S7 1200开放式通信 PLC做服务器端

原创已于 2022-01-27 02:04:32 修改 · 546 阅读

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#c# #linq #网络

于 2022-01-27 00:59:49 首次发布

本文详细介绍了如何使用S7 1200系列PLC作为服务器端进行开放式通信。内容涵盖设置步骤、编程技巧以及可能遇到的问题解决方法，旨在帮助读者理解并实现PLC与外部设备间的高效数据交互。

S7 1200开放式通信 PLC做服务器端


using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;


namespace TCPDemo
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private Socket tcpClient;

        private CancellationTokenSource cts;

        private byte[] setArray;

        //Socket  API  位于传输层和应用层

        private void btn_Connect_Click(object sender, EventArgs e)
        {
            tcpClient = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);

            try
            {
                tcpClient.Connect(IPAddress.Parse(this.txt_IP.Text), int.Parse(this.txt_Port.Text));
            }
            catch (Exception ex)
            {
                MessageBox.Show("连接失败：" + ex.Message);
                return;
            }

            cts = new CancellationTokenSource();

            Task.Run(new Action(() =>
            {
                ReceiveFromPLC();
            }), cts.Token);


            MessageBox.Show("连接成功");
        }

        private void ReceiveFromPLC()
        {
            while (!cts.IsCancellationRequested)
            {
                byte[] buffer = new byte[1024];

                int length = -1;

                try
                {
                    length = tcpClient.Receive(buffer, SocketFlags.None);
                }
                catch (Exception)
                {
                    //写入日志
                    break;
                }

                //数据解析  

                // 压力  DB100.DBD0
                //状态  DB100.DBX4.0
                //温度  DB100.DBW6
                //start   offset   数据类型 

                if (length == 100)
                {

                    byte[] result = ByteArrayLib.GetByteArray(buffer, 0, 50);

                    setArray = ByteArrayLib.GetByteArray(buffer, 50, 50);

                    Invoke(new Action(() =>
                    {

                        foreach (Control item in this.Controls)
                        {
                            if (item is LabelShow ls)
                            {
                                //最好加一个判断  保证属性设置都是正确的
                                switch (ls.DataType)
                                {
                                    case DataType.Bit:
                                        ls.VarValue = BitLib.GetBitFromByteArray(result, ls.Start, ls.Offset).ToString();
                                        break;
                                    case DataType.Short:
                                        ls.VarValue = ShortLib.GetShortFromByteArray(result, ls.Start).ToString();
                                        break;
                                    case DataType.UShort:
                                        ls.VarValue = UShortLib.GetUShortFromByteArray(result, ls.Start).ToString();
                                        break;
                                    case DataType.Int:
                                        ls.VarValue = IntLib.GetIntFromByteArray(result, ls.Start).ToString();
                                        break;
                                    case DataType.UInt:
                                        ls.VarValue = UIntLib.GetUIntFromByteArray(result, ls.Start).ToString();
                                        break;
                                    case DataType.Float:
                                        ls.VarValue = FloatLib.GetFloatFromByteArray(result, ls.Start).ToString();
                                        break;
                                    case DataType.Double:
                                        ls.VarValue = DoubleLib.GetDoubleFromByteArray(result, ls.Start).ToString();
                                        break;
                                    default:
                                        break;
                                }
                            }
                        }
                    }));
                }
            }
        }

        private void btn_Write_Click(object sender, EventArgs e)
        {
            float value = Convert.ToSingle(this.textBox1.Text);

            byte[] res = ByteArrayLib.GetByteArrayFromFloat(value);

            byte[] set = ByteArrayLib.ReplaceByteArray(setArray, 0, res);

            tcpClient.Send(set, SocketFlags.None);
        }
    }
}