使用的组件Nmodbus
定义参数，全局变量：
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//创建modbus实体对象 private static ModbusFactory modbusFactory; private static IModbusMaster master; //写线圈或写寄存器数组 bool[] coilsBuffer; ushort[] registerBuffer; //功能码 string functionCode; //参数(分别为站号,起始地址,长度) byte slaveAddress; ushort startAddress; ushort numberOfPoints; //ip 地址与端口号 string IPAddress = string.Empty; int VisitPort = 502; |
初始化参数，创建连接：
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private void Connection(object sender, EventArgs e) { try { //PLC连接配置信息，PLC ip地址 IPAddress =127.0.0.1; //端口，modbus 默认502，根据实际情况填写 VisitPort =502; //初始化modbusmaster modbusFactory = new ModbusFactory(); //在本地测试 所以使用回环地址,modbus协议规定端口号 502 master = modbusFactory.CreateMaster(new TcpClient(IPAddress, VisitPort)); //设置读取超时时间 master.Transport.ReadTimeout = 10000; master.Transport.Retries = 2000; } catch (Exception ex) { MessageBox.Show(ex.Message); } } |
初始化读写参数
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/// <summary> /// 初始化读参数 /// </summary> private void SetReadParameters(int slaveAddress=1,int startAddress=200,int numberOfPoints=1) { //DeviceID slaveAddress = byte.Parse(slaveAddress); //起始地址， startAddress = ushort.Parse(startAddress); //数据长度 numberOfPoints = ushort.Parse(numberOfPoints); } |
运行读取方法
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private async void ExecuteFunction() { try { //Moddbus共有这些功能码 //01 Read Coils //02 Read DisCrete Inputs //03 Read Holding Registers //04 Read Input Registers //05 Write Single Coil //06 Write Single Registers //0F Write Multiple Coils //10 Write Multiple Registers functionCode="01 Read Coils"；//根据实际点号类型选择读写功能码 //重新实例化是为了 modbus slave更换连接时不报错 //master = modbusFactory.CreateMaster(new TcpClient(IPAddress, VisitPort)); if (functionCode != null) { switch (functionCode) { case "01 Read Coils"://读取单个线圈 SetReadParameters(); coilsBuffer = master.ReadCoils(slaveAddress, startAddress, numberOfPoints); for (int i = 0; i < coilsBuffer.Length; i++) { SetMsg(coilsBuffer[i] + " "); } SetMsg("\r\n"); break; case "02 Read DisCrete Inputs"://读取输入线圈/离散量线圈 SetReadParameters(); coilsBuffer = master.ReadInputs(slaveAddress, startAddress, numberOfPoints); for (int i = 0; i < coilsBuffer.Length; i++) { SetMsg(coilsBuffer[i] + " "); } SetMsg("\r\n"); break; case "03 Read Holding Registers"://读取保持寄存器 SetReadParameters(); registerBuffer = master.ReadHoldingRegisters(slaveAddress, startAddress, numberOfPoints); for (int i = 0; i < registerBuffer.Length; i++) { SetMsg(registerBuffer[i] + " "); } SetMsg("\r\n"); break; case "04 Read Input Registers"://读取输入寄存器 SetReadParameters(); registerBuffer = master.ReadInputRegisters(slaveAddress, startAddress, numberOfPoints); for (int i = 0; i < registerBuffer.Length; i++) { SetMsg(registerBuffer[i] + " "); } SetMsg("\r\n"); break; case "05 Write Single Coil"://写单个线圈 SetWriteParametes(); await master.WriteSingleCoilAsync(slaveAddress, startAddress, coilsBuffer[0]); break; case "06 Write Single Registers"://写单个输入线圈/离散量线圈 SetWriteParametes(); await master.WriteSingleRegisterAsync(slaveAddress, startAddress, registerBuffer[0]); break; case "0F Write Multiple Coils"://写一组线圈 SetWriteParametes(); await master.WriteMultipleCoilsAsync(slaveAddress, startAddress, coilsBuffer); break; case "10 Write Multiple Registers"://写一组保持寄存器 SetWriteParametes(); await master.WriteMultipleRegistersAsync(slaveAddress, startAddress, registerBuffer); break; default: break; } } else { MessageBox.Show("请选择功能码!"); } master.Dispose(); } catch (Exception ex) { MessageBox.Show(ex.Message); } } |
//展示消息
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/// <summary> /// SetMessage /// </summary> /// <param name="msg"></param> public void SetMsg(string msg) { MessageBox.Show(msg); } |
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原文链接：https://www.cnblogs.com/motion/p/15407189.html
