C# Socket 完整代码

以下是一个简单的C# Socket通讯的示例代码：

using System;
using System.Net;
using System.Net.Sockets;
using System.Text;

class Program
{
    static void Main()
    {
        // 设定PLC的IP地址和端口号
        string ipAddress = "192.168.0.1";
        int port = 102;

        try
        {
            // 创建一个Socket对象
            Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);

            // 连接到PLC
            socket.Connect(IPAddress.Parse(ipAddress), port);
            Console.WriteLine("Connected to PLC ...");

            // 发送数据到PLC
            string message = "Hello PLC!";
            byte[] sendData = Encoding.ASCII.GetBytes(message);
            socket.Send(sendData);

            // 接收PLC的响应
            byte[] buffer = new byte[1024];
            int receivedBytes = socket.Receive(buffer);
            string receivedData = Encoding.ASCII.GetString(buffer, 0, receivedBytes);
            Console.WriteLine("Received data: " + receivedData);

            // 关闭Socket连接
            socket.Shutdown(SocketShutdown.Both);
            socket.Close();
        }
        catch (Exception ex)
        {
            Console.WriteLine("Error: " + ex.Message);
        }

        Console.ReadLine();
    }
}

这段代码通过创建一个Socket对象，使用指定的IP地址和端口号连接到PLC。然后，发送一条消息到PLC，并等待PLC的响应。最后，关闭Socket连接。需要根据实际情况修改IP地址和端口号，并根据PLC的通讯协议进行数据的发送和接收。