packageSize = 35 + varCount;
+            var package = new MemoryStream(new byte[packageSize]);
+
+            package.WriteByte(3);
+            package.WriteByte(0);
+            //complete package size
+            package.Write(Int.ToByteArray((short)packageSize));
+            package.Write(new byte[] { 2, 0xf0, 0x80, 0x32, 1, 0, 0 });
+            package.Write(Word.ToByteArray((ushort)(varCount - 1)));
+            package.Write(new byte[] { 0, 0x0e });
+            package.Write(Word.ToByteArray((ushort)(varCount + 4)));
+            package.Write(new byte[] { 0x05, 0x01, 0x12, 0x0a, 0x10, 0x02 });
+            package.Write(Word.ToByteArray((ushort)varCount));
+            package.Write(Word.ToByteArray((ushort)(db)));
+            package.WriteByte((byte)dataType);
+            var overflow = (int)(startByteAdr * 8 / 0xffffU); // handles words with address bigger than 8191
+            package.WriteByte((byte)overflow);
+            package.Write(Word.ToByteArray((ushort)(startByteAdr * 8)));
+            package.Write(new byte[] { 0, 4 });
+            package.Write(Word.ToByteArray((ushort)(varCount * 8)));
+
+            // now join the header and the data
+            package.Write(value, dataOffset, count);
+
+            return package.ToArray();
+        }
+
+        //private byte[] BuildWriteBytesPackage(DataType dataType, int db, int startByteAdr, ReadOnlySpan<byte> value)
+        //{
+        //    int varCount = value.Length;
+        //    // first create the header
+        //    int packageSize = 35 + varCount;
+        //    var packageData = new byte[packageSize];
+        //    var package = new MemoryStream(packageData);
+
+        //    package.WriteByte(3);
+        //    package.WriteByte(0);
+        //    //complete package size
+        //    package.Write(Int.ToByteArray((short)packageSize));
+        //    // This overload doesn't allocate the byte array, it refers to assembly's static data segment
+        //    package.Write(new byte[] { 2, 0xf0, 0x80, 0x32, 1, 0, 0 });
+        //    package.Write(Word.ToByteArray((ushort)(varCount - 1)));
+        //    package.Write(new byte[] { 0, 0x0e });
+        //    package.Write(Word.ToByteArray((ushort)(varCount + 4)));
+        //    package.Write(new byte[] { 0x05, 0x01, 0x12, 0x0a, 0x10, 0x02 });
+        //    package.Write(Word.ToByteArray((ushort)varCount));
+        //    package.Write(Word.ToByteArray((ushort)(db)));
+        //    package.WriteByte((byte)dataType);
+        //    var overflow = (int)(startByteAdr * 8 / 0xffffU); // handles words with address bigger than 8191
+        //    package.WriteByte((byte)overflow);
+        //    package.Write(Word.ToByteArray((ushort)(startByteAdr * 8)));
+        //    package.Write(new byte[] { 0, 4 });
+        //    package.Write(Word.ToByteArray((ushort)(varCount * 8)));
+
+        //    // now join the header and the data
+        //    package.Write(value);
+
+        //    return packageData;
+        //}
+
+        private byte[] BuildWriteBitPackage(DataType dataType, int db, int startByteAdr, bool bitValue, int bitAdr)
+        {
+            var value = new[] { bitValue ? (byte)1 : (byte)0 };
+            int varCount = 1;
+            // first create the header
+            int packageSize = 35 + varCount;
+            var packageData = new byte[packageSize];
+            var package = new MemoryStream(packageData);
+
+            package.WriteByte(3);
+            package.WriteByte(0);
+            //complete package size
+            package.Write(Int.ToByteArray((short)packageSize));
+            package.Write(new byte[] { 2, 0xf0, 0x80, 0x32, 1, 0, 0 });
+            package.Write(Word.ToByteArray((ushort)(varCount - 1)));
+            package.Write(new byte[] { 0, 0x0e });
+            package.Write(Word.ToByteArray((ushort)(varCount + 4)));
+            package.Write(new byte[] { 0x05, 0x01, 0x12, 0x0a, 0x10, 0x01 }); //ending 0x01 is used for writing a sinlge bit
+            package.Write(Word.ToByteArray((ushort)varCount));
+            package.Write(Word.ToByteArray((ushort)(db)));
+            package.WriteByte((byte)dataType);
+            var overflow = (int)(startByteAdr * 8 / 0xffffU); // handles words with address bigger than 8191
+            package.WriteByte((byte)overflow);
+            package.Write(Word.ToByteArray((ushort)(startByteAdr * 8 + bitAdr)));
+            package.Write(new byte[] { 0, 0x03 }); //ending 0x03 is used for writing a sinlge bit
+            package.Write(Word.ToByteArray((ushort)(varCount)));
+
+            // now join the header and the data
+            package.Write(value);
+
+            return packageData;
+        }
+
+        private void WriteBitWithASingleRequest(DataType dataType, int db, int startByteAdr, int bitAdr, bool bitValue)
+        {
+            try
+            {
+                var dataToSend = BuildWriteBitPackage(dataType, db, startByteAdr, bitValue, bitAdr);
+                var s7data = RequestTsdu(dataToSend);
+
+                ValidateResponseCode((ReadWriteErrorCode)s7data[14]);
+            }
+            catch (Exception exc)
+            {
+                throw new PlcException(ErrorCode.WriteData, exc);
+            }
+        }
+
+        /// <summary>
+        /// Reads multiple vars in a single request.
+        /// You have to create and pass a list of DataItems and you obtain in response the same list with the values.
+        /// Values are stored in the property "Value" of the dataItem and are already converted.
+        /// If you don't want the conversion, just create a dataItem of bytes.
+        /// The number of DataItems as well as the total size of the requested data can not exceed a certain limit (protocol restriction).
+        /// </summary>
+        /// <param name="dataItems">List of dataitems that contains the list of variables that must be read.</param>
+        public void ReadMultipleVars(List<DataItem> dataItems)
+        {
+            AssertPduSizeForRead(dataItems);
+
+            try
+            {
+                // first create the header
+                int packageSize = 19 + (dataItems.Count * 12);
+                var dataToSend = new byte[packageSize];
+                var package = new MemoryStream(dataToSend);
+                BuildHeaderPackage(package, dataItems.Count);
+                // package.Add(0x02);  // datenart
+                foreach (var dataItem in dataItems)
+                {
+                    BuildReadDataRequestPackage(package, dataItem.DataType, dataItem.DB, dataItem.StartByteAdr, VarTypeToByteLength(dataItem.VarType, dataItem.Count));
+                }
+
+                byte[] s7data = RequestTsdu(dataToSend);
+
+                ValidateResponseCode((ReadWriteErrorCode)s7data[14]);
+
+                ParseDataIntoDataItems(s7data, dataItems);
+            }
+            catch (Exception exc)
+            {
+                throw new PlcException(ErrorCode.ReadData, exc);
+            }
+        }
+
+        private byte[] RequestTsdu(byte[] requestData) => RequestTsdu(requestData, 0, requestData.Length);
+
+        private byte[] RequestTsdu(byte[] requestData, int offset, int length)
+        {
+            return RequestTsduAsync(requestData, offset, length).GetAwaiter().GetResult();
+        }
+    }
+}

常用工具集/Utility/Network/S7netplus/Protocol/ConnectionRequest.cs

@@ -0,0 +1,28 @@
+namespace S7.Net.Protocol
+{
+    internal static class ConnectionRequest
+    {
+        public static byte[] GetCOTPConnectionRequest(TsapPair tsapPair)
+        {
+            byte[] bSend1 = {
+                    3, 0, 0, 22, //TPKT
+                    17,     //COTP Header Length
+                    224,    //Connect Request
+                    0, 0,   //Destination Reference
+                    0, 46,  //Source Reference
+                    0,      //Flags
+                    193,    //Parameter Code (src-tasp)
+                    2,      //Parameter Length
+                    tsapPair.Local.FirstByte, tsapPair.Local.SecondByte,   //Source TASP
+                    194,    //Parameter Code (dst-tasp)
+                    2,      //Parameter Length
+                    tsapPair.Remote.FirstByte, tsapPair.Remote.SecondByte,   //Destination TASP
+                    192,    //Parameter Code (tpdu-size)
+                    1,      //Parameter Length
+                    10      //TPDU Size (2^10 = 1024)
+                };
+
+            return bSend1;
+        }
+    }
+}

常用工具集/Utility/Network/S7netplus/Protocol/ReadWriteErrorCode.cs

@@ -0,0 +1,15 @@
+
+namespace S7.Net.Protocol
+{
+    internal enum ReadWriteErrorCode : byte
+    {
+        Reserved = 0x00,
+        HardwareFault = 0x01,
+        AccessingObjectNotAllowed = 0x03,
+        AddressOutOfRange = 0x05,
+        DataTypeNotSupported = 0x06,
+        DataTypeInconsistent = 0x07,
+        ObjectDoesNotExist = 0x0a,
+        Success = 0xff
+    }
+}

常用工具集/Utility/Network/S7netplus/Protocol/S7/DataItemAddress.cs

@@ -0,0 +1,37 @@
+namespace S7.Net.Protocol.S7
+{
+    /// <summary>
+    /// Represents an area of memory in the PLC
+    /// </summary>
+    internal class DataItemAddress
+    {
+        public DataItemAddress(DataType dataType, int db, int startByteAddress, int byteLength)
+        {
+            DataType = dataType;
+            DB = db;
+            StartByteAddress = startByteAddress;
+            ByteLength = byteLength;
+        }
+
+
+        /// <summary>
+        /// Memory area to read 
+        /// </summary>
+        public DataType DataType { get; }
+
+        /// <summary>
+        /// Address of memory area to read (example: for DB1 this value is 1, for T45 this value is 45)
+        /// </summary>
+        public int DB { get; }
+
+        /// <summary>
+        /// Address of the first byte to read
+        /// </summary>
+        public int StartByteAddress { get; }
+
+        /// <summary>
+        /// Length of data to read
+        /// </summary>
+        public int ByteLength { get; }
+    }
+}

常用工具集/Utility/Network/S7netplus/Protocol/S7WriteMultiple.cs

@@ -0,0 +1,163 @@
+using System;
+using System.Collections.Generic;
+using S7.Net.Types;
+
+namespace S7.Net.Protocol
+{
+    internal static class S7WriteMultiple
+    {
+        public static int CreateRequest(ByteArray message, DataItem[] dataItems)
+        {
+            message.Add(Header.Template);
+
+            message[Header.Offsets.ParameterCount] = (byte) dataItems.Length;
+            var paramSize = dataItems.Length * Parameter.Template.Length;
+
+            Serialization.SetWordAt(message, Header.Offsets.ParameterSize,
+                (ushort) (2 + paramSize));
+
+            var paramOffset = Header.Template.Length;
+            var data = new ByteArray();
+
+            var itemCount = 0;
+
+            foreach (var item in dataItems)
+            {
+                itemCount++;
+                message.Add(Parameter.Template);
+                var value = Serialization.SerializeDataItem(item);
+                var wordLen = item.Value is bool ? 1 : 2;
+
+                message[paramOffset + Parameter.Offsets.WordLength] = (byte) wordLen;
+                Serialization.SetWordAt(message, paramOffset + Parameter.Offsets.Amount, (ushort) value.Length);
+                Serialization.SetWordAt(message, paramOffset + Parameter.Offsets.DbNumber, (ushort) item.DB);
+                message[paramOffset + Parameter.Offsets.Area] = (byte) item.DataType;
+
+                data.Add(0x00);
+                if (item.Value is bool b)
+                {
+                    if (item.BitAdr > 7)
+                        throw new ArgumentException(
+                            $"Cannot read bit with invalid {nameof(item.BitAdr)} '{item.BitAdr}'.", nameof(dataItems));
+
+                    Serialization.SetAddressAt(message, paramOffset + Parameter.Offsets.Address, item.StartByteAdr,
+                        item.BitAdr);
+
+                    data.Add(0x03);
+                    data.AddWord(1);
+
+                    data.Add(b ? (byte)1 : (byte)0);
+                    if (itemCount != dataItems.Length) { 
+                        data.Add(0);
+                    }
+                }
+                else
+                {
+                    Serialization.SetAddressAt(message, paramOffset + Parameter.Offsets.Address, item.StartByteAdr, 0);
+
+                    var len = value.Length;
+                    data.Add(0x04);
+                    data.AddWord((ushort) (len << 3));
+                    data.Add(value);
+                    
+                    if ((len & 0b1) == 1 && itemCount != dataItems.Length)
+                    {
+                        data.Add(0);
+                    }
+                }
+
+                paramOffset += Parameter.Template.Length;
+            }
+
+            message.Add(data.Array);
+
+            Serialization.SetWordAt(message, Header.Offsets.MessageLength, (ushort) message.Length);
+            Serialization.SetWordAt(message, Header.Offsets.DataLength, (ushort) (message.Length - paramOffset));
+
+            return message.Length;
+        }
+
+        public static void ParseResponse(byte[] message, int length, DataItem[] dataItems)
+        {
+            if (length < 12) throw new Exception("Not enough data received to parse write response.");
+
+            var messageError = Serialization.GetWordAt(message, 10);
+            if (messageError != 0)
+                throw new Exception($"Write failed with error {messageError}.");
+
+            if (length < 14 + dataItems.Length)
+                throw new Exception("Not enough data received to parse individual item responses.");
+
+            IList<byte> itemResults = new ArraySegment<byte>(message, 14, dataItems.Length);
+
+            List<Exception> errors = null;
+
+            for (int i = 0; i < dataItems.Length; i++)
+            {
+                try
+                {
+                    Plc.ValidateResponseCode((ReadWriteErrorCode)itemResults[i]);
+                }
+                catch(Exception e)
+                {
+                    if (errors == null) errors = new List<Exception>();
+                    errors.Add(new Exception($"Write of dataItem {dataItems[i]} failed: {e.Message}."));
+                }
+
+            }
+
+            if (errors != null)
+                throw new AggregateException(
+                    $"Write failed for {errors.Count} items. See the innerExceptions for details.", errors);
+        }
+
+        private static class Header
+        {
+            public static byte[] Template { get; } =
+            {
+                0x03, 0x00, 0x00, 0x00, // TPKT
+                0x02, 0xf0, 0x80, // ISO DT
+                0x32, // S7 protocol ID
+                0x01, // JobRequest
+                0x00, 0x00, // Reserved
+                0x05, 0x00, // PDU reference
+                0x00, 0x0e, // Parameters length
+                0x00, 0x00, // Data length
+                0x05, // Function: Write var
+                0x00, // Number of items to write
+            };
+
+            public static class Offsets
+            {
+                public const int MessageLength = 2;
+                public const int ParameterSize = 13;
+                public const int DataLength = 15;
+                public const int ParameterCount = 18;
+            }
+        }
+
+        private static class Parameter
+        {
+            public static byte[] Template { get; } =
+            {
+                0x12, // Spec
+                0x0a, // Length of remaining bytes
+                0x10, // Addressing mode
+                0x02, // Transport size
+                0x00, 0x00, // Number of elements
+                0x00, 0x00, // DB number
+                0x84, // Area type
+                0x00, 0x00, 0x00 // Area offset
+            };
+
+            public static class Offsets
+            {
+                public const int WordLength = 3;
+                public const int Amount = 4;
+                public const int DbNumber = 6;
+                public const int Area = 8;
+                public const int Address = 9;
+            }
+        }
+    }
+}

常用工具集/Utility/Network/S7netplus/Protocol/Serialization.cs

@@ -0,0 +1,102 @@
+using System;
+using System.Collections.Generic;
+using S7.Net.Types;
+
+namespace S7.Net.Protocol
+{
+    internal static class Serialization
+    {
+        public static ushort GetWordAt(IList<byte> buf, int index)
+        {
+            return (ushort)((buf[index] << 8) + buf[index]);
+        }
+
+        public static byte[] SerializeDataItem(DataItem dataItem)
+        {
+            if (dataItem.Value == null)
+            {
+                throw new Exception($"DataItem.Value is null, cannot serialize. StartAddr={dataItem.StartByteAdr} VarType={dataItem.VarType}");
+            }
+
+            if (dataItem.Value is string s)
+            {
+                switch (dataItem.VarType)
+                {
+                    case VarType.S7String:
+                        return S7String.ToByteArray(s, dataItem.Count);
+                    case VarType.S7WString:
+                        return S7WString.ToByteArray(s, dataItem.Count);
+                    default:
+                        return Types.String.ToByteArray(s, dataItem.Count);
+                }
+            }
+            return SerializeValue(dataItem.Value);
+        }
+
+        public static byte[] SerializeValue(object value)
+        {
+            switch (value.GetType().Name)
+            {
+                case "Boolean":
+                    return new[] { (byte)((bool)value ? 1 : 0) };
+                case "Byte":
+                    return Types.Byte.ToByteArray((byte)value);
+                case "Int16":
+                    return Types.Int.ToByteArray((Int16)value);
+                case "UInt16":
+                    return Types.Word.ToByteArray((UInt16)value);
+                case "Int32":
+                    return Types.DInt.ToByteArray((Int32)value);
+                case "UInt32":
+                    return Types.DWord.ToByteArray((UInt32)value);
+                case "Single":
+                    return Types.Real.ToByteArray((float)value);
+                case "Double":
+                    return Types.LReal.ToByteArray((double)value);
+                case "DateTime":
+                    return Types.DateTime.ToByteArray((System.DateTime)value);
+                case "Byte[]":
+                    return (byte[])value;
+                case "Int16[]":
+                    return Types.Int.ToByteArray((Int16[])value);
+                case "UInt16[]":
+                    return Types.Word.ToByteArray((UInt16[])value);
+                case "Int32[]":
+                    return Types.DInt.ToByteArray((Int32[])value);
+                case "UInt32[]":
+                    return Types.DWord.ToByteArray((UInt32[])value);
+                case "Single[]":
+                    return Types.Real.ToByteArray((float[])value);
+                case "Double[]":
+                    return Types.LReal.ToByteArray((double[])value);
+                case "String":
+                    // Hack: This is backwards compatible with the old code, but functionally it's broken
+                    // if the consumer does not pay attention to string length.
+                    var stringVal = (string)value;
+                    return Types.String.ToByteArray(stringVal, stringVal.Length);
+                case "DateTime[]":
+                    return Types.DateTime.ToByteArray((System.DateTime[])value);
+                case "DateTimeLong[]":
+                    return Types.DateTimeLong.ToByteArray((System.DateTime[])value);
+                default:
+                    throw new InvalidVariableTypeException();
+            }
+        }
+
+        public static void SetAddressAt(ByteArray buffer, int index, int startByte, byte bitNumber)
+        {
+            var start = startByte * 8 + bitNumber;
+            buffer[index + 2] = (byte)start;
+            start >>= 8;
+            buffer[index + 1] = (byte)start;
+            start >>= 8;
+            buffer[index] = (byte)start;
+        }
+
+        public static void SetWordAt(ByteArray buffer, int index, ushort value)
+        {
+            buffer[index] = (byte)(value >> 8);
+            buffer[index + 1] = (byte)value;
+        }
+    }
+}

常用工具集/Utility/Network/S7netplus/Protocol/Tsap.cs

@@ -0,0 +1,31 @@
+namespace S7.Net.Protocol
+{
+    /// <summary>
+    /// Provides a representation of the Transport Service Access Point, or TSAP in short. TSAP's are used
+    /// to specify a client and server address. For most PLC types a default TSAP is available that allows
+    /// connection from any IP and can be calculated using the rack and slot numbers.
+    /// </summary>
+    public struct Tsap
+    {
+        /// <summary>
+        /// First byte of the TSAP.
+        /// </summary>
+        public byte FirstByte { get; set; }
+
+        /// <summary>
+        /// Second byte of the TSAP.
+        /// </summary>
+        public byte SecondByte { get; set; }
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="Tsap" /> class using the specified values.
+        /// </summary>
+        /// <param name="firstByte">The first byte of the TSAP.</param>
+        /// <param name="secondByte">The second byte of the TSAP.</param>
+        public Tsap(byte firstByte, byte secondByte)
+        {
+            FirstByte = firstByte;
+            SecondByte = secondByte;
+        }
+    }
+}

常用工具集/Utility/Network/S7netplus/Protocol/TsapPair.cs

@@ -0,0 +1,96 @@
+using System;
+
+namespace S7.Net.Protocol
+{
+    /// <summary>
+    /// Implements a pair of TSAP addresses used to connect to a PLC.
+    /// </summary>
+    public class TsapPair
+    {
+        /// <summary>
+        /// The local <see cref="Tsap" />.
+        /// </summary>
+        public Tsap Local { get; set; }
+
+        /// <summary>
+        /// The remote <see cref="Tsap" />
+        /// </summary>
+        public Tsap Remote { get; set; }
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="TsapPair" /> class using the specified local and
+        /// remote TSAP.
+        /// </summary>
+        /// <param name="local">The local TSAP.</param>
+        /// <param name="remote">The remote TSAP.</param>
+        public TsapPair(Tsap local, Tsap remote)
+        {
+            Local = local;
+            Remote = remote;
+        }
+
+        /// <summary>
+        /// Builds a <see cref="TsapPair" /> that can be used to connect to a PLC using the default connection
+        /// addresses.
+        /// </summary>
+        /// <remarks>
+        /// The remote TSAP is constructed using <code>new Tsap(0x03, (byte) ((rack &lt;&lt; 5) | slot))</code>.
+        /// </remarks>
+        /// <param name="cpuType">The CPU type of the PLC.</param>
+        /// <param name="rack">The rack of the PLC's network card.</param>
+        /// <param name="slot">The slot of the PLC's network card.</param>
+        /// <returns>A TSAP pair that matches the given parameters.</returns>
+        /// <exception cref="ArgumentOutOfRangeException">The <paramref name="cpuType"/> is invalid.
+        ///
+        /// -or-
+        ///
+        /// The <paramref name="rack"/> parameter is less than 0.
+        ///
+        /// -or-
+        ///
+        /// The <paramref name="rack"/> parameter is greater than 15.
+        ///
+        /// -or-
+        ///
+        /// The <paramref name="slot"/> parameter is less than 0.
+        ///
+        /// -or-
+        ///
+        /// The <paramref name="slot"/> parameter is greater than 15.</exception>
+        public static TsapPair GetDefaultTsapPair(CpuType cpuType, int rack, int slot)
+        {
+            if (rack < 0) throw InvalidRackOrSlot(rack, nameof(rack), "minimum", 0);
+            if (rack > 0x0F) throw InvalidRackOrSlot(rack, nameof(rack), "maximum", 0x0F);
+
+            if (slot < 0) throw InvalidRackOrSlot(slot, nameof(slot), "minimum", 0);
+            if (slot > 0x0F) throw InvalidRackOrSlot(slot, nameof(slot), "maximum", 0x0F);
+
+            switch (cpuType)
+            {
+                case CpuType.S7200:
+                    return new TsapPair(new Tsap(0x10, 0x00), new Tsap(0x10, 0x01));
+                case CpuType.Logo0BA8:
+                    // The actual values are probably on a per-project basis
+                    return new TsapPair(new Tsap(0x01, 0x00), new Tsap(0x01, 0x02));
+                case CpuType.S7200Smart:
+                case CpuType.S71200:
+                case CpuType.S71500:
+                case CpuType.S7300:
+                case CpuType.S7400:
+                    // Testing with S7 1500 shows only the remote TSAP needs to match. This might differ for other
+                    // PLC types.
+                    return new TsapPair(new Tsap(0x01, 0x00), new Tsap(0x03, (byte) ((rack << 5) | slot)));
+                default:
+                    throw new ArgumentOutOfRangeException(nameof(cpuType), "Invalid CPU Type specified");
+            }
+        }
+
+        private static ArgumentOutOfRangeException InvalidRackOrSlot(int value, string name, string extrema,
+            int extremaValue)
+        {
+            return new ArgumentOutOfRangeException(name,
+                $"Invalid {name} value specified (decimal: {value}, hexadecimal: {value:X}), {extrema} value " +
+                $"is {extremaValue} (decimal) or {extremaValue:X} (hexadecimal).");
+        }
+    }
+}

常用工具集/Utility/Network/S7netplus/S7Helper.cs

@@ -0,0 +1,301 @@
+using System;
+using System.Text;
+using S7.Net;
+using S7.Net.Types;
+
+namespace MES.Utility.Network.S7netplus
+{
+    public class S7Helper : IDisposable
+    {
+        private object _lock = new object();
+        private Plc plc;
+        public S7Helper(CpuType cpuType, string ipAddress) : this(cpuType, ipAddress, 0, 1)
+        {
+        }
+
+        public S7Helper(CpuType cpuType, string ipAddress, short rack, short slot)
+        {
+            plc = new Plc(cpuType, ipAddress, 102, rack, slot);
+            plc.Open(1000);
+        }
+
+        #region BOOL类型读写 
+        /// <summary>
+        /// 写入BOOL
+        /// </summary>
+        /// <param name="address">例如：DB45.DBX52.0</param>
+        /// <param name="value">true/false</param>
+        /// <returns></returns>
+        public bool WriteBool(string address, bool value)
+        {
+            lock (_lock)
+                try
+                {
+
+                    plc.Write(address, value);
+                    return true;
+                }
+                catch
+                {
+                    return false;
+                }
+        }
+
+        /// <summary>
+        /// 读取bool类型
+        /// </summary> 
+        /// <param name="address">例如：DB45.DBX52.0</param>
+        /// <param name="value">输出bool值</param>
+        /// <returns>返回false 读取失败，PLC通信异常</returns>
+        public bool ReadBool(string address, out bool value)
+        {
+            lock (_lock)
+                try
+                {
+                    value = (bool)plc.Read(address);
+                    return true;
+                }
+                catch
+                {
+                    value = false;
+                    return false;
+                }
+        }
+        #endregion
+
+        #region INT16读写
+        public bool ReadInt16(string address, out ushort value)
+        {
+            lock (_lock)
+                try
+                {
+                    value = (ushort)plc.Read(address);
+                    return true;
+                }
+                catch
+                {
+                    value = 0;
+                    return false;
+                }
+        }
+        public bool WriteInt16(string address, ushort value)
+        {
+            lock (_lock)
+                try
+                {
+                    plc.Write(address, value);
+                    return true;
+                }
+                catch
+                {
+                    return false;
+                }
+        }
+        #endregion
+
+        #region REAL读写
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <param name="address">例如 DB1.DBD4.0</param>
+        /// <param name="value"></param>
+        /// <returns></returns>
+        public bool ReadSingle(string address, out float value)
+        {
+            lock (_lock)
+                try
+                {
+                    value = ((uint)plc.Read(address)).ConvertToFloat();
+                    return true;
+                }
+                catch
+                {
+                    value = 0;
+                    return false;
+                }
+        }
+
+        public bool ReadBytes(int db, int address, int count, out byte[] value)
+        {
+            try
+            {
+                value = plc.ReadBytes(DataType.DataBlock, db, address, count);
+                return true;
+            }
+            catch
+            {
+                value = null;
+                return false;
+            }
+        }
+
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <param name="address">例如 DB1.DBD4.0</param>
+        /// <param name="value"></param>
+        /// <returns></returns>
+        public bool WriteSingle(string address, float value)
+        {
+            lock (_lock)
+                try
+                {
+                    plc.Write(address, value);
+                    return true;
+                }
+                catch
+                {
+                    return false;
+                }
+        }
+        #endregion
+
+        #region String读写
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <param name="address">例如DB45.DBX52.0</param>
+        /// <param name="strLength">字符串长度</param>
+        /// <param name="value">返回字符串数据</param>
+        /// <returns></returns>
+        public bool ReadString(string address, int strLength, out string value)
+        {
+            lock (_lock)
+                try
+                {
+                    string[] array = address.Split('.');
+                    int db = Convert.ToInt32(array[0].Replace("DB", ""));
+                    int startAddress = Convert.ToInt32(array[1].Replace("DBX", ""));
+                    value = (string)plc.Read(DataType.DataBlock, db, startAddress, VarType.S7String, strLength);//获取对应长度的字符串
+                    return true;
+                }
+                catch
+                {
+                    value = "";
+                    return false;
+                }
+        }
+
+        /// <summary>
+        /// 写入字符串
+        /// </summary> 
+        /// <param name="address">例如DB45.DBX52.0</param>
+        /// <param name="value">写入数据</param>
+        /// <param name="value">写入长度</param>
+        /// <returns></returns>
+        public bool WriteString(string address, string value, int strLength)
+        {
+            lock (_lock)
+                try
+                {
+                    //转换address,取到DB  和  开始地址
+                    string[] array = address.Split('.');
+                    int db = Convert.ToInt32(array[0].Replace("DB", ""));
+                    int startAddress = Convert.ToInt32(array[1].Replace("DBX", ""));
+                    var bytes = S7.Net.Types.S7String.ToByteArray(value, strLength);
+                    plc.WriteBytes(DataType.DataBlock, db, startAddress, bytes);
+                    return true;
+                }
+                catch
+                {
+                    return false;
+                }
+
+        }
+        #endregion
+
+
+        public bool ReadBytesString(string address, int strLength, out string value)
+        {
+            lock (_lock)
+                try
+                {
+                    string[] array = address.Split('.');
+                    int db = Convert.ToInt32(array[0].Replace("DB", ""));
+                    int startAddress = Convert.ToInt32(array[1].Replace("DBX", ""));
+                    byte[] values = plc.ReadBytes(DataType.DataBlock, db, startAddress, strLength);
+                    value = Encoding.ASCII.GetString(values);
+                    return true;
+                }
+                catch
+                {
+                    value = "";
+                    return false;
+                }
+        }
+
+        /// <summary>
+        /// 写入字符串
+        /// </summary> 
+        /// <param name="address">例如DB45.DBX52.0</param>
+        /// <param name="value">写入数据</param>
+        /// <param name="value">写入长度</param>
+        /// <returns></returns>
+        public bool WriteBytesString(string address, string value, int strLength)
+        {
+            lock (_lock)
+                try
+                {
+                    //转换address,取到DB  和  开始地址
+                    string[] array = address.Split('.');
+                    int db = Convert.ToInt32(array[0].Replace("DB", ""));
+                    int startAddress = Convert.ToInt32(array[1].Replace("DBX", ""));
+                    var bytes = Encoding.ASCII.GetBytes(value);
+                    if (bytes.Length > strLength) throw new ArgumentException($"The provided string length ({bytes.Length} is larger than the specified reserved length ({strLength}).");
+                    var buffer = new byte[strLength];
+                    Array.Copy(bytes, 0, buffer, 0, bytes.Length);
+                    plc.WriteBytes(DataType.DataBlock, db, startAddress, buffer);
+                    return true;
+                }
+                catch
+                {
+                    return false;
+                }
+
+        }
+
+        #region INT32读写
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <param name="address">例如：DB1.DBD264.0</param>
+        /// <param name="value"></param>
+        /// <returns></returns>
+        public bool ReadInt32(string address, out int value)
+        {
+            lock (_lock)
+                try
+                {
+                    value = (int)plc.Read(address);
+                    return true;
+                }
+                catch
+                {
+                    value = 0;
+                    return false;
+                }
+        }
+        public bool WriteInt32(string address, int value)
+        {
+            lock (_lock)
+                try
+                {
+                    plc.Write(address, value);
+                    return true;
+                }
+                catch
+                {
+                    return false;
+                }
+        }
+
+        #endregion
+
+        public void Dispose()
+        {
+            plc?.Close();
+            plc = null;
+        }
+    }
+
+}

常用工具集/Utility/Network/S7netplus/StreamExtensions.cs

@@ -0,0 +1,57 @@
+using System;
+using System.IO;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace S7.Net
+{
+    /// <summary>
+    /// Extensions for Streams
+    /// </summary>
+    public static class StreamExtensions
+    {
+        /// <summary>
+        /// Reads bytes from the stream into the buffer until exactly the requested number of bytes (or EOF) have been read
+        /// </summary>
+        /// <param name="stream">the Stream to read from</param>
+        /// <param name="buffer">the buffer to read into</param>
+        /// <param name="offset">the offset in the buffer to read into</param>
+        /// <param name="count">the amount of bytes to read into the buffer</param>
+        /// <returns>returns the amount of read bytes</returns>
+        public static int ReadExact(this Stream stream, byte[] buffer, int offset, int count)
+        {
+            int read = 0;
+            int received;
+            do
+            {
+                received = stream.Read(buffer, offset + read, count - read);
+                read += received;
+            }
+            while (read < count && received > 0);
+
+            return read;
+        }
+
+        /// <summary>
+        /// Reads bytes from the stream into the buffer until exactly the requested number of bytes (or EOF) have been read
+        /// </summary>
+        /// <param name="stream">the Stream to read from</param>
+        /// <param name="buffer">the buffer to read into</param>
+        /// <param name="offset">the offset in the buffer to read into</param>
+        /// <param name="count">the amount of bytes to read into the buffer</param>
+        /// <returns>returns the amount of read bytes</returns>
+        public static async Task<int> ReadExactAsync(this Stream stream, byte[] buffer, int offset, int count, CancellationToken cancellationToken)
+        {
+            int read = 0;
+            int received;
+            do
+            {
+                received = await stream.ReadAsync(buffer, offset + read, count - read, cancellationToken).ConfigureAwait(false);
+                read += received;
+            }
+            while (read < count && received > 0);
+
+            return read;
+        }
+    }
+}

常用工具集/Utility/Network/S7netplus/TPKT.cs

@@ -0,0 +1,66 @@
+using System;
+using System.IO;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace S7.Net
+{
+
+    /// <summary>
+    /// Describes a TPKT Packet
+    /// </summary>
+    internal class TPKT
+    {
+
+
+        public byte Version;
+        public byte Reserved1;
+        public int Length;
+        public byte[] Data;
+        private TPKT(byte version, byte reserved1, int length, byte[] data)
+        {
+            Version = version;
+            Reserved1 = reserved1;
+            Length = length;
+            Data = data;
+        }
+
+        /// <summary>
+        /// Reads a TPKT from the socket Async
+        /// </summary>
+        /// <param name="stream">The stream to read from</param>
+        /// <returns>Task TPKT Instace</returns>
+        public static async Task<TPKT> ReadAsync(Stream stream, CancellationToken cancellationToken)
+        {
+            var buf = new byte[4];
+            int len = await stream.ReadExactAsync(buf, 0, 4, cancellationToken).ConfigureAwait(false);
+            if (len < 4) throw new TPKTInvalidException("TPKT is incomplete / invalid");
+
+            var version = buf[0];
+            var reserved1 = buf[1];
+            var length = buf[2] * 256 + buf[3]; //BigEndian
+
+            var data = new byte[length - 4];
+            len = await stream.ReadExactAsync(data, 0, data.Length, cancellationToken).ConfigureAwait(false);
+            if (len < data.Length)
+                throw new TPKTInvalidException("TPKT payload incomplete / invalid");
+
+            return new TPKT
+            (
+                version: version,
+                reserved1: reserved1,
+                length: length,
+                data: data
+            );
+        }
+
+        public override string ToString()
+        {
+            return string.Format("Version: {0} Length: {1} Data: {2}",
+                Version,
+                Length,
+                BitConverter.ToString(Data)
+                );
+        }
+    }
+}

常用工具集/Utility/Network/S7netplus/Types/Bit.cs

@@ -0,0 +1,43 @@
+using System;
+using System.Collections;
+
+namespace S7.Net.Types
+{
+    /// <summary>
+    /// Contains the conversion methods to convert Bit from S7 plc to C#.
+    /// </summary>
+    public static class Bit
+    {
+        /// <summary>
+        /// Converts a Bit to bool
+        /// </summary>
+        public static bool FromByte(byte v, byte bitAdr)
+        {
+            return (((int)v & (1 << bitAdr)) != 0);
+        }
+
+        /// <summary>
+        /// Converts an array of bytes to a BitArray.
+        /// </summary>
+        /// <param name="bytes">The bytes to convert.</param>
+        /// <returns>A BitArray with the same number of bits and equal values as <paramref name="bytes"/>.</returns>
+        public static BitArray ToBitArray(byte[] bytes) => ToBitArray(bytes, bytes.Length * 8);
+
+        /// <summary>
+        /// Converts an array of bytes to a BitArray.
+        /// </summary>
+        /// <param name="bytes">The bytes to convert.</param>
+        /// <param name="length">The number of bits to return.</param>
+        /// <returns>A BitArray with <paramref name="length"/> bits.</returns>
+        public static BitArray ToBitArray(byte[] bytes, int length)
+        {
+            if (length > bytes.Length * 8) throw new ArgumentException($"Not enough data in bytes to return {length} bits.", nameof(bytes));
+
+            var bitArr = new BitArray(bytes);
+            var bools = new bool[length];
+            for (var i = 0; i < length; i++) bools[i] = bitArr[i];
+
+            return new BitArray(bools);
+        }
+    }
+}

常用工具集/Utility/Network/S7netplus/Types/Boolean.cs

@@ -0,0 +1,64 @@
+namespace S7.Net.Types
+{
+    /// <summary>
+    /// Contains the methods to read, set and reset bits inside bytes
+    /// </summary>
+    public static class Boolean
+    {
+        /// <summary>
+        /// Returns the value of a bit in a bit, given the address of the bit
+        /// </summary>
+        public static bool GetValue(byte value, int bit)
+        {
+            return (((int)value & (1 << bit)) != 0);
+        }
+
+        /// <summary>
+        /// Sets the value of a bit to 1 (true), given the address of the bit. Returns
+        /// a copy of the value with the bit set.
+        /// </summary>
+        /// <param name="value">The input value to modify.</param>
+        /// <param name="bit">The index (zero based) of the bit to set.</param>
+        /// <returns>The modified value with the bit at index set.</returns>
+        public static byte SetBit(byte value, int bit)
+        {
+            SetBit(ref value, bit);
+
+            return value;
+        }
+
+        /// <summary>
+        /// Sets the value of a bit to 1 (true), given the address of the bit.
+        /// </summary>
+        /// <param name="value">The value to modify.</param>
+        /// <param name="bit">The index (zero based) of the bit to set.</param>
+        public static void SetBit(ref byte value, int bit)
+        {
+            value = (byte) ((value | (1 << bit)) & 0xFF);
+        }
+
+        /// <summary>
+        /// Resets the value of a bit to 0 (false), given the address of the bit. Returns
+        /// a copy of the value with the bit cleared.
+        /// </summary>
+        /// <param name="value">The input value to modify.</param>
+        /// <param name="bit">The index (zero based) of the bit to clear.</param>
+        /// <returns>The modified value with the bit at index cleared.</returns>
+        public static byte ClearBit(byte value, int bit)
+        {
+            ClearBit(ref value, bit);
+
+            return value;
+        }
+
+        /// <summary>
+        /// Resets the value of a bit to 0 (false), given the address of the bit
+        /// </summary>
+        /// <param name="value">The input value to modify.</param>
+        /// <param name="bit">The index (zero based) of the bit to clear.</param>
+        public static void ClearBit(ref byte value, int bit)
+        {
+            value = (byte) (value & ~(1 << bit) & 0xFF);
+        }
+    }
+}

常用工具集/Utility/Network/S7netplus/Types/Byte.cs

@@ -0,0 +1,33 @@
+using System;
+
+namespace S7.Net.Types
+{
+    /// <summary>
+    /// Contains the methods to convert from bytes to byte arrays
+    /// </summary>
+    public static class Byte
+    {
+        /// <summary>
+        /// Converts a byte to byte array
+        /// </summary>
+        public static byte[] ToByteArray(byte value)
+        {
+            return new byte[] { value }; ;
+        }
+       
+        /// <summary>
+        /// Converts a byte array to byte
+        /// </summary>
+        /// <param name="bytes"></param>
+        /// <returns></returns>
+        public static byte FromByteArray(byte[] bytes)
+        {
+            if (bytes.Length != 1)
+            {
+                throw new ArgumentException("Wrong number of bytes. Bytes array must contain 1 bytes.");
+            }
+            return bytes[0];
+        }
+        
+    }
+}

常用工具集/Utility/Network/S7netplus/Types/ByteArray.cs

@@ -0,0 +1,63 @@
+using System.Collections.Generic;
+
+namespace S7.Net.Types
+{
+    class ByteArray
+    {
+        List<byte> list = new List<byte>();
+
+        public byte this[int index]
+        {
+            get => list[index];
+            set => list[index] = value;
+        }
+
+        public byte[] Array
+        {
+            get { return list.ToArray(); }
+        }
+
+        public int Length => list.Count;
+
+        public ByteArray()
+        {
+            list = new List<byte>();
+        }
+
+        public ByteArray(int size)
+        {
+            list = new List<byte>(size);
+        }
+        
+        public void Clear()
+        {
+            list = new List<byte>();
+        }
+
+        public void Add(byte item)
+        {
+            list.Add(item);
+        }
+
+        public void AddWord(ushort value)
+        {
+            list.Add((byte) (value >> 8));
+            list.Add((byte) value);
+        }
+
+        public void Add(byte[] items)
+        {
+            list.AddRange(items);
+        }
+
+        public void Add(IEnumerable<byte> items)
+        {
+            list.AddRange(items);
+        }
+
+        public void Add(ByteArray byteArray)
+        {
+            list.AddRange(byteArray.Array);
+        }
+    }
+}

常用工具集/Utility/Network/S7netplus/Types/Class.cs

@@ -0,0 +1,354 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Reflection;
+using System.Runtime.InteropServices;
+
+namespace S7.Net.Types
+{
+    /// <summary>
+    /// Contains the methods to convert a C# class to S7 data types
+    /// </summary>
+    public static class Class
+    {
+        private static IEnumerable<PropertyInfo> GetAccessableProperties(Type classType)
+        {
+            return classType
+                .GetProperties(
+                    BindingFlags.SetProperty |
+                    BindingFlags.Public |
+                    BindingFlags.Instance)
+                .Where(p => p.GetSetMethod() != null);
+        }
+
+        private static double GetIncreasedNumberOfBytes(double numBytes, Type type, PropertyInfo propertyInfo)
+        {
+            switch (type.Name)
+            {
+                case "Boolean":
+                    numBytes += 0.125;
+                    break;
+                case "Byte":
+                    numBytes = Math.Ceiling(numBytes);
+                    numBytes++;
+                    break;
+                case "Int16":
+                case "UInt16":
+                    IncrementToEven(ref numBytes);
+                    numBytes += 2;
+                    break;
+                case "Int32":
+                case "UInt32":
+                    IncrementToEven(ref numBytes);
+                    numBytes += 4;
+                    break;
+                case "Single":
+                    IncrementToEven(ref numBytes);
+                    numBytes += 4;
+                    break;
+                case "Double":
+                    IncrementToEven(ref numBytes);
+                    numBytes += 8;
+                    break;
+                case "String":
+                    S7StringAttribute attribute = propertyInfo?.GetCustomAttributes<S7StringAttribute>().SingleOrDefault();
+                    if (attribute == default(S7StringAttribute))
+                        throw new ArgumentException("Please add S7StringAttribute to the string field");
+
+                    IncrementToEven(ref numBytes);
+                    numBytes += attribute.ReservedLengthInBytes;
+                    break;
+                default:
+                    var propertyClass = Activator.CreateInstance(type);
+                    numBytes = GetClassSize(propertyClass, numBytes, true);
+                    break;
+            }
+
+            return numBytes;
+        }
+
+        /// <summary>
+        /// Gets the size of the class in bytes.
+        /// </summary>
+        /// <param name="instance">An instance of the class</param>
+        /// <returns>the number of bytes</returns>
+        public static double GetClassSize(object instance, double numBytes = 0.0, bool isInnerProperty = false)
+        {
+            var properties = GetAccessableProperties(instance.GetType());
+            foreach (var property in properties)
+            {
+                if (property.PropertyType.IsArray)
+                {
+                    Type elementType = property.PropertyType.GetElementType();
+                    Array array = (Array)property.GetValue(instance, null);
+                    if (array.Length <= 0)
+                    {
+                        throw new Exception("Cannot determine size of class, because an array is defined which has no fixed size greater than zero.");
+                    }
+
+                    IncrementToEven(ref numBytes);
+                    for (int i = 0; i < array.Length; i++)
+                    {
+                        numBytes = GetIncreasedNumberOfBytes(numBytes, elementType, property);
+                    }
+                }
+                else
+                {
+                    numBytes = GetIncreasedNumberOfBytes(numBytes, property.PropertyType, property);
+                }
+            }
+            if (false == isInnerProperty)
+            {
+                // enlarge numBytes to next even number because S7-Structs in a DB always will be resized to an even byte count
+                numBytes = Math.Ceiling(numBytes);
+                if ((numBytes / 2 - Math.Floor(numBytes / 2.0)) > 0)
+                    numBytes++;
+            }
+            return numBytes;
+        }
+
+        private static object GetPropertyValue(Type propertyType, PropertyInfo propertyInfo, byte[] bytes, ref double numBytes)
+        {
+            object value = null;
+
+            switch (propertyType.Name)
+            {
+                case "Boolean":
+                    // get the value
+                    int bytePos = (int)Math.Floor(numBytes);
+                    int bitPos = (int)((numBytes - (double)bytePos) / 0.125);
+                    if ((bytes[bytePos] & (int)Math.Pow(2, bitPos)) != 0)
+                        value = true;
+                    else
+                        value = false;
+                    numBytes += 0.125;
+                    break;
+                case "Byte":
+                    numBytes = Math.Ceiling(numBytes);
+                    value = (byte)(bytes[(int)numBytes]);
+                    numBytes++;
+                    break;
+                case "Int16":
+                    IncrementToEven(ref numBytes);
+                    // hier auswerten
+                    ushort source = Word.FromBytes(bytes[(int)numBytes + 1], bytes[(int)numBytes]);
+                    value = source.ConvertToShort();
+                    numBytes += 2;
+                    break;
+                case "UInt16":
+                    IncrementToEven(ref numBytes);
+                    // hier auswerten
+                    value = Word.FromBytes(bytes[(int)numBytes + 1], bytes[(int)numBytes]);
+                    numBytes += 2;
+                    break;
+                case "Int32":
+                    IncrementToEven(ref numBytes);
+                    var wordBuffer = new byte[4];
+                    Array.Copy(bytes, (int)numBytes, wordBuffer, 0, wordBuffer.Length);
+                    uint sourceUInt = DWord.FromByteArray(wordBuffer);
+                    value = sourceUInt.ConvertToInt();
+                    numBytes += 4;
+                    break;
+                case "UInt32":
+                    IncrementToEven(ref numBytes);
+                    var wordBuffer2 = new byte[4];
+                    Array.Copy(bytes, (int)numBytes, wordBuffer2, 0, wordBuffer2.Length);
+                    value = DWord.FromByteArray(wordBuffer2);
+                    numBytes += 4;
+                    break;
+                case "Single":
+                    IncrementToEven(ref numBytes);
+                    // hier auswerten
+                    value = Real.FromByteArray(
+                        new byte[] {
+                            bytes[(int)numBytes],
+                            bytes[(int)numBytes + 1],
+                            bytes[(int)numBytes + 2],
+                            bytes[(int)numBytes + 3] });
+                    numBytes += 4;
+                    break;
+                case "Double":
+                    IncrementToEven(ref numBytes);
+                    var buffer = new byte[8];
+                    Array.Copy(bytes, (int)numBytes, buffer, 0, 8);
+                    // hier auswerten
+                    value = LReal.FromByteArray(buffer);
+                    numBytes += 8;
+                    break;
+                case "String":
+                    S7StringAttribute attribute = propertyInfo?.GetCustomAttributes<S7StringAttribute>().SingleOrDefault();
+                    if (attribute == default(S7StringAttribute))
+                        throw new ArgumentException("Please add S7StringAttribute to the string field");
+
+                    IncrementToEven(ref numBytes);
+
+                    // get the value
+                    var sData = new byte[attribute.ReservedLengthInBytes];
+                    Array.Copy(bytes, (int)numBytes, sData, 0, sData.Length);
+                    switch (attribute.Type)
+                    {
+                        case S7StringType.S7String:
+                            value = S7String.FromByteArray(sData); break;
+                        case S7StringType.S7WString:
+                            value = S7WString.FromByteArray(sData); break;
+                        default:
+                            throw new ArgumentException("Please use a valid string type for the S7StringAttribute");
+                    }
+                    numBytes += sData.Length;
+                    break;
+                default:
+                    var propClass = Activator.CreateInstance(propertyType);
+                    numBytes = FromBytes(propClass, bytes, numBytes);
+                    value = propClass;
+                    break;
+            }
+
+            return value;
+        }
+
+        /// <summary>
+        /// Sets the object's values with the given array of bytes
+        /// </summary>
+        /// <param name="sourceClass">The object to fill in the given array of bytes</param>
+        /// <param name="bytes">The array of bytes</param>
+        public static double FromBytes(object sourceClass, byte[] bytes, double numBytes = 0, bool isInnerClass = false)
+        {
+            if (bytes == null)
+                return numBytes;
+
+            var properties = GetAccessableProperties(sourceClass.GetType());
+            foreach (var property in properties)
+            {
+                if (property.PropertyType.IsArray)
+                {
+                    Array array = (Array)property.GetValue(sourceClass, null);
+                    IncrementToEven(ref numBytes);
+                    Type elementType = property.PropertyType.GetElementType();
+                    for (int i = 0; i < array.Length && numBytes < bytes.Length; i++)
+                    {
+                        array.SetValue(
+                            GetPropertyValue(elementType, property, bytes, ref numBytes),
+                            i);
+                    }
+                }
+                else
+                {
+                    property.SetValue(
+                        sourceClass,
+                        GetPropertyValue(property.PropertyType, property, bytes, ref numBytes),
+                        null);
+                }
+            }
+
+            return numBytes;
+        }
+
+        private static double SetBytesFromProperty(object propertyValue, PropertyInfo propertyInfo, byte[] bytes, double numBytes)
+        {
+            int bytePos = 0;
+            int bitPos = 0;
+            byte[] bytes2 = null;
+
+            switch (propertyValue.GetType().Name)
+            {
+                case "Boolean":
+                    // get the value
+                    bytePos = (int)Math.Floor(numBytes);
+                    bitPos = (int)((numBytes - (double)bytePos) / 0.125);
+                    if ((bool)propertyValue)
+                        bytes[bytePos] |= (byte)Math.Pow(2, bitPos);            // is true
+                    else
+                        bytes[bytePos] &= (byte)(~(byte)Math.Pow(2, bitPos));   // is false
+                    numBytes += 0.125;
+                    break;
+                case "Byte":
+                    numBytes = (int)Math.Ceiling(numBytes);
+                    bytePos = (int)numBytes;
+                    bytes[bytePos] = (byte)propertyValue;
+                    numBytes++;
+                    break;
+                case "Int16":
+                    bytes2 = Int.ToByteArray((Int16)propertyValue);
+                    break;
+                case "UInt16":
+                    bytes2 = Word.ToByteArray((UInt16)propertyValue);
+                    break;
+                case "Int32":
+                    bytes2 = DInt.ToByteArray((Int32)propertyValue);
+                    break;
+                case "UInt32":
+                    bytes2 = DWord.ToByteArray((UInt32)propertyValue);
+                    break;
+                case "Single":
+                    bytes2 = Real.ToByteArray((float)propertyValue);
+                    break;
+                case "Double":
+                    bytes2 = LReal.ToByteArray((double)propertyValue);
+                    break;
+                case "String":
+                    S7StringAttribute attribute = propertyInfo?.GetCustomAttributes<S7StringAttribute>().SingleOrDefault();
+                    if (attribute == default(S7StringAttribute))
+                        throw new ArgumentException("Please add S7StringAttribute to the string field");
+                    switch (attribute.Type)
+                    {
+                        case S7StringType.S7String:
+                            bytes2 = S7String.ToByteArray((string)propertyValue, attribute.ReservedLength); break;
+                        case S7StringType.S7WString:
+                            bytes2 = S7WString.ToByteArray((string)propertyValue, attribute.ReservedLength); break;
+                        default:
+                            throw new ArgumentException("Please use a valid string type for the S7StringAttribute");
+                    }
+                    break;
+                default:
+                    numBytes = ToBytes(propertyValue, bytes, numBytes);
+                    break;
+            }
+
+            if (bytes2 != null)
+            {
+                IncrementToEven(ref numBytes);
+
+                bytePos = (int)numBytes;
+                for (int bCnt = 0; bCnt < bytes2.Length; bCnt++)
+                    bytes[bytePos + bCnt] = bytes2[bCnt];
+                numBytes += bytes2.Length;
+            }
+
+            return numBytes;
+        }
+
+        /// <summary>
+        /// Creates a byte array depending on the struct type.
+        /// </summary>
+        /// <param name="sourceClass">The struct object</param>
+        /// <returns>A byte array or null if fails.</returns>
+        public static double ToBytes(object sourceClass, byte[] bytes, double numBytes = 0.0)
+        {
+            var properties = GetAccessableProperties(sourceClass.GetType());
+            foreach (var property in properties)
+            {
+                if (property.PropertyType.IsArray)
+                {
+                    Array array = (Array)property.GetValue(sourceClass, null);
+                    IncrementToEven(ref numBytes);
+                    Type elementType = property.PropertyType.GetElementType();
+                    for (int i = 0; i < array.Length && numBytes < bytes.Length; i++)
+                    {
+                        numBytes = SetBytesFromProperty(array.GetValue(i), property, bytes, numBytes);
+                    }
+                }
+                else
+                {
+                    numBytes = SetBytesFromProperty(property.GetValue(sourceClass, null), property, bytes, numBytes);
+                }
+            }
+            return numBytes;
+        }
+
+        private static void IncrementToEven(ref double numBytes)
+        {
+            numBytes = Math.Ceiling(numBytes);
+            if (numBytes % 2 > 0) numBytes++;
+        }
+    }
+}

常用工具集/Utility/Network/S7netplus/Types/Counter.cs

@@ -0,0 +1,63 @@
+using System;
+
+namespace S7.Net.Types
+{
+    /// <summary>
+    /// Contains the conversion methods to convert Counter from S7 plc to C# ushort (UInt16).
+    /// </summary>
+    public static class Counter
+    {
+        /// <summary>
+        /// Converts a Counter (2 bytes) to ushort (UInt16)
+        /// </summary>
+        public static UInt16 FromByteArray(byte[] bytes)
+        {
+            if (bytes.Length != 2)
+            {
+                throw new ArgumentException("Wrong number of bytes. Bytes array must contain 2 bytes.");
+            }
+            // bytes[0] -> HighByte
+            // bytes[1] -> LowByte
+            return (UInt16)((bytes[0] << 8) | bytes[1]);
+        }
+
+
+        /// <summary>
+        /// Converts a ushort (UInt16) to word (2 bytes)
+        /// </summary>
+        public static byte[] ToByteArray(UInt16 value)
+        {
+            byte[] bytes = new byte[2];
+
+            bytes[0] = (byte)((value << 8) & 0xFF);
+            bytes[1] = (byte)((value) & 0xFF);
+            
+            return bytes;
+        }
+
+        /// <summary>
+        /// Converts an array of ushort (UInt16) to an array of bytes
+        /// </summary>
+        public static byte[] ToByteArray(UInt16[] value)
+        {
+            ByteArray arr = new ByteArray();
+            foreach (UInt16 val in value)
+                arr.Add(ToByteArray(val));
+            return arr.Array;
+        }
+
+        /// <summary>
+        /// Converts an array of bytes to an array of ushort
+        /// </summary>
+        public static UInt16[] ToArray(byte[] bytes)
+        {
+            UInt16[] values = new UInt16[bytes.Length / 2];
+
+            int counter = 0;
+            for (int cnt = 0; cnt < bytes.Length / 2; cnt++)
+                values[cnt] = FromByteArray(new byte[] { bytes[counter++], bytes[counter++] });
+
+            return values;
+        }
+    }
+}

常用工具集/Utility/Network/S7netplus/Types/DInt.cs

@@ -0,0 +1,65 @@
+using System;
+
+namespace S7.Net.Types
+{
+    /// <summary>
+    /// Contains the conversion methods to convert DInt from S7 plc to C# int (Int32).
+    /// </summary>
+    public static class DInt
+    {
+        /// <summary>
+        /// Converts a S7 DInt (4 bytes) to int (Int32)
+        /// </summary>
+        public static Int32 FromByteArray(byte[] bytes)
+        {
+            if (bytes.Length != 4)
+            {
+                throw new ArgumentException("Wrong number of bytes. Bytes array must contain 4 bytes.");
+            }
+            return bytes[0] << 24 | bytes[1] << 16 | bytes[2] << 8 | bytes[3];
+        }
+
+
+        /// <summary>
+        /// Converts a int (Int32) to S7 DInt (4 bytes)
+        /// </summary>
+        public static byte[] ToByteArray(Int32 value)
+        {
+            byte[] bytes = new byte[4];
+
+            bytes[0] = (byte)((value >> 24) & 0xFF);
+            bytes[1] = (byte)((value >> 16) & 0xFF);
+            bytes[2] = (byte)((value >> 8) & 0xFF);
+            bytes[3] = (byte)((value) & 0xFF);
+
+            return bytes;
+        }
+
+        /// <summary>
+        /// Converts an array of int (Int32) to an array of bytes
+        /// </summary>
+        public static byte[] ToByteArray(Int32[] value)
+        {
+            ByteArray arr = new ByteArray();
+            foreach (Int32 val in value)
+                arr.Add(ToByteArray(val));
+            return arr.Array;
+        }
+
+        /// <summary>
+        /// Converts an array of S7 DInt to an array of int (Int32)
+        /// </summary>
+        public static Int32[] ToArray(byte[] bytes)
+        {
+            Int32[] values = new Int32[bytes.Length / 4];
+
+            int counter = 0;
+            for (int cnt = 0; cnt < bytes.Length / 4; cnt++)
+                values[cnt] = FromByteArray(new byte[] { bytes[counter++], bytes[counter++], bytes[counter++], bytes[counter++] });
+
+            return values;
+        }
+        
+
+    }
+}

常用工具集/Utility/Network/S7netplus/Types/DWord.cs

@@ -0,0 +1,73 @@
+using System;
+
+namespace S7.Net.Types
+{
+    /// <summary>
+    /// Contains the conversion methods to convert DWord from S7 plc to C#.
+    /// </summary>
+    public static class DWord
+    {
+        /// <summary>
+        /// Converts a S7 DWord (4 bytes) to uint (UInt32)
+        /// </summary>
+        public static UInt32 FromByteArray(byte[] bytes)
+        {
+            return (UInt32)(bytes[0] << 24 | bytes[1] << 16 | bytes[2] << 8 | bytes[3]);
+        }
+
+
+        /// <summary>
+        /// Converts 4 bytes to DWord (UInt32)
+        /// </summary>
+        public static UInt32 FromBytes(byte b1, byte b2, byte b3, byte b4)
+        {
+            return (UInt32)((b4 << 24) | (b3 << 16) | (b2 << 8) | b1);
+        }
+
+
+        /// <summary>
+        /// Converts a uint (UInt32) to S7 DWord (4 bytes) 
+        /// </summary>
+        public static byte[] ToByteArray(UInt32 value)
+        {
+            byte[] bytes = new byte[4];
+
+            bytes[0] = (byte)((value >> 24) & 0xFF);
+            bytes[1] = (byte)((value >> 16) & 0xFF);
+            bytes[2] = (byte)((value >> 8) & 0xFF);
+            bytes[3] = (byte)((value) & 0xFF);
+
+            return bytes;
+        }
+
+
+
+
+
+
+        /// <summary>
+        /// Converts an array of uint (UInt32) to an array of S7 DWord (4 bytes) 
+        /// </summary>
+        public static byte[] ToByteArray(UInt32[] value)
+        {
+            ByteArray arr = new ByteArray();
+            foreach (UInt32 val in value)
+                arr.Add(ToByteArray(val));
+            return arr.Array;
+        }
+
+        /// <summary>
+        /// Converts an array of S7 DWord to an array of uint (UInt32)
+        /// </summary>
+        public static UInt32[] ToArray(byte[] bytes)
+        {
+            UInt32[] values = new UInt32[bytes.Length / 4];
+
+            int counter = 0;
+            for (int cnt = 0; cnt < bytes.Length / 4; cnt++)
+                values[cnt] = FromByteArray(new byte[] { bytes[counter++], bytes[counter++], bytes[counter++], bytes[counter++] });
+
+            return values;
+        }
+    }
+}

常用工具集/Utility/Network/S7netplus/Types/DataItem.cs

@@ -0,0 +1,104 @@
+using S7.Net.Protocol.S7;
+using System;
+
+namespace S7.Net.Types
+{
+    /// <summary>
+    /// Create an instance of a memory block that can be read by using ReadMultipleVars
+    /// </summary>
+    public class DataItem
+    {
+        /// <summary>
+        /// Memory area to read 
+        /// </summary>
+        public DataType DataType { get; set; }
+
+        /// <summary>
+        /// Type of data to be read (default is bytes)
+        /// </summary>
+        public VarType VarType { get; set; }
+
+        /// <summary>
+        /// Address of memory area to read (example: for DB1 this value is 1, for T45 this value is 45)
+        /// </summary>
+        public int DB { get; set; }
+
+        /// <summary>
+        /// Address of the first byte to read
+        /// </summary>
+        public int StartByteAdr { get; set; }
+
+        /// <summary>
+        /// Addess of bit to read from StartByteAdr
+        /// </summary>
+        public byte BitAdr { get; set; }
+
+        /// <summary>
+        /// Number of variables to read
+        /// </summary>
+        public int Count { get; set; }
+
+        /// <summary>
+        /// Contains the value of the memory area after the read has been executed
+        /// </summary>
+        public object Value { get; set; }
+
+        /// <summary>
+        /// Create an instance of DataItem
+        /// </summary>
+        public DataItem()
+        {
+            VarType = VarType.Byte;
+            Count = 1;
+        }
+
+        /// <summary>
+        /// Create an instance of <see cref="DataItem"/> from the supplied address.
+        /// </summary>
+        /// <param name="address">The address to create the DataItem for.</param>
+        /// <returns>A new <see cref="DataItem"/> instance with properties parsed from <paramref name="address"/>.</returns>
+        /// <remarks>The <see cref="Count" /> property is not parsed from the address.</remarks>
+        public static DataItem FromAddress(string address)
+        {
+            PLCAddress.Parse(address, out var dataType, out var dbNumber, out var varType, out var startByte,
+                out var bitNumber);
+
+            return new DataItem
+            {
+                DataType = dataType,
+                DB = dbNumber,
+                VarType = varType,
+                StartByteAdr = startByte,
+                BitAdr = (byte)(bitNumber == -1 ? 0 : bitNumber)
+            };
+        }
+
+        /// <summary>
+        /// Create an instance of <see cref="DataItem"/> from the supplied address and value.
+        /// </summary>
+        /// <param name="address">The address to create the DataItem for.</param>
+        /// <param name="value">The value to be applied to the DataItem.</param>
+        /// <returns>A new <see cref="DataItem"/> instance with properties parsed from <paramref name="address"/> and the supplied value set.</returns>
+        public static DataItem FromAddressAndValue<T>(string address, T value)
+        {
+            var dataItem = FromAddress(address);
+            dataItem.Value = value;
+
+            if (typeof(T).IsArray)
+            {
+                var array = ((Array)dataItem.Value);
+                if (array != null)
+                {
+                    dataItem.Count = array.Length;
+                }
+            }
+
+            return dataItem;
+        }
+
+        internal static DataItemAddress GetDataItemAddress(DataItem dataItem)
+        {
+            return new DataItemAddress(dataItem.DataType, dataItem.DB, dataItem.StartByteAdr, Plc.VarTypeToByteLength(dataItem.VarType, dataItem.Count));
+        }
+    }
+}

常用工具集/Utility/Network/S7netplus/Types/DateTime.cs

@@ -0,0 +1,156 @@
+using System;
+using System.Collections.Generic;
+
+namespace S7.Net.Types
+{
+    /// <summary>
+    /// Contains the methods to convert between <see cref="T:System.DateTime"/> and S7 representation of datetime values.
+    /// </summary>
+    public static class DateTime
+    {
+        /// <summary>
+        /// The minimum <see cref="T:System.DateTime"/> value supported by the specification.
+        /// </summary>
+        public static readonly System.DateTime SpecMinimumDateTime = new System.DateTime(1990, 1, 1);
+
+        /// <summary>
+        /// The maximum <see cref="T:System.DateTime"/> value supported by the specification.
+        /// </summary>
+        public static readonly System.DateTime SpecMaximumDateTime = new System.DateTime(2089, 12, 31, 23, 59, 59, 999);
+
+        /// <summary>
+        /// Parses a <see cref="T:System.DateTime"/> value from bytes.
+        /// </summary>
+        /// <param name="bytes">Input bytes read from PLC.</param>
+        /// <returns>A <see cref="T:System.DateTime"/> object representing the value read from PLC.</returns>
+        /// <exception cref="ArgumentOutOfRangeException">Thrown when the length of
+        ///   <paramref name="bytes"/> is not 8 or any value in <paramref name="bytes"/>
+        ///   is outside the valid range of values.</exception>
+        public static System.DateTime FromByteArray(byte[] bytes)
+        {
+            return FromByteArrayImpl(bytes);
+        }
+
+        /// <summary>
+        /// Parses an array of <see cref="T:System.DateTime"/> values from bytes.
+        /// </summary>
+        /// <param name="bytes">Input bytes read from PLC.</param>
+        /// <returns>An array of <see cref="T:System.DateTime"/> objects representing the values read from PLC.</returns>
+        /// <exception cref="ArgumentOutOfRangeException">Thrown when the length of
+        ///   <paramref name="bytes"/> is not a multiple of 8 or any value in
+        ///   <paramref name="bytes"/> is outside the valid range of values.</exception>
+        public static System.DateTime[] ToArray(byte[] bytes)
+        {
+            if (bytes.Length % 8 != 0)
+                throw new ArgumentOutOfRangeException(nameof(bytes), bytes.Length,
+                    $"Parsing an array of DateTime requires a multiple of 8 bytes of input data, input data is '{bytes.Length}' long.");
+
+            var cnt = bytes.Length / 8;
+            var result = new System.DateTime[bytes.Length / 8];
+
+            for (var i = 0; i < cnt; i++)
+                result[i] = FromByteArrayImpl(new ArraySegment<byte>(bytes, i * 8, 8));
+
+            return result;
+        }
+
+        private static System.DateTime FromByteArrayImpl(IList<byte> bytes)
+        {
+            if (bytes.Count != 8)
+                throw new ArgumentOutOfRangeException(nameof(bytes), bytes.Count,
+                    $"Parsing a DateTime requires exactly 8 bytes of input data, input data is {bytes.Count} bytes long.");
+
+            int DecodeBcd(byte input) => 10 * (input >> 4) + (input & 0b00001111);
+
+            int ByteToYear(byte bcdYear)
+            {
+                var input = DecodeBcd(bcdYear);
+                if (input < 90) return input + 2000;
+                if (input < 100) return input + 1900;
+
+                throw new ArgumentOutOfRangeException(nameof(bcdYear), bcdYear,
+                    $"Value '{input}' is higher than the maximum '99' of S7 date and time representation.");
+            }
+
+            int AssertRangeInclusive(int input, byte min, byte max, string field)
+            {
+                if (input < min)
+                    throw new ArgumentOutOfRangeException(nameof(input), input,
+                        $"Value '{input}' is lower than the minimum '{min}' allowed for {field}.");
+                if (input > max)
+                    throw new ArgumentOutOfRangeException(nameof(input), input,
+                        $"Value '{input}' is higher than the maximum '{max}' allowed for {field}.");
+
+                return input;
+            }
+
+            var year = ByteToYear(bytes[0]);
+            var month = AssertRangeInclusive(DecodeBcd(bytes[1]), 1, 12, "month");
+            var day = AssertRangeInclusive(DecodeBcd(bytes[2]), 1, 31, "day of month");
+            var hour = AssertRangeInclusive(DecodeBcd(bytes[3]), 0, 23, "hour");
+            var minute = AssertRangeInclusive(DecodeBcd(bytes[4]), 0, 59, "minute");
+            var second = AssertRangeInclusive(DecodeBcd(bytes[5]), 0, 59, "second");
+            var hsec = AssertRangeInclusive(DecodeBcd(bytes[6]), 0, 99, "first two millisecond digits");
+            var msec = AssertRangeInclusive(bytes[7] >> 4, 0, 9, "third millisecond digit");
+            var dayOfWeek = AssertRangeInclusive(bytes[7] & 0b00001111, 1, 7, "day of week");
+
+            return new System.DateTime(year, month, day, hour, minute, second, hsec * 10 + msec);
+        }
+
+        /// <summary>
+        /// Converts a <see cref="T:System.DateTime"/> value to a byte array.
+        /// </summary>
+        /// <param name="dateTime">The DateTime value to convert.</param>
+        /// <returns>A byte array containing the S7 date time representation of <paramref name="dateTime"/>.</returns>
+        /// <exception cref="ArgumentOutOfRangeException">Thrown when the value of
+        ///   <paramref name="dateTime"/> is before <see cref="P:SpecMinimumDateTime"/>
+        ///   or after <see cref="P:SpecMaximumDateTime"/>.</exception>
+        public static byte[] ToByteArray(System.DateTime dateTime)
+        {
+            byte EncodeBcd(int value)
+            {
+                return (byte) ((value / 10 << 4) | value % 10);
+            }
+
+            if (dateTime < SpecMinimumDateTime)
+                throw new ArgumentOutOfRangeException(nameof(dateTime), dateTime,
+                    $"Date time '{dateTime}' is before the minimum '{SpecMinimumDateTime}' supported in S7 date time representation.");
+
+            if (dateTime > SpecMaximumDateTime)
+                throw new ArgumentOutOfRangeException(nameof(dateTime), dateTime,
+                    $"Date time '{dateTime}' is after the maximum '{SpecMaximumDateTime}' supported in S7 date time representation.");
+
+            byte MapYear(int year) => (byte) (year < 2000 ? year - 1900 : year - 2000);
+
+            int DayOfWeekToInt(DayOfWeek dayOfWeek) => (int) dayOfWeek + 1;
+
+            return new[]
+            {
+                EncodeBcd(MapYear(dateTime.Year)),
+                EncodeBcd(dateTime.Month),
+                EncodeBcd(dateTime.Day),
+                EncodeBcd(dateTime.Hour),
+                EncodeBcd(dateTime.Minute),
+                EncodeBcd(dateTime.Second),
+                EncodeBcd(dateTime.Millisecond / 10),
+                (byte) (dateTime.Millisecond % 10 << 4 | DayOfWeekToInt(dateTime.DayOfWeek))
+            };
+        }
+
+        /// <summary>
+        /// Converts an array of <see cref="T:System.DateTime"/> values to a byte array.
+        /// </summary>
+        /// <param name="dateTimes">The DateTime values to convert.</param>
+        /// <returns>A byte array containing the S7 date time representations of <paramref name="dateTime"/>.</returns>
+        /// <exception cref="ArgumentOutOfRangeException">Thrown when any value of
+        ///   <paramref name="dateTimes"/> is before <see cref="P:SpecMinimumDateTime"/>
+        ///   or after <see cref="P:SpecMaximumDateTime"/>.</exception>
+        public static byte[] ToByteArray(System.DateTime[] dateTimes)
+        {
+            var bytes = new List<byte>(dateTimes.Length * 8);
+            foreach (var dateTime in dateTimes) bytes.AddRange(ToByteArray(dateTime));
+
+            return bytes.ToArray();
+        }
+    }
+}

常用工具集/Utility/Network/S7netplus/Types/DateTimeLong.cs

@@ -0,0 +1,185 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+
+namespace S7.Net.Types
+{
+    /// <summary>
+    /// Contains the methods to convert between <see cref="T:System.DateTime" /> and S7 representation of DateTimeLong (DTL) values.
+    /// </summary>
+    public static class DateTimeLong
+    {
+        public const int TypeLengthInBytes = 12;
+        /// <summary>
+        /// The minimum <see cref="T:System.DateTime" /> value supported by the specification.
+        /// </summary>
+        public static readonly System.DateTime SpecMinimumDateTime = new System.DateTime(1970, 1, 1);
+
+        /// <summary>
+        /// The maximum <see cref="T:System.DateTime" /> value supported by the specification.
+        /// </summary>
+        public static readonly System.DateTime SpecMaximumDateTime = new System.DateTime(2262, 4, 11, 23, 47, 16, 854);
+
+        /// <summary>
+        /// Parses a <see cref="T:System.DateTime" /> value from bytes.
+        /// </summary>
+        /// <param name="bytes">Input bytes read from PLC.</param>
+        /// <returns>A <see cref="T:System.DateTime" /> object representing the value read from PLC.</returns>
+        /// <exception cref="ArgumentOutOfRangeException">
+        /// Thrown when the length of
+        /// <paramref name="bytes" /> is not 12 or any value in <paramref name="bytes" />
+        /// is outside the valid range of values.
+        /// </exception>
+        public static System.DateTime FromByteArray(byte[] bytes)
+        {
+            return FromByteArrayImpl(bytes);
+        }
+
+        /// <summary>
+        /// Parses an array of <see cref="T:System.DateTime" /> values from bytes.
+        /// </summary>
+        /// <param name="bytes">Input bytes read from PLC.</param>
+        /// <returns>An array of <see cref="T:System.DateTime" /> objects representing the values read from PLC.</returns>
+        /// <exception cref="ArgumentOutOfRangeException">
+        /// Thrown when the length of
+        /// <paramref name="bytes" /> is not a multiple of 12 or any value in
+        /// <paramref name="bytes" /> is outside the valid range of values.
+        /// </exception>
+        public static System.DateTime[] ToArray(byte[] bytes)
+        {
+            if (bytes.Length % TypeLengthInBytes != 0)
+            {
+                throw new ArgumentOutOfRangeException(nameof(bytes), bytes.Length,
+                    $"Parsing an array of DateTimeLong requires a multiple of 12 bytes of input data, input data is '{bytes.Length}' long.");
+            }
+
+            var cnt = bytes.Length / TypeLengthInBytes;
+            var result = new System.DateTime[cnt];
+
+            for (var i = 0; i < cnt; i++)
+            {
+                var slice = new byte[TypeLengthInBytes];
+                Array.Copy(bytes, i * TypeLengthInBytes, slice, 0, TypeLengthInBytes);
+                result[i] = FromByteArrayImpl(slice);
+            }
+
+            return result;
+        }
+
+        private static System.DateTime FromByteArrayImpl(byte[] bytes)
+        {
+            if (bytes.Length != TypeLengthInBytes)
+            {
+                throw new ArgumentOutOfRangeException(nameof(bytes), bytes.Length,
+                    $"Parsing a DateTimeLong requires exactly 12 bytes of input data, input data is {bytes.Length} bytes long.");
+            }
+
+
+            var year = AssertRangeInclusive(Word.FromBytes(bytes[1], bytes[0]), 1970, 2262, "year");
+            var month = AssertRangeInclusive(bytes[2], 1, 12, "month");
+            var day = AssertRangeInclusive(bytes[3], 1, 31, "day of month");
+            var dayOfWeek = AssertRangeInclusive(bytes[4], 1, 7, "day of week");
+            var hour = AssertRangeInclusive(bytes[5], 0, 23, "hour");
+            var minute = AssertRangeInclusive(bytes[6], 0, 59, "minute");
+            var second = AssertRangeInclusive(bytes[7], 0, 59, "second");
+            ;
+
+            var nanoseconds = AssertRangeInclusive<uint>(DWord.FromBytes(bytes[11], bytes[10], bytes[9], bytes[8]), 0,
+                999999999, "nanoseconds");
+
+            var time = new System.DateTime(year, month, day, hour, minute, second);
+            return time.AddTicks(nanoseconds / 100);
+        }
+
+        /// <summary>
+        /// Converts a <see cref="T:System.DateTime" /> value to a byte array.
+        /// </summary>
+        /// <param name="dateTime">The DateTime value to convert.</param>
+        /// <returns>A byte array containing the S7 DateTimeLong representation of <paramref name="dateTime" />.</returns>
+        /// <exception cref="ArgumentOutOfRangeException">
+        /// Thrown when the value of
+        /// <paramref name="dateTime" /> is before <see cref="P:SpecMinimumDateTime" />
+        /// or after <see cref="P:SpecMaximumDateTime" />.
+        /// </exception>
+        public static byte[] ToByteArray(System.DateTime dateTime)
+        {
+            if (dateTime < SpecMinimumDateTime)
+            {
+                throw new ArgumentOutOfRangeException(nameof(dateTime), dateTime,
+                    $"Date time '{dateTime}' is before the minimum '{SpecMinimumDateTime}' supported in S7 DateTimeLong representation.");
+            }
+
+            if (dateTime > SpecMaximumDateTime)
+            {
+                throw new ArgumentOutOfRangeException(nameof(dateTime), dateTime,
+                    $"Date time '{dateTime}' is after the maximum '{SpecMaximumDateTime}' supported in S7 DateTimeLong representation.");
+            }
+
+            var stream = new MemoryStream(TypeLengthInBytes);
+            // Convert Year
+            stream.Write(Word.ToByteArray(Convert.ToUInt16(dateTime.Year)), 0, 2);
+
+            // Convert Month
+            stream.WriteByte(Convert.ToByte(dateTime.Month));
+
+            // Convert Day
+            stream.WriteByte(Convert.ToByte(dateTime.Day));
+
+            // Convert WeekDay. NET DateTime starts with Sunday = 0, while S7DT has Sunday = 1.
+            stream.WriteByte(Convert.ToByte(dateTime.DayOfWeek + 1));
+
+            // Convert Hour
+            stream.WriteByte(Convert.ToByte(dateTime.Hour));
+
+            // Convert Minutes
+            stream.WriteByte(Convert.ToByte(dateTime.Minute));
+
+            // Convert Seconds
+            stream.WriteByte(Convert.ToByte(dateTime.Second));
+
+            // Convert Nanoseconds. Net DateTime has a representation of 1 Tick = 100ns.
+            // Thus First take the ticks Mod 1 Second (1s = 10'000'000 ticks), and then Convert to nanoseconds.
+            stream.Write(DWord.ToByteArray(Convert.ToUInt32(dateTime.Ticks % 10000000 * 100)), 0, 4);
+
+            return stream.ToArray();
+        }
+
+        /// <summary>
+        /// Converts an array of <see cref="T:System.DateTime" /> values to a byte array.
+        /// </summary>
+        /// <param name="dateTimes">The DateTime values to convert.</param>
+        /// <returns>A byte array containing the S7 DateTimeLong representations of <paramref name="dateTimes" />.</returns>
+        /// <exception cref="ArgumentOutOfRangeException">
+        /// Thrown when any value of
+        /// <paramref name="dateTimes" /> is before <see cref="P:SpecMinimumDateTime" />
+        /// or after <see cref="P:SpecMaximumDateTime" />.
+        /// </exception>
+        public static byte[] ToByteArray(System.DateTime[] dateTimes)
+        {
+            var bytes = new List<byte>(dateTimes.Length * TypeLengthInBytes);
+            foreach (var dateTime in dateTimes)
+            {
+                bytes.AddRange(ToByteArray(dateTime));
+            }
+
+            return bytes.ToArray();
+        }
+
+        private static T AssertRangeInclusive<T>(T input, T min, T max, string field) where T : IComparable<T>
+        {
+            if (input.CompareTo(min) < 0)
+            {
+                throw new ArgumentOutOfRangeException(nameof(input), input,
+                    $"Value '{input}' is lower than the minimum '{min}' allowed for {field}.");
+            }
+
+            if (input.CompareTo(max) > 0)
+            {
+                throw new ArgumentOutOfRangeException(nameof(input), input,
+                    $"Value '{input}' is higher than the maximum '{max}' allowed for {field}.");
+            }
+
+            return input;
+        }
+    }
+}

常用工具集/Utility/Network/S7netplus/Types/Double.cs

@@ -0,0 +1,68 @@
+using System;
+
+namespace S7.Net.Types
+{
+    /// <summary>
+    /// Contains the conversion methods to convert Real from S7 plc to C# double.
+    /// </summary>
+    [Obsolete("Class Double is obsolete. Use Real instead for 32bit floating point, or LReal for 64bit floating point.")]
+    public static class Double
+    {
+        /// <summary>
+        /// Converts a S7 Real (4 bytes) to double
+        /// </summary>
+        public static double FromByteArray(byte[] bytes) => Real.FromByteArray(bytes);
+
+        /// <summary>
+        /// Converts a S7 DInt to double
+        /// </summary>
+        public static double FromDWord(Int32 value)
+        {
+            byte[] b = DInt.ToByteArray(value);
+            double d = FromByteArray(b);
+            return d;
+        }
+
+        /// <summary>
+        /// Converts a S7 DWord to double
+        /// </summary>
+        public static double FromDWord(UInt32 value)
+        {
+            byte[] b = DWord.ToByteArray(value);
+            double d = FromByteArray(b);
+            return d;
+        }
+
+
+        /// <summary>
+        /// Converts a double to S7 Real (4 bytes)
+        /// </summary>
+        public static byte[] ToByteArray(double value) => Real.ToByteArray((float)value);
+
+        /// <summary>
+        /// Converts an array of double to an array of bytes 
+        /// </summary>
+        public static byte[] ToByteArray(double[] value)
+        {
+            ByteArray arr = new ByteArray();
+            foreach (double val in value)
+                arr.Add(ToByteArray(val));
+            return arr.Array;
+        }
+
+        /// <summary>
+        /// Converts an array of S7 Real to an array of double
+        /// </summary>
+        public static double[] ToArray(byte[] bytes)
+        {
+            double[] values = new double[bytes.Length / 4];
+
+            int counter = 0;
+            for (int cnt = 0; cnt < bytes.Length / 4; cnt++)
+                values[cnt] = FromByteArray(new byte[] { bytes[counter++], bytes[counter++], bytes[counter++], bytes[counter++] });
+
+            return values;
+        }
+        
+    }
+}

常用工具集/Utility/Network/S7netplus/Types/Int.cs

@@ -0,0 +1,87 @@
+using System;
+
+namespace S7.Net.Types
+{
+    /// <summary>
+    /// Contains the conversion methods to convert Int from S7 plc to C#.
+    /// </summary>
+    public static class Int
+    {
+        /// <summary>
+        /// Converts a S7 Int (2 bytes) to short (Int16)
+        /// </summary>
+        public static short FromByteArray(byte[] bytes)
+        {
+            if (bytes.Length != 2)
+            {
+                throw new ArgumentException("Wrong number of bytes. Bytes array must contain 2 bytes.");
+            }
+            // bytes[0] -> HighByte
+            // bytes[1] -> LowByte
+            return (short)((int)(bytes[1]) | ((int)(bytes[0]) << 8));
+        }
+
+
+        /// <summary>
+        /// Converts a short (Int16) to a S7 Int byte array (2 bytes)
+        /// </summary>
+        public static byte[] ToByteArray(Int16 value)
+        {
+            byte[] bytes = new byte[2];
+
+            bytes[0] = (byte) (value >> 8 & 0xFF);
+            bytes[1] = (byte)(value & 0xFF);
+
+            return bytes;
+        }
+
+        /// <summary>
+        /// Converts an array of short (Int16) to a S7 Int byte array (2 bytes)
+        /// </summary>
+        public static byte[] ToByteArray(Int16[] value)
+        {
+            byte[] bytes = new byte[value.Length * 2];
+            int bytesPos = 0;
+
+            for(int i=0; i< value.Length; i++)
+            {
+                bytes[bytesPos++] = (byte)((value[i] >> 8) & 0xFF);
+                bytes[bytesPos++] = (byte) (value[i] & 0xFF);
+            }
+            return bytes;
+        }
+
+        /// <summary>
+        /// Converts an array of S7 Int to an array of short (Int16)
+        /// </summary>
+        public static Int16[] ToArray(byte[] bytes)
+        {
+            int shortsCount = bytes.Length / 2;
+
+            Int16[] values = new Int16[shortsCount];
+
+            int counter = 0;
+            for (int cnt = 0; cnt < shortsCount; cnt++)
+                values[cnt] = FromByteArray(new byte[] { bytes[counter++], bytes[counter++] });
+
+            return values;
+        }
+        
+        /// <summary>
+        /// Converts a C# int value to a C# short value, to be used as word.
+        /// </summary>
+        /// <param name="value"></param>
+        /// <returns></returns>
+        public static Int16 CWord(int value)
+        {
+            if (value > 32767)
+            {
+                value -= 32768;
+                value = 32768 - value;
+                value *= -1;
+            }
+            return (short)value;
+        }
+
+    }
+}

常用工具集/Utility/Network/S7netplus/Types/LReal.cs

@@ -0,0 +1,57 @@
+using System;
+using System.IO;
+
+namespace S7.Net.Types
+{
+    /// <summary>
+    /// Contains the conversion methods to convert Real from S7 plc to C# double.
+    /// </summary>
+    public static class LReal
+    {
+        /// <summary>
+        /// Converts a S7 LReal (8 bytes) to double
+        /// </summary>
+        public static double FromByteArray(byte[] bytes)
+        {
+            if (bytes.Length != 8)
+            {
+                throw new ArgumentException("Wrong number of bytes. Bytes array must contain 8 bytes.");
+            }
+            var buffer = bytes;
+
+            // sps uses bigending so we have to reverse if platform needs
+            if (BitConverter.IsLittleEndian)
+            {
+                Array.Reverse(buffer);
+            }
+
+            return BitConverter.ToDouble(buffer, 0);
+        }
+
+        /// <summary>
+        /// Converts a double to S7 LReal (8 bytes)
+        /// </summary>
+        public static byte[] ToByteArray(double value)
+        {
+            var bytes = BitConverter.GetBytes(value);
+
+            // sps uses bigending so we have to check if platform is same
+            if (BitConverter.IsLittleEndian)
+            {
+                Array.Reverse(bytes);
+            }
+            return bytes;
+        }
+
+        /// <summary>
+        /// Converts an array of double to an array of bytes 
+        /// </summary>
+        public static byte[] ToByteArray(double[] value) => TypeHelper.ToByteArray(value, ToByteArray);
+
+        /// <summary>
+        /// Converts an array of S7 LReal to an array of double
+        /// </summary>
+        public static double[] ToArray(byte[] bytes) => TypeHelper.ToArray(bytes, FromByteArray);
+        
+    }
+}

常用工具集/Utility/Network/S7netplus/Types/Real.cs

@@ -0,0 +1,75 @@
+using System;
+using System.IO;
+
+namespace S7.Net.Types
+{
+    /// <summary>
+    /// Contains the conversion methods to convert Real from S7 plc to C# double.
+    /// </summary>
+    public static class Real
+    {
+        /// <summary>
+        /// Converts a S7 Real (4 bytes) to float
+        /// </summary>
+        public static float FromByteArray(byte[] bytes)
+        {
+            if (bytes.Length != 4)
+            {
+                throw new ArgumentException("Wrong number of bytes. Bytes array must contain 4 bytes.");
+            }
+
+            // sps uses bigending so we have to reverse if platform needs
+            if (BitConverter.IsLittleEndian)
+            {
+                // create deep copy of the array and reverse
+                bytes = new byte[] { bytes[3], bytes[2], bytes[1], bytes[0] };
+            }
+
+            return BitConverter.ToSingle(bytes, 0);
+        }
+
+        /// <summary>
+        /// Converts a float to S7 Real (4 bytes)
+        /// </summary>
+        public static byte[] ToByteArray(float value)
+        {
+            byte[] bytes = BitConverter.GetBytes(value);
+
+            // sps uses bigending so we have to check if platform is same
+            if (!BitConverter.IsLittleEndian) return bytes;
+            
+            // create deep copy of the array and reverse
+            return new byte[] { bytes[3], bytes[2], bytes[1], bytes[0] };
+        }
+
+        /// <summary>
+        /// Converts an array of float to an array of bytes 
+        /// </summary>
+        public static byte[] ToByteArray(float[] value)
+        {
+            var buffer = new byte[4 * value.Length];
+            var stream = new MemoryStream(buffer);
+            foreach (var val in value)
+            {
+                stream.Write(ToByteArray(val), 0, 4);
+            }
+
+            return buffer;
+        }
+
+        /// <summary>
+        /// Converts an array of S7 Real to an array of float
+        /// </summary>
+        public static float[] ToArray(byte[] bytes)
+        {
+            var values = new float[bytes.Length / 4];
+
+            int counter = 0;
+            for (int cnt = 0; cnt < bytes.Length / 4; cnt++)
+                values[cnt] = FromByteArray(new byte[] { bytes[counter++], bytes[counter++], bytes[counter++], bytes[counter++] });
+
+            return values;
+        }
+        
+    }
+}

常用工具集/Utility/Network/S7netplus/Types/S7String.cs

@@ -0,0 +1,80 @@
+using System;
+using System.Text;
+
+namespace S7.Net.Types
+{
+    /// <summary>
+    /// Contains the methods to convert from S7 strings to C# strings
+    /// An S7 String has a preceeding 2 byte header containing its capacity and length
+    /// </summary>
+    public static class S7String
+    {
+        private static Encoding stringEncoding = Encoding.ASCII;
+
+        /// <summary>
+        /// The Encoding used when serializing and deserializing S7String (Encoding.ASCII by default)
+        /// </summary>
+        /// <exception cref="ArgumentNullException">StringEncoding must not be null</exception>
+        public static Encoding StringEncoding
+        {
+            get => stringEncoding;
+            set => stringEncoding = value ?? throw new ArgumentNullException(nameof(StringEncoding));
+        }
+
+        /// <summary>
+        /// Converts S7 bytes to a string
+        /// </summary>
+        /// <param name="bytes"></param>
+        /// <returns></returns>
+        public static string FromByteArray(byte[] bytes)
+        {
+            if (bytes.Length < 2)
+            {
+                throw new PlcException(ErrorCode.ReadData, "Malformed S7 String / too short");
+            }
+
+            int size = bytes[0];
+            int length = bytes[1];
+            if (length > size)
+            {
+                throw new PlcException(ErrorCode.ReadData, "Malformed S7 String / length larger than capacity");
+            }
+
+            try
+            {
+                return StringEncoding.GetString(bytes, 2, length);
+            }
+            catch (Exception e)
+            {
+                throw new PlcException(ErrorCode.ReadData,
+                    $"Failed to parse {VarType.S7String} from data. Following fields were read: size: '{size}', actual length: '{length}', total number of bytes (including header): '{bytes.Length}'.",
+                    e);
+            }
+        }
+
+        /// <summary>
+        /// Converts a <see cref="T:string"/> to S7 string with 2-byte header.
+        /// </summary>
+        /// <param name="value">The string to convert to byte array.</param>
+        /// <param name="reservedLength">The length (in characters) allocated in PLC for the string.</param>
+        /// <returns>A <see cref="T:byte[]" /> containing the string header and string value with a maximum length of <paramref name="reservedLength"/> + 2.</returns>
+        public static byte[] ToByteArray(string value, int reservedLength)
+        {
+            if (value is null)
+            {
+                throw new ArgumentNullException(nameof(value));
+            }
+
+            if (reservedLength > 254) throw new ArgumentException($"The maximum string length supported is 254.");
+
+            var bytes = StringEncoding.GetBytes(value);
+            if (bytes.Length > reservedLength) throw new ArgumentException($"The provided string length ({bytes.Length} is larger than the specified reserved length ({reservedLength}).");
+
+            var buffer = new byte[2 + reservedLength];
+            Array.Copy(bytes, 0, buffer, 2, bytes.Length);
+            buffer[0] = (byte)reservedLength;
+            buffer[1] = (byte)bytes.Length;
+            return buffer;
+        }
+    }
+}

常用工具集/Utility/Network/S7netplus/Types/S7StringAttribute.cs

@@ -0,0 +1,67 @@
+using System;
+
+namespace S7.Net.Types
+{
+    [AttributeUsage(AttributeTargets.Field | AttributeTargets.Property, AllowMultiple = false)]
+    public sealed class S7StringAttribute : Attribute
+    {
+        private readonly S7StringType type;
+        private readonly int reservedLength;
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="S7StringAttribute"/> class.
+        /// </summary>
+        /// <param name="type">The string type.</param>
+        /// <param name="reservedLength">Reserved length of the string in characters.</param>
+        /// <exception cref="ArgumentException">Please use a valid value for the string type</exception>
+        public S7StringAttribute(S7StringType type, int reservedLength)
+        {
+            if (!Enum.IsDefined(typeof(S7StringType), type))
+                throw new ArgumentException("Please use a valid value for the string type");
+
+            this.type = type;
+            this.reservedLength = reservedLength;
+        }
+
+        /// <summary>
+        /// Gets the type of the string.
+        /// </summary>
+        /// <value>
+        /// The string type.
+        /// </value>
+        public S7StringType Type => type;
+
+        /// <summary>
+        /// Gets the reserved length of the string in characters.
+        /// </summary>
+        /// <value>
+        /// The reserved length of the string in characters.
+        /// </value>
+        public int ReservedLength => reservedLength;
+
+        /// <summary>
+        /// Gets the reserved length in bytes.
+        /// </summary>
+        /// <value>
+        /// The reserved length in bytes.
+        /// </value>
+        public int ReservedLengthInBytes => type == S7StringType.S7String ? reservedLength + 2 : (reservedLength * 2) + 4;
+    }
+
+
+    /// <summary>
+    /// String type.
+    /// </summary>
+    public enum S7StringType
+    {
+        /// <summary>
+        /// ASCII string.
+        /// </summary>
+        S7String = VarType.S7String,
+
+        /// <summary>
+        /// Unicode string.
+        /// </summary>
+        S7WString = VarType.S7WString
+    }
+}

常用工具集/Utility/Network/S7netplus/Types/S7WString.cs

@@ -0,0 +1,72 @@
+using System;
+using System.Text;
+
+namespace S7.Net.Types
+{
+    /// <summary>
+    /// Contains the methods to convert from S7 wstrings to C# strings
+    /// An S7 WString has a preceding 4 byte header containing its capacity and length
+    /// </summary>
+    public static class S7WString
+    {
+        /// <summary>
+        /// Converts S7 bytes to a string
+        /// </summary>
+        /// <param name="bytes"></param>
+        /// <returns></returns>
+        public static string FromByteArray(byte[] bytes)
+        {
+            if (bytes.Length < 4)
+            {
+                throw new PlcException(ErrorCode.ReadData, "Malformed S7 WString / too short");
+            }
+
+            int size = (bytes[0] << 8) | bytes[1];
+            int length = (bytes[2] << 8) | bytes[3];
+
+            if (length > size)
+            {
+                throw new PlcException(ErrorCode.ReadData, "Malformed S7 WString / length larger than capacity");
+            }
+
+            try
+            {
+                return Encoding.BigEndianUnicode.GetString(bytes, 4, length * 2);
+            }
+            catch (Exception e)
+            {
+                throw new PlcException(ErrorCode.ReadData,
+                    $"Failed to parse {VarType.S7WString} from data. Following fields were read: size: '{size}', actual length: '{length}', total number of bytes (including header): '{bytes.Length}'.",
+                    e);
+            }
+            
+        }
+
+        /// <summary>
+        /// Converts a <see cref="T:string"/> to S7 wstring with 4-byte header.
+        /// </summary>
+        /// <param name="value">The string to convert to byte array.</param>
+        /// <param name="reservedLength">The length (in characters) allocated in PLC for the string.</param>
+        /// <returns>A <see cref="T:byte[]" /> containing the string header and string value with a maximum length of <paramref name="reservedLength"/> + 4.</returns>
+        public static byte[] ToByteArray(string value, int reservedLength)
+        {
+            if (value is null)
+            {
+                throw new ArgumentNullException(nameof(value));
+            }
+
+            if (reservedLength > 16382) throw new ArgumentException("The maximum string length supported is 16382.");
+            
+            var buffer = new byte[4 + reservedLength * 2];
+            buffer[0] = (byte)((reservedLength >> 8) & 0xFF);
+            buffer[1] = (byte)(reservedLength & 0xFF);
+            buffer[2] = (byte)((value.Length >> 8) & 0xFF);
+            buffer[3] = (byte)(value.Length & 0xFF);
+
+            var stringLength = Encoding.BigEndianUnicode.GetBytes(value, 0, value.Length, buffer, 4) / 2;
+            if (stringLength > reservedLength) throw new ArgumentException($"The provided string length ({stringLength} is larger than the specified reserved length ({reservedLength}).");
+
+            return buffer;
+        }
+    }
+}

常用工具集/Utility/Network/S7netplus/Types/Single.cs

@@ -0,0 +1,68 @@
+using System;
+
+namespace S7.Net.Types
+{
+    /// <summary>
+    /// Contains the conversion methods to convert Real from S7 plc to C# float.
+    /// </summary>
+    [Obsolete("Class Single is obsolete. Use Real instead.")]
+    public static class Single
+    {
+        /// <summary>
+        /// Converts a S7 Real (4 bytes) to float
+        /// </summary>
+        public static float FromByteArray(byte[] bytes) => Real.FromByteArray(bytes);
+
+        /// <summary>
+        /// Converts a S7 DInt to float
+        /// </summary>
+        public static float FromDWord(Int32 value)
+        {
+            byte[] b = DInt.ToByteArray(value);
+            float d = FromByteArray(b);
+            return d;
+        }
+
+        /// <summary>
+        /// Converts a S7 DWord to float
+        /// </summary>
+        public static float FromDWord(UInt32 value)
+        {
+            byte[] b = DWord.ToByteArray(value);
+            float d = FromByteArray(b);
+            return d;
+        }
+
+
+        /// <summary>
+        /// Converts a double to S7 Real (4 bytes)
+        /// </summary>
+        public static byte[] ToByteArray(float value) => Real.ToByteArray(value);
+
+        /// <summary>
+        /// Converts an array of float to an array of bytes 
+        /// </summary>
+        public static byte[] ToByteArray(float[] value)
+        {
+            ByteArray arr = new ByteArray();
+            foreach (float val in value)
+                arr.Add(ToByteArray(val));
+            return arr.Array;
+        }
+
+        /// <summary>
+        /// Converts an array of S7 Real to an array of float
+        /// </summary>
+        public static float[] ToArray(byte[] bytes)
+        {
+            float[] values = new float[bytes.Length / 4];
+
+            int counter = 0;
+            for (int cnt = 0; cnt < bytes.Length / 4; cnt++)
+                values[cnt] = FromByteArray(new byte[] { bytes[counter++], bytes[counter++], bytes[counter++], bytes[counter++] });
+
+            return values;
+        }
+        
+    }
+}

常用工具集/Utility/Network/S7netplus/Types/String.cs

@@ -0,0 +1,37 @@
+namespace S7.Net.Types
+{
+    /// <summary>
+    /// Contains the methods to convert from S7 Array of Chars (like a const char[N] C-String) to C# strings
+    /// </summary>
+    public class String
+    {
+        /// <summary>
+        /// Converts a string to <paramref name="reservedLength"/> of bytes, padded with 0-bytes if required.
+        /// </summary>
+        /// <param name="value">The string to write to the PLC.</param>
+        /// <param name="reservedLength">The amount of bytes reserved for the <paramref name="value"/> in the PLC.</param>
+        public static byte[] ToByteArray(string value, int reservedLength)
+        {
+            var length = value?.Length;
+            if (length > reservedLength) length = reservedLength;
+            var bytes = new byte[reservedLength];
+
+            if (length == null || length == 0) return bytes;
+
+            System.Text.Encoding.ASCII.GetBytes(value, 0, length.Value, bytes, 0);
+
+            return bytes;
+        }
+        
+        /// <summary>
+        /// Converts S7 bytes to a string
+        /// </summary>
+        /// <param name="bytes"></param>
+        /// <returns></returns>
+        public static string FromByteArray(byte[] bytes)
+        {
+            return System.Text.Encoding.ASCII.GetString(bytes);
+        }
+
+    }
+}

常用工具集/Utility/Network/S7netplus/Types/StringEx.cs

@@ -0,0 +1,15 @@
+using System;
+
+namespace S7.Net.Types
+{
+    /// <inheritdoc cref="S7String"/>
+    [Obsolete("Please use S7String class")]
+    public static class StringEx
+    {
+        /// <inheritdoc cref="S7String.FromByteArray(byte[])"/>
+        public static string FromByteArray(byte[] bytes) => S7String.FromByteArray(bytes);
+
+        /// <inheritdoc cref="S7String.ToByteArray(string, int)"/>
+        public static byte[] ToByteArray(string value, int reservedLength) => S7String.ToByteArray(value, reservedLength);
+    }
+}

常用工具集/Utility/Network/S7netplus/Types/Struct.cs

@@ -0,0 +1,310 @@
+using System;
+using System.Linq;
+using System.Reflection;
+
+namespace S7.Net.Types
+{
+    /// <summary>
+    /// Contains the method to convert a C# struct to S7 data types
+    /// </summary>
+    public static class Struct
+    {
+        /// <summary>
+        /// Gets the size of the struct in bytes.
+        /// </summary>
+        /// <param name="structType">the type of the struct</param>
+        /// <returns>the number of bytes</returns>
+        public static int GetStructSize(Type structType)
+        {
+            double numBytes = 0.0;
+
+            var infos = structType.GetFields();
+
+            foreach (var info in infos)
+            {
+                switch (info.FieldType.Name)
+                {
+                    case "Boolean":
+                        numBytes += 0.125;
+                        break;
+                    case "Byte":
+                        numBytes = Math.Ceiling(numBytes);
+                        numBytes++;
+                        break;
+                    case "Int16":
+                    case "UInt16":
+                        numBytes = Math.Ceiling(numBytes);
+                        if ((numBytes / 2 - Math.Floor(numBytes / 2.0)) > 0)
+                            numBytes++;
+                        numBytes += 2;
+                        break;
+                    case "Int32":
+                    case "UInt32":
+                        numBytes = Math.Ceiling(numBytes);
+                        if ((numBytes / 2 - Math.Floor(numBytes / 2.0)) > 0)
+                            numBytes++;
+                        numBytes += 4;
+                        break;
+                    case "Single":
+                        numBytes = Math.Ceiling(numBytes);
+                        if ((numBytes / 2 - Math.Floor(numBytes / 2.0)) > 0)
+                            numBytes++;
+                        numBytes += 4;
+                        break;
+                    case "Double":
+                        numBytes = Math.Ceiling(numBytes);
+                        if ((numBytes / 2 - Math.Floor(numBytes / 2.0)) > 0)
+                            numBytes++;
+                        numBytes += 8;
+                        break;
+                    case "String":
+                        S7StringAttribute attribute = info.GetCustomAttributes<S7StringAttribute>().SingleOrDefault();
+                        if (attribute == default(S7StringAttribute))
+                            throw new ArgumentException("Please add S7StringAttribute to the string field");
+
+                        numBytes = Math.Ceiling(numBytes);
+                        if ((numBytes / 2 - Math.Floor(numBytes / 2.0)) > 0)
+                            numBytes++;
+                        numBytes += attribute.ReservedLengthInBytes;
+                        break;
+                    default:
+                        numBytes += GetStructSize(info.FieldType);
+                        break;
+                }
+            }
+            return (int)numBytes;
+        }
+
+        /// <summary>
+        /// Creates a struct of a specified type by an array of bytes.
+        /// </summary>
+        /// <param name="structType">The struct type</param>
+        /// <param name="bytes">The array of bytes</param>
+        /// <returns>The object depending on the struct type or null if fails(array-length != struct-length</returns>
+        public static object FromBytes(Type structType, byte[] bytes)
+        {
+            if (bytes == null)
+                return null;
+
+            if (bytes.Length != GetStructSize(structType))
+                return null;
+
+            // and decode it
+            int bytePos = 0;
+            int bitPos = 0;
+            double numBytes = 0.0;
+            object structValue = Activator.CreateInstance(structType);
+
+
+            var infos = structValue.GetType().GetFields();
+
+            foreach (var info in infos)
+            {
+                switch (info.FieldType.Name)
+                {
+                    case "Boolean":
+                        // get the value
+                        bytePos = (int)Math.Floor(numBytes);
+                        bitPos = (int)((numBytes - (double)bytePos) / 0.125);
+                        if ((bytes[bytePos] & (int)Math.Pow(2, bitPos)) != 0)
+                            info.SetValue(structValue, true);
+                        else
+                            info.SetValue(structValue, false);
+                        numBytes += 0.125;
+                        break;
+                    case "Byte":
+                        numBytes = Math.Ceiling(numBytes);
+                        info.SetValue(structValue, (byte)(bytes[(int)numBytes]));
+                        numBytes++;
+                        break;
+                    case "Int16":
+                        numBytes = Math.Ceiling(numBytes);
+                        if ((numBytes / 2 - Math.Floor(numBytes / 2.0)) > 0)
+                            numBytes++;
+                        // get the value
+                        ushort source = Word.FromBytes(bytes[(int)numBytes + 1], bytes[(int)numBytes]);
+                        info.SetValue(structValue, source.ConvertToShort());
+                        numBytes += 2;
+                        break;
+                    case "UInt16":
+                        numBytes = Math.Ceiling(numBytes);
+                        if ((numBytes / 2 - Math.Floor(numBytes / 2.0)) > 0)
+                            numBytes++;
+                        // get the value
+                        info.SetValue(structValue, Word.FromBytes(bytes[(int)numBytes + 1],
+                                                                          bytes[(int)numBytes]));
+                        numBytes += 2;
+                        break;
+                    case "Int32":
+                        numBytes = Math.Ceiling(numBytes);
+                        if ((numBytes / 2 - Math.Floor(numBytes / 2.0)) > 0)
+                            numBytes++;
+                        // get the value
+                        uint sourceUInt = DWord.FromBytes(bytes[(int)numBytes + 3],
+                                                                           bytes[(int)numBytes + 2],
+                                                                           bytes[(int)numBytes + 1],
+                                                                           bytes[(int)numBytes + 0]);
+                        info.SetValue(structValue, sourceUInt.ConvertToInt());
+                        numBytes += 4;
+                        break;
+                    case "UInt32":
+                        numBytes = Math.Ceiling(numBytes);
+                        if ((numBytes / 2 - Math.Floor(numBytes / 2.0)) > 0)
+                            numBytes++;
+                        // get the value
+                        info.SetValue(structValue, DWord.FromBytes(bytes[(int)numBytes],
+                                                                           bytes[(int)numBytes + 1],
+                                                                           bytes[(int)numBytes + 2],
+                                                                           bytes[(int)numBytes + 3]));
+                        numBytes += 4;
+                        break;
+                    case "Single":
+                        numBytes = Math.Ceiling(numBytes);
+                        if ((numBytes / 2 - Math.Floor(numBytes / 2.0)) > 0)
+                            numBytes++;
+                        // get the value
+                        info.SetValue(structValue, Real.FromByteArray(new byte[] { bytes[(int)numBytes],
+                                                                           bytes[(int)numBytes + 1],
+                                                                           bytes[(int)numBytes + 2],
+                                                                           bytes[(int)numBytes + 3] }));
+                        numBytes += 4;
+                        break;
+                    case "Double":
+                        numBytes = Math.Ceiling(numBytes);
+                        if ((numBytes / 2 - Math.Floor(numBytes / 2.0)) > 0)
+                            numBytes++;
+                        // get the value
+                        var data = new byte[8];
+                        Array.Copy(bytes, (int)numBytes, data, 0, 8);
+                        info.SetValue(structValue, LReal.FromByteArray(data));
+                        numBytes += 8;
+                        break;
+                    case "String":
+                        S7StringAttribute attribute = info.GetCustomAttributes<S7StringAttribute>().SingleOrDefault();
+                        if (attribute == default(S7StringAttribute))
+                            throw new ArgumentException("Please add S7StringAttribute to the string field");
+
+                        numBytes = Math.Ceiling(numBytes);
+                        if ((numBytes / 2 - Math.Floor(numBytes / 2.0)) > 0)
+                            numBytes++;
+
+                        // get the value
+                        var sData = new byte[attribute.ReservedLengthInBytes];
+                        Array.Copy(bytes, (int)numBytes, sData, 0, sData.Length);
+                        switch (attribute.Type)
+                        {
+                            case S7StringType.S7String:
+                                info.SetValue(structValue, S7String.FromByteArray(sData));
+                                break;
+                            case S7StringType.S7WString:
+                                info.SetValue(structValue, S7WString.FromByteArray(sData));
+                                break;
+                            default:
+                                throw new ArgumentException("Please use a valid string type for the S7StringAttribute");
+                        }
+
+                        numBytes += sData.Length;
+                        break;
+                    default:
+                        var buffer = new byte[GetStructSize(info.FieldType)];
+                        if (buffer.Length == 0)
+                            continue;
+                        Buffer.BlockCopy(bytes, (int)Math.Ceiling(numBytes), buffer, 0, buffer.Length);
+                        info.SetValue(structValue, FromBytes(info.FieldType, buffer));
+                        numBytes += buffer.Length;
+                        break;
+                }
+            }
+            return structValue;
+        }
+
+        /// <summary>
+        /// Creates a byte array depending on the struct type.
+        /// </summary>
+        /// <param name="structValue">The struct object</param>
+        /// <returns>A byte array or null if fails.</returns>
+        public static byte[] ToBytes(object structValue)
+        {
+            Type type = structValue.GetType();
+
+            int size = Struct.GetStructSize(type);
+            byte[] bytes = new byte[size];
+            byte[] bytes2 = null;
+
+            int bytePos = 0;
+            int bitPos = 0;
+            double numBytes = 0.0;
+
+            var infos = type.GetFields();
+
+
+            foreach (var info in infos)
+            {
+                bytes2 = null;
+                switch (info.FieldType.Name)
+                {
+                    case "Boolean":
+                        // get the value
+                        bytePos = (int)Math.Floor(numBytes);
+                        bitPos = (int)((numBytes - (double)bytePos) / 0.125);
+                        if ((bool)info.GetValue(structValue))
+                            bytes[bytePos] |= (byte)Math.Pow(2, bitPos);            // is true
+                        else
+                            bytes[bytePos] &= (byte)(~(byte)Math.Pow(2, bitPos));   // is false
+                        numBytes += 0.125;
+                        break;
+                    case "Byte":
+                        numBytes = (int)Math.Ceiling(numBytes);
+                        bytePos = (int)numBytes;
+                        bytes[bytePos] = (byte)info.GetValue(structValue);
+                        numBytes++;
+                        break;
+                    case "Int16":
+                        bytes2 = Int.ToByteArray((Int16)info.GetValue(structValue));
+                        break;
+                    case "UInt16":
+                        bytes2 = Word.ToByteArray((UInt16)info.GetValue(structValue));
+                        break;
+                    case "Int32":
+                        bytes2 = DInt.ToByteArray((Int32)info.GetValue(structValue));
+                        break;
+                    case "UInt32":
+                        bytes2 = DWord.ToByteArray((UInt32)info.GetValue(structValue));
+                        break;
+                    case "Single":
+                        bytes2 = Real.ToByteArray((float)info.GetValue(structValue));
+                        break;
+                    case "Double":
+                        bytes2 = LReal.ToByteArray((double)info.GetValue(structValue));
+                        break;
+                    case "String":
+                        S7StringAttribute attribute = info.GetCustomAttributes<S7StringAttribute>().SingleOrDefault();
+                        if (attribute == default(S7StringAttribute))
+                            throw new ArgumentException("Please add S7StringAttribute to the string field");
+                        switch (attribute.Type)
+                        {
+                            case S7StringType.S7String:
+                                bytes2 = S7String.ToByteArray((string)info.GetValue(structValue), attribute.ReservedLength); break;
+                            case S7StringType.S7WString:
+                                bytes2 = S7WString.ToByteArray((string)info.GetValue(structValue), attribute.ReservedLength); break;
+                            default:
+                                throw new ArgumentException("Please use a valid string type for the S7StringAttribute");
+                        }
+                        break;
+                }
+                if (bytes2 != null)
+                {
+                    // add them
+                    numBytes = Math.Ceiling(numBytes);
+                    if ((numBytes / 2 - Math.Floor(numBytes / 2.0)) > 0)
+                        numBytes++;
+                    bytePos = (int)numBytes;
+                    for (int bCnt = 0; bCnt < bytes2.Length; bCnt++)
+                        bytes[bytePos + bCnt] = bytes2[bCnt];
+                    numBytes += bytes2.Length;
+                }
+            }
+            return bytes;
+        }
+    }
+}

常用工具集/Utility/Network/S7netplus/Types/Timer.cs

@@ -0,0 +1,82 @@
+using System;
+
+namespace S7.Net.Types
+{
+    /// <summary>
+    /// Converts the Timer data type to C# data type
+    /// </summary>
+    public static class Timer
+    {
+        /// <summary>
+        /// Converts the timer bytes to a double
+        /// </summary>
+        public static double FromByteArray(byte[] bytes)
+        {
+            double wert = 0;
+
+            wert = ((bytes[0]) & 0x0F) * 100.0;
+            wert += ((bytes[1] >> 4) & 0x0F) * 10.0;
+            wert += ((bytes[1]) & 0x0F) * 1.0;
+
+            // this value is not used... may for a nother exponation
+            //int unknown = (bytes[0] >> 6) & 0x03;
+
+            switch ((bytes[0] >> 4) & 0x03)
+            {
+                case 0:
+                    wert *= 0.01;
+                    break;
+                case 1:
+                    wert *= 0.1;
+                    break;
+                case 2:
+                    wert *= 1.0;
+                    break;
+                case 3:
+                    wert *= 10.0;
+                    break;
+            }
+
+            return wert;
+        }
+
+        /// <summary>
+        /// Converts a ushort (UInt16) to an array of bytes formatted as time
+        /// </summary>
+        public static byte[] ToByteArray(UInt16 value)
+        {
+            byte[] bytes = new byte[2];
+            bytes[1] = (byte)((int)value & 0xFF);
+            bytes[0] = (byte)((int)value >> 8 & 0xFF);
+
+            return bytes;
+        }
+
+        /// <summary>
+        /// Converts an array of ushorts (Uint16) to an array of bytes formatted as time
+        /// </summary>
+        public static byte[] ToByteArray(UInt16[] value)
+        {
+            ByteArray arr = new ByteArray();
+            foreach (UInt16 val in value)
+                arr.Add(ToByteArray(val));
+            return arr.Array;
+        }
+
+        /// <summary>
+        /// Converts an array of bytes formatted as time to an array of doubles
+        /// </summary>
+        /// <param name="bytes"></param>
+        /// <returns></returns>
+        public static double[] ToArray(byte[] bytes)
+        {
+            double[] values = new double[bytes.Length / 2];
+
+            int counter = 0;
+            for (int cnt = 0; cnt < bytes.Length / 2; cnt++)
+                values[cnt] = FromByteArray(new byte[] { bytes[counter++], bytes[counter++] });
+
+            return values;
+        }
+    }
+}

常用工具集/Utility/Network/S7netplus/Types/TypeHelper.cs

@@ -0,0 +1,43 @@
+using System;
+using System.IO;
+using System.Runtime.InteropServices;
+
+namespace S7.Net.Types
+{
+    internal static class TypeHelper
+    {
+        /// <summary>
+        /// Converts an array of T to an array of bytes 
+        /// </summary>
+        public static byte[] ToByteArray<T>(T[] value, Func<T, byte[]> converter) where T : struct
+        {
+            var buffer = new byte[Marshal.SizeOf(default(T)) * value.Length];
+            var stream = new MemoryStream(buffer);
+            foreach (var val in value)
+            {
+                stream.Write(converter(val), 0, 4);
+            }
+
+            return buffer;
+        }
+
+        /// <summary>
+        /// Converts an array of T repesented as S7 binary data to an array of T
+        /// </summary>
+        public static T[] ToArray<T>(byte[] bytes, Func<byte[], T> converter) where T : struct
+        {
+            var typeSize = Marshal.SizeOf(default(T));
+            var entries = bytes.Length / typeSize;
+            var values = new T[entries];
+
+            for(int i = 0; i < entries; ++i)
+            {
+                var buffer = new byte[typeSize];
+                Array.Copy(bytes, i * typeSize, buffer, 0, typeSize);
+                values[i] = converter(buffer);
+            }
+
+            return values;
+        }
+    }
+}

常用工具集/Utility/Network/S7netplus/Types/Word.cs

@@ -0,0 +1,71 @@
+using System;
+
+namespace S7.Net.Types
+{
+    /// <summary>
+    /// Contains the conversion methods to convert Words from S7 plc to C#.
+    /// </summary>
+    public static class Word
+    {
+        /// <summary>
+        /// Converts a word (2 bytes) to ushort (UInt16)
+        /// </summary>
+        public static UInt16 FromByteArray(byte[] bytes)
+        {
+            if (bytes.Length != 2)
+            {
+                throw new ArgumentException("Wrong number of bytes. Bytes array must contain 2 bytes.");
+            }
+
+            return (UInt16)((bytes[0] << 8) | bytes[1]);
+        }
+
+
+        /// <summary>
+        /// Converts 2 bytes to ushort (UInt16)
+        /// </summary>
+        public static UInt16 FromBytes(byte b1, byte b2)
+        {
+            return (UInt16)((b2 << 8) | b1);
+        }
+
+
+        /// <summary>
+        /// Converts a ushort (UInt16) to word (2 bytes)
+        /// </summary>
+        public static byte[] ToByteArray(UInt16 value)
+        {
+            byte[] bytes = new byte[2];
+
+            bytes[1] = (byte)(value & 0xFF);
+            bytes[0] = (byte)((value>>8) & 0xFF);
+
+            return bytes;
+        }
+
+        /// <summary>
+        /// Converts an array of ushort (UInt16) to an array of bytes
+        /// </summary>
+        public static byte[] ToByteArray(UInt16[] value)
+        {
+            ByteArray arr = new ByteArray();
+            foreach (UInt16 val in value)
+                arr.Add(ToByteArray(val));
+            return arr.Array;
+        }
+
+        /// <summary>
+        /// Converts an array of bytes to an array of ushort
+        /// </summary>
+        public static UInt16[] ToArray(byte[] bytes)
+        {
+            UInt16[] values = new UInt16[bytes.Length/2];
+
+            int counter = 0;
+            for (int cnt = 0; cnt < bytes.Length/2; cnt++)
+                values[cnt] = FromByteArray(new byte[] {bytes[counter++], bytes[counter++]});
+
+            return values;
+        }
+    }
+}