直接上代码：

#include <Windows.h>
#include <iostream>

using namespace std;

int main()
{
    // define the IP address of the PLC
    char* ipAddress = "192.168.1.100";

    // create a socket for communication
    SOCKET s = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
    
    // set up the connection information
    sockaddr_in addr;
    addr.sin_family = AF_INET;
    addr.sin_port = htons(2000);
    inet_pton(AF_INET, ipAddress, &addr.sin_addr);
    
    // connect to the PLC
    int result = connect(s, (sockaddr*)&addr, sizeof(addr));
    if (result == SOCKET_ERROR)
    {
        cout << "Failed to connect to PLC!" << endl;
        return 1;
    }
    
    // send a message to the PLC
    char message[] = "READ D100";
    result = send(s, message, strlen(message), 0);
    if (result == SOCKET_ERROR)
    {
        cout << "Failed to send message to PLC!" << endl;
        return 1;
    }
    
    // receive the response from the PLC
    char response[1024];
    result = recv(s, response, 1024, 0);
    if (result == SOCKET_ERROR)
    {
        cout << "Failed to receive response from PLC!" << endl;
        return 1;
    }
    
    // print the response
    cout << "Response from PLC: " << response << endl;
    
    // close the socket
    closesocket(s);
    
    return 0;

} 

这个程序创建了一个TCP socket连接到PLC，发送了一个“READ D100”的命令，并且接收并显示了PLC返回的响应。然而，这个代码只是示例代码，实际编写与特定PLC通信的程序需要更多的细节和特殊的指令集合。

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