
c++编写一个与松下PLC通讯的示例程序
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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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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