C# 使用modbus 读取PLC 寄存器地址的方法

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);

            }

        }