PLC操作简单示例（读写指定寄存器）

最新推荐文章于 2025-08-05 10:11:29 发布

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最新推荐文章于 2025-08-05 10:11:29 发布 · 1w 阅读

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这篇博客展示了如何通过C#编程实现与PLC的TCP/IP连接，进行读写指定寄存器操作。作者提供了一个简单的程序，包括读取、停止、启动和清除操作，通过发送不同命令来改变寄存器状态，并展示接收的响应数据。

最近写的一个程序要和生产线的PLC连动（特定条件下读写指定寄存器），

查询了一些PLC的操作资料，做了一个测试程序：

        private void btnRead_Click(object sender, EventArgs e)
        {
            try
            {

                Socket sock = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
                IPAddress ip = Dns.GetHostEntry(this.txtIP.Text.Trim()).AddressList[0];
                IPEndPoint ipend = new IPEndPoint(ip, int.Parse(this.txtPort.Text.Trim()));
                sock.Connect(ipend);

byte[] cmd;
byte[] rec;

cmd = createCommand("R", int.Parse(this.txtStartAddr.Text), 1);
sock.Send(cmd);

Thread.Sleep(1000);

                rec = new byte[sock.Available];
                sock.Receive(rec);
                this.txtRegInfo.Text = this.txtRegInfo.Text + Environment.NewLine + " <读取> " + b2s(rec);

sock.Shutdown(SocketShutdown.Both);
sock.Close();

            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }

private void btnStop_Click(object sender, EventArgs e)
{

            try
            {
                this.mutexforsocket.WaitOne();
                Socket sock = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
                IPAddress ip = Dns.GetHostEntry(this.txtIP.Text.Trim()).AddressList[0];
                IPEndPoint ipend = new IPEndPoint(ip, int.Parse(this.txtPort.Text.Trim()));
                sock.Connect(ipend);

                byte[] cmd;
                byte[] rec;

                cmd = createCommand("W", int.Parse(this.txtStartAddr.Text), 0x3130);
                sock.Send(cmd);

Thread.Sleep(1000);

                rec = new byte[sock.Available];
                sock.Receive(rec);
                this.txtRegInfo.Text = this.txtRegInfo.Text + Environment.NewLine + " <停止> " + b2s(rec);

                sock.Shutdown(SocketShutdown.Both);
                sock.Close();
                this.mutexforsocket.ReleaseMutex();
            }
            catch (Exception ex)
            {
                MessageBo

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