【下位机学习】ModbusTcp简单学习

💡 最近负责泰国工厂生产系统的前期搭建和现场对接，在跟厂家下位机对接时，遇到了比较常用的ModbusTcp协议，特此记录一下。

 

作者	小庞
状态	编辑中
简介	Modbus TCP/IP协议的简单介绍和常用对接情况处理

1、简介

https://www.cnblogs.com/The-explosion/p/11512677.html

可以参照这篇博客。

 

2、模拟工具

1、Modbus Slave 从站工具

2、ModbusPoll 主站工具

3、HslCommunicationDemo 主站工具

 

 

3、开源包

1、EasyModbusTCP.NET

GitHub - rossmann-engineering/EasyModbusTCP.NET: Modbus TCP, Modbus UDP and Modbus RTU client/server library for .NET implementations

2、NModbus

https://github.com/NModbus/NModbus

4、简单代码示例

1、EasyModbusTCP.NET

namespace ModbusClientApplication
{
    class Program
    {
        public static void Main(string[] args)
        {
            ModbusClient modbusClient = new ModbusClient("190.201.100.100", 502);    //Ip-Address and Port of Modbus-TCP-Server
            modbusClient.Connect();                                                    //Connect to Server
            modbusClient.WriteMultipleCoils(4, new bool[] {true, true, true, true, true, true, true, true, true, true});    //Write Coils starting with Address 5
            bool[] readCoils = modbusClient.ReadCoils(9,10);                        //Read 10 Coils from Server, starting with address 10
            int[] readHoldingRegisters = modbusClient.ReadHoldingRegisters(0,10);    //Read 10 Holding Registers from Server, starting with Address 1

            // Console Output
            for (int i = 0; i < readCoils.Length; i++)
                Console.WriteLine("Value of Coil " + (9 + i + 1) + " " + readCoils[i].ToString());
                        
            for (int i = 0; i < readHoldingRegisters.Length; i++)
                Console.WriteLine("Value of HoldingRegister " + (i + 1) + " "+ readHoldingRegisters[i].ToString());            
            modbusClient.Disconnect();                                                //Disconnect from Server
            Console.Write("Press any key to continue . . . ");
            Console.ReadKey(true);
        }
    }
}

　　

2、NModbus

       /// <summary>
        ///     Modbus TCP master and slave example.
        /// </summary>
        public static void ModbusTcpMasterReadInputsFromModbusSlave()
        {
            byte slaveId = 1;
            int port = 502;
            IPAddress address = new IPAddress(new byte[] { 127, 0, 0, 1 });

            // create and start the TCP slave
            TcpListener slaveTcpListener = new TcpListener(address, port);
            slaveTcpListener.Start();

            var factory = new ModbusFactory();
            var network = factory.CreateSlaveNetwork(slaveTcpListener);

            IModbusSlave slave = factory.CreateSlave(slaveId);

            network.AddSlave(slave);

            var listenTask = network.ListenAsync();

            // create the master
            TcpClient masterTcpClient = new TcpClient(address.ToString(), port);
            IModbusMaster master = factory.CreateMaster(masterTcpClient);

            ushort numInputs = 5;
            ushort startAddress = 100;

            // read five register values
            ushort[] inputs = master.ReadInputRegisters(0, startAddress, numInputs);

            for (int i = 0; i < numInputs; i++)
            {
                Console.WriteLine($"Register {(startAddress + i)}={(inputs[i])}");
            }

            // clean up
            masterTcpClient.Close();
            slaveTcpListener.Stop();

            // output
            // Register 100=0
            // Register 101=0
            // Register 102=0
            // Register 103=0
            // Register 104=0
        }