C#实现三菱FX-3U SerialOverTcp

设备信息

测试结果

D值测试

Y值写入后读取测试

协议解析

三菱FX 3U系列PLC的通信协议

1. 每次给PLC发送指令后，必须等待PLC的应答完成才能发送下一条指令;
2. 报文都是十六进制ASCII码的形式
3. 相关指令

指令命令码（ASCII码）操作原件
读 0（30H） X,Y,M,S,T,C,D
写 1（31H） X,Y,M,S,T,C,D
置位 7（37H） X,Y,M,S,T,C
复位 8（38H） X,Y,M,S,T,C

地址换算：D123这个地址写入数据，那么地址为： address = 123*2 + 4096 = 4342 = 10F6
==================================================================================
读指令

上位机请求：STX(1) + CMD(1) + Address(4) + Length(2) + ETX(1) + SUM(2,从cmd到etx)

PLC响应：STX(1) + 值(n字节) + ETX(1) + SUM(2)

**********************************************************************************
例子：
X,Y,D通过相应的地址换算成新的地址

读取Y005 / Y006 bool

02 30 30 30 41 30 30 31 03 36 35 ：范围（0-7 地址）地址： A0 160
02 30 30 30 41 31 30 31 03 36 36 ：范围（10-17 地址）地址： A1 161
02 30 30 30 41 32 30 31 03 36 37 ：范围（20-27 地址）地址： A2 162

02 30 30 30 41 30 30 31 03 36 35

02 32 30 03 36 35：5亮 32 30 -> 20H -> 转二进制 0010 0000

02 36 30 03 36 39：5，6亮 36 30 -> 60H -> 转二进制 0110 0000

D123读取2个字节，short类型
新版：指令45
老版：
02 30 31 30 46 36 30 32 03 37 32
02 30 30 30 30 03 43 33 -- 值为0
02 30 31 30 30 03 43 34 -- 值为1

==================================================================================
写指令

上位机请求：STX(1) + CMD(1) + Address(4) + Length(2) + Data（4*n）+ ETX(1) + SUM(2,从cmd到etx)

PLC响应：STX(1) + 值(1字节正确：06H；错误：15H) + ETX(1) + SUM(2)

例子：

Y006设置true
02 37 30 36 30 35 03 30 35
06

D123写入2个字节，short类型，值1

新版
0245313034304636303230313030034143
06

老版：写入值：1
02 31 31 30 46 36 30 34 30 31 30 30 30 30 30 30 03 46 36
06

================================================

核心代码

using MelsecFxOverTcp;
using System;
using System.Net.Sockets;
using System.Text;namespace MelsecFxSerialOverTcp.Util
{class MelsecFx{string ip = string.Empty;int port = 0;int SendTimeout = 2000;int ReceiveTimeout = 2000;public MelsecFx(string ip, int port){this.ip = ip;this.port = port;}static string NotSupportedDataType => "输入的类型不支持，请重新输入";/// <summary>/// 地址解析/// </summary>static void FxAnalysisAddress(string address, ref MelsecMcDataType Content1, ref ushort Content2){switch (address[0]){case 'M':case 'm':Content1 = MelsecMcDataType.M;Content2 = Convert.ToUInt16(address.Substring(1), MelsecMcDataType.M.FromBase);break;case 'X':case 'x':Content1 = MelsecMcDataType.X;Content2 = Convert.ToUInt16(address.Substring(1), 8);break;case 'Y':case 'y':Content1 = MelsecMcDataType.Y;Content2 = Convert.ToUInt16(address.Substring(1), 8);break;case 'D':case 'd':Content1 = MelsecMcDataType.D;Content2 = Convert.ToUInt16(address.Substring(1), MelsecMcDataType.D.FromBase);break;case 'S':case 's':Content1 = MelsecMcDataType.S;Content2 = Convert.ToUInt16(address.Substring(1), MelsecMcDataType.S.FromBase);break;case 'T':case 't':if (address[1] == 'N' || address[1] == 'n'){Content1 = MelsecMcDataType.TN;Content2 = Convert.ToUInt16(address.Substring(2), MelsecMcDataType.TN.FromBase);break;}if (address[1] == 'S' || address[1] == 's'){Content1 = MelsecMcDataType.TS;Content2 = Convert.ToUInt16(address.Substring(2), MelsecMcDataType.TS.FromBase);break;}if (address[1] == 'C' || address[1] == 'c'){Content1 = MelsecMcDataType.TC;Content2 = Convert.ToUInt16(address.Substring(2), MelsecMcDataType.TC.FromBase);break;}throw new Exception(NotSupportedDataType);case 'C':case 'c':if (address[1] == 'N' || address[1] == 'n'){Content1 = MelsecMcDataType.CN;Content2 = Convert.ToUInt16(address.Substring(2), MelsecMcDataType.CN.FromBase);break;}if (address[1] == 'S' || address[1] == 's'){Content1 = MelsecMcDataType.CS;Content2 = Convert.ToUInt16(address.Substring(2), MelsecMcDataType.CS.FromBase);break;}if (address[1] == 'C' || address[1] == 'c'){Content1 = MelsecMcDataType.CC;Content2 = Convert.ToUInt16(address.Substring(2), MelsecMcDataType.CC.FromBase);break;}throw new Exception(NotSupportedDataType);default:throw new Exception(NotSupportedDataType);}}public bool ConnectServer(){bool ret = false;TcpClient client = null;try{using (client = new TcpClient(ip, port)){ret = client.Connected;client.Close();}}catch (Exception ex){}finally{if (null != client) client.Close();}return ret;}/// <summary>/// // 串口或者网口发送数据/// </summary>/// <exception cref="Exception"></exception>byte[] SendWaitResponse(byte[] data){var requestStr = DataHelper.ToHexString(data, data.Length, true);DataMgr.MainUI.AddMessage("C -> S: " + requestStr);byte[] ret = null;using (var client = new TcpClient(ip, port)){client.SendTimeout = SendTimeout;client.ReceiveTimeout = ReceiveTimeout;var netstream = client.GetStream();//netstream.Write(data, 0, data.Length);//byte[] temp = new byte[2048];int recvnum = netstream.Read(temp, 0, temp.Length);if (recvnum == 0){throw new Exception("数据接收超时");}ret = new byte[recvnum];Array.Copy(temp, 0, ret, 0, recvnum);}var responseStr = DataHelper.ToHexString(ret, ret.Length, true);DataMgr.MainUI.AddMessage("S -> C: " + responseStr);return ret;}public bool[] ReadBool(string address, int length){Console.WriteLine($"ReadBool,address={address},length={length}");MelsecMcDataType Content1 = MelsecMcDataType.M;ushort Content2 = 0;FxAnalysisAddress(address, ref Content1, ref Content2);// 地址转换ushort content = Content2;if (Content1 == MelsecMcDataType.M){content = ((content < 8000) ? ((ushort)((int)content / 8 + 256)) : ((ushort)((content - 8000) / 8 + 480)));}else if (Content1 == MelsecMcDataType.X){content = (ushort)((int)content / 8 + 128);}else if (Content1 == MelsecMcDataType.Y){content = (ushort)((int)content / 8 + 160);}else if (Content1 == MelsecMcDataType.S){content = (ushort)((int)content / 8);}else if (Content1 == MelsecMcDataType.CS){content = (ushort)((int)content / 8 + 448);}else if (Content1 == MelsecMcDataType.CC){content = (ushort)((int)content / 8 + 960);}else if (Content1 == MelsecMcDataType.TS){content = (ushort)((int)content / 8 + 192);}else{if (Content1 != MelsecMcDataType.TC){ throw new Exception("当前的类型不支持位读写");}content = (ushort)((int)content / 8 + 704);}var Content3 = (ushort)((int)Content2 % 8);ushort num = (ushort)((Content2 + length - 1) / 8 - (int)Content2 / 8 + 1);byte[] array = new byte[11]{2,48,SoftBasic.BuildAsciiBytesFrom(content)[0],SoftBasic.BuildAsciiBytesFrom(content)[1],SoftBasic.BuildAsciiBytesFrom(content)[2],SoftBasic.BuildAsciiBytesFrom(content)[3],SoftBasic.BuildAsciiBytesFrom((byte)num)[0],SoftBasic.BuildAsciiBytesFrom((byte)num)[1],3,0,0};DataHelper.FxCalculateSum(array).CopyTo(array, 9); byte[] response = SendWaitResponse(array);// **********************// Y005 or Y006 读取测试//string responseStr = "02 36 30 03 36 39";// 5亮：02 32 30 03 36 35 // 5和6亮：02 36 30 03 36 39//var response = DataHelper.ToHexByte(responseStr); var results = ExtractActualBoolData(response, Content3, length); return results;}public byte[] ReadWord(string address, ushort length, bool isNewVersion = false){Console.WriteLine($"ReadWord,address={address},length={length}");MelsecMcDataType Content1 = MelsecMcDataType.M;ushort Content2 = 0;FxAnalysisAddress(address, ref Content1, ref Content2);ushort content = Content2;if (Content1 == MelsecMcDataType.D){content = ((content < 8000) ? (isNewVersion ? ((ushort)(content * 2 + 16384)) : ((ushort)(content * 2 + 4096))) : ((ushort)((content - 8000) * 2 + 3584)));}else if (Content1 == MelsecMcDataType.CN){content = ((content < 200) ? ((ushort)(content * 2 + 2560)) : ((ushort)((content - 200) * 4 + 3072)));}else{if (Content1 != MelsecMcDataType.TN){ throw new Exception("当前的类型不支持字读写");}content = (ushort)(content * 2 + 2048);}length = (ushort)(length * 2);byte[] array;if (isNewVersion){array = new byte[13]{2,69,48,48,SoftBasic.BuildAsciiBytesFrom(content)[0],SoftBasic.BuildAsciiBytesFrom(content)[1],SoftBasic.BuildAsciiBytesFrom(content)[2],SoftBasic.BuildAsciiBytesFrom(content)[3],SoftBasic.BuildAsciiBytesFrom((byte)length)[0],SoftBasic.BuildAsciiBytesFrom((byte)length)[1],3,0,0};DataHelper.FxCalculateSum(array).CopyTo(array, 11);}else{array = new byte[11]{2,48,SoftBasic.BuildAsciiBytesFrom(content)[0],SoftBasic.BuildAsciiBytesFrom(content)[1],SoftBasic.BuildAsciiBytesFrom(content)[2],SoftBasic.BuildAsciiBytesFrom(content)[3],SoftBasic.BuildAsciiBytesFrom((byte)length)[0],SoftBasic.BuildAsciiBytesFrom((byte)length)[1],3,0,0};DataHelper.FxCalculateSum(array).CopyTo(array, 9);}//var request = DataHelper.ToHexString(array, array.Length, true);//DataMgr.MainUI.AddMessage("request:" + request);// 串口或者网口发送数据// .....// // **********************// D123 读取测试//string responseStr = "02 30 31 30 30 03 43 34";// 值为0：02 30 30 30 30 03 43 33 // 值为1：02 30 31 30 30 03 43 34//var response = DataHelper.ToHexByte(responseStr);//DataMgr.MainUI.AddMessage(responseStr);var response = SendWaitResponse(array);var results = ExtractActualData(response);return results;}public void WriteBool(string address, bool value){Console.WriteLine($"WriteBool,address={address},value={value}");MelsecMcDataType Content1 = MelsecMcDataType.M;ushort Content2 = 0;FxAnalysisAddress(address, ref Content1, ref Content2);  ushort content = Content2;if (Content1 == MelsecMcDataType.M){content = ((content < 8000) ? ((ushort)(content + 2048)) : ((ushort)(content - 8000 + 3840)));}else if (Content1 == MelsecMcDataType.S){content = content;}else if (Content1 == MelsecMcDataType.X){content = (ushort)(content + 1024);}else if (Content1 == MelsecMcDataType.Y){content = (ushort)(content + 1280);}else if (Content1 == MelsecMcDataType.CS){content = (ushort)(content + 448);}else if (Content1 == MelsecMcDataType.CC){content = (ushort)(content + 960);}else if (Content1 == MelsecMcDataType.CN){content = (ushort)(content + 3584);}else if (Content1 == MelsecMcDataType.TS){content = (ushort)(content + 192);}else if (Content1 == MelsecMcDataType.TC){content = (ushort)(content + 704);}else{if (Content1 != MelsecMcDataType.TN){// "当前的类型不支持位读写"return ;}content = (ushort)(content + 1536);}byte[] array = new byte[9]{2,(byte)(value ? 55 : 56),SoftBasic.BuildAsciiBytesFrom(content)[2],SoftBasic.BuildAsciiBytesFrom(content)[3],SoftBasic.BuildAsciiBytesFrom(content)[0],SoftBasic.BuildAsciiBytesFrom(content)[1],3,0,0};DataHelper.FxCalculateSum(array).CopyTo(array, 7);SendWaitResponse(array);}//public static void Write(string address, int value)//{//    Write(address, new int[1] { value });//}//public static void Write(string address, int[] values)//{//    Write(address, ByteTransformBase.TransByte(values));//}public void WriteWord(string address, byte[] value, bool isNewVersion = false){Console.WriteLine($"WriteBytes,address={address},value={value}");MelsecMcDataType Content1 = MelsecMcDataType.M;ushort Content2 = 0;FxAnalysisAddress(address, ref Content1, ref Content2);ushort content = Content2;if (Content1 == MelsecMcDataType.D){content = ((content < 8000) ? (isNewVersion ? ((ushort)(content * 2 + 16384)) : ((ushort)(content * 2 + 4096))) : ((ushort)((content - 8000) * 2 + 3584)));}else if (Content1 == MelsecMcDataType.CN){content = ((content < 200) ? ((ushort)(content * 2 + 2560)) : ((ushort)((content - 200) * 4 + 3072)));}else{if (Content1 != MelsecMcDataType.TN){return;// 当前的类型不支持字读写}content = (ushort)(content * 2 + 2048);}if (value != null){value = SoftBasic.BuildAsciiBytesFrom(value);}byte[] array = null;if (isNewVersion){array = new byte[13 + value.Length];array[0] = 2;array[1] = 69;array[2] = 49;array[3] = 48;array[4] = SoftBasic.BuildAsciiBytesFrom(content)[0];array[5] = SoftBasic.BuildAsciiBytesFrom(content)[1];array[6] = SoftBasic.BuildAsciiBytesFrom(content)[2];array[7] = SoftBasic.BuildAsciiBytesFrom(content)[3];array[8] = SoftBasic.BuildAsciiBytesFrom((byte)(value.Length / 2))[0];array[9] = SoftBasic.BuildAsciiBytesFrom((byte)(value.Length / 2))[1];Array.Copy(value, 0, array, 10, value.Length);array[array.Length - 3] = 3; }else{array = new byte[11 + value.Length];array[0] = 2;array[1] = 49;array[2] = SoftBasic.BuildAsciiBytesFrom(content)[0];array[3] = SoftBasic.BuildAsciiBytesFrom(content)[1];array[4] = SoftBasic.BuildAsciiBytesFrom(content)[2];array[5] = SoftBasic.BuildAsciiBytesFrom(content)[3];array[6] = SoftBasic.BuildAsciiBytesFrom((byte)(value.Length / 2))[0];array[7] = SoftBasic.BuildAsciiBytesFrom((byte)(value.Length / 2))[1];Array.Copy(value, 0, array, 8, value.Length);array[array.Length - 3] = 3;}DataHelper.FxCalculateSum(array).CopyTo(array, array.Length - 2);SendWaitResponse(array); }public static string CheckPlcReadResponse(byte[] ack){if (ack.Length == 0){return "接收的数据长度为0";}if (ack[0] == 21){return "PLC反馈的数据无效,Actual: " + SoftBasic.ByteToHexString(ack, ' ');}if (ack[0] != 2){return "PLC反馈信号错误：" + ack[0] + " Actual: " + SoftBasic.ByteToHexString(ack, ' ');}if (!DataHelper.CheckSum(ack)){return "PLC反馈报文的和校验失败！";}return string.Empty;}public static byte[] ExtractActualData(byte[] response){byte[] array = new byte[(response.Length - 4) / 2];for (int i = 0; i < array.Length; i++){byte[] bytes = new byte[2]{response[i * 2 + 1],response[i * 2 + 2]};array[i] = Convert.ToByte(Encoding.ASCII.GetString(bytes), 16);}return array;}public static bool[] ExtractActualBoolData(byte[] response, int start, int length){// 02 32 30 03 36 35 Data:20H -> 十进制32 -> 0010 0000// 02 36 30 03 36 39 Data:60H -> 十进制96 -> 0110 0000byte[] Content = ExtractActualData(response);bool[] arraybool = new bool[length];bool[] array2 = SoftBasic.ByteToBoolArray(Content, Content.Length * 8);// false false false false true false falsefor (int i = 0; i < length; i++){arraybool[i] = array2[i + start];}return arraybool;}}
}