C# 三菱PLC通讯
时间: 2024-01-30 13:11:40 浏览: 34
C#与三菱PLC通讯可以使用MC协议来实现。MC协议是一种常用的通信协议,用于实现三菱PLC与其他设备之间的通信。通过编写相应的通信程序,可以实现读写PLC的数据,监控PLC的状态等功能。
以下是一个使用C#与三菱PLC通讯的示例代码:
```csharp
using System;
using System.Net.Sockets;
public class MitsubishiPLCCommunication
{
private TcpClient client;
private NetworkStream stream;
public void Connect(string ipAddress, int port)
{
client = new TcpClient();
client.Connect(ipAddress, port);
stream = client.GetStream();
}
public void Disconnect()
{
stream.Close();
client.Close();
}
public byte[] ReadData(int deviceCode, int startAddress, int length)
{
byte[] command = new byte[8];
command[0] = 0x50; // Header
command[1] = 0x00; // Network number
command[2] = 0xFF; // PC number
command[3] = 0xFF; // I/O number
command[4] = 0x03; // Request destination module
command[5] = 0x00; // Request destination module
command[6] = 0x0C; // Command
command[7] = 0x00; // Subcommand
byte[] data = new byte[12];
data[0] = (byte)(deviceCode & 0xFF); // Device code
data[1] = (byte)((deviceCode >> 8) & 0xFF); // Device code
data[2] = (byte)(startAddress & 0xFF); // Start address
data[3] = (byte)((startAddress >> 8) & 0xFF); // Start address
data[4] = (byte)((startAddress >> 16) & 0xFF); // Start address
data[5] = (byte)((startAddress >> 24) & 0xFF); // Start address
data[6] = (byte)(length & 0xFF); // Length
data[7] = (byte)((length >> 8) & 0xFF); // Length
data[8] = 0x00; // CPU monitoring timer
data[9] = 0x00; // CPU monitoring timer
data[10] = 0x00; // CPU monitoring timer
data[11] = 0x00; // CPU monitoring timer
byte[] request = new byte[command.Length + data.Length];
Array.Copy(command, 0, request, 0, command.Length);
Array.Copy(data, 0, request, command.Length, data.Length);
stream.Write(request, 0, request.Length);
byte[] response = new byte[1024];
int bytesRead = stream.Read(response, 0, response.Length);
byte[] result = new byte[bytesRead - 9];
Array.Copy(response, 9, result, 0, bytesRead - 9);
return result;
}
}
public class Program
{
public static void Main()
{
MitsubishiPLCCommunication communication = new MitsubishiPLCCommunication();
communication.Connect("192.168.0.1", 5000);
byte[] data = communication.ReadData(0x01, 0x0000, 10);
foreach (byte value in data)
{
Console.WriteLine(value);
}
communication.Disconnect();
}
}
```
上述代码中,我们首先创建了一个`MitsubishiPLCCommunication`类,其中包含了连接PLC、断开连接、读取数据的方法。在`Main`方法中,我们创建了一个`MitsubishiPLCCommunication`对象,并调用`Connect`方法连接到PLC,然后调用`ReadData`方法读取PLC的数据,并打印出来,最后调用`Disconnect`方法断开连接。
请注意,上述代码中的IP地址和端口号需要根据实际情况进行修改。