西门子PLC与电脑走S7通讯

本文已参与「新人创作礼」活动，一起开启掘金创作之路。

What is S7.Net 什么是 S7.Net S7.Net is a plc driver that works only with Siemens PLC and only with Ethernet connection. This means that your plc must have a Profinet CPU or a profinet external card (CPxxx card). S7.Net is written entirely in C#, so you can debug it easily without having to go through native dlls. S7.Net 是一个 plc 驱动程序，仅适用于 Siemens PLC 和以太网连接。 这意味着 您的 PLC 必须具有 Profinet CPU 或 Profinet 外部卡(CPxxx 卡)。 S7.Net 完全用 C＃编写，因此您无需通过本机 dll 即可轻松调试它。 支持的 PLC S7.Net is compatible with S7-200, S7-300, S7-400, S7-1200, S7-1500. S7.Net 与 S7-200，S7-300，S7-400，S7-1200 和 S7-1500 兼容。 本文是基于S7的说明文档做的开发，但是暴怒知道怎么引用本地文档，所以就只能把代码全部放上来了。文档的话我上传到阿里云盘了，我把分享的资料都上传了 「S7.NET中文说明书.pdf」https://www.aliyundrive.com/s/sZLtGN9E75g 点击链接保存，或者复制本段内容，打开「阿里云盘」APP ，无需下载极速在线查看，视频原画倍速播放。 ```js

using S7.Net; using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Reflection; using System.Text; using System.Threading.Tasks; using System.Windows.Forms;

namespace PLCS7netTEST { public partial class PlcForm : Form {

#region 变量

    //实例
    private Plc myplc;


    private CpuType cpuType = new CpuType();

    //枚举
    private enum DQFS
    {
        Read = 0,
        ReadBytes,
        ReadClass,
        ReadStruct
    }

    //枚举
    private enum XRFS
    {
        Write = 0,
        WriteBytes,
        WriteClass,
        WriteStruct
    }

    private string OutValue = null;

    /// <summary>
    /// 读取结构体
    /// </summary>
    private struct testStruct
    {
        public bool BOOL1;
        public bool BOOL2;
        public byte BYTE1;
        public byte BYTE2;
        public ushort WORD1;
        public ushort WORD2;
        public double FLOAD1;
        public double FLOAD2;
        public uint MD10;
        public uint MD11;
        public ushort WORD30;
        public ushort WORD31;
        public ushort WORD32;
        public ushort WORD33;
        public ushort WORD34;
        public ushort WORD35;
        public ushort WORD36;
        public ushort WORD37;
        public ushort WORD38;
    }

    //DB3块的结构体
    private struct testStructDB3
    {
        public bool BOOL_1;
        public bool BOOL_2;
        public ushort WORD_1;
        public ushort WORD_2;
    }

    #endregion




    public PlcForm()
    {
        InitializeComponent();

        #region 一开始对下拉框赋值
        //PLC的型号
        XHText.DataSource = Enum.GetNames(typeof(CpuType));
        XHText.SelectedIndex = 4;

        //读取的方法选项
        DQFFText.DataSource = Enum.GetNames(typeof(DQFS));
        DQFFText.SelectedIndex = 0;


        //写入的方法选项
        XRFFText.DataSource = Enum.GetNames(typeof(XRFS));
        XRFFText.SelectedIndex = 0;

        //读取
        DQFSText.SelectedIndex = 0;

        //写入
        XRFSText.SelectedIndex = 0;

        //读取数据类型
        SJLXText.SelectedIndex = 0;

        //写入数据类型
        XRSJLXText.SelectedIndex = 0;

        #endregion


    }


    /// <summary>
    /// 连接PLC
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    private void button1_Click(object sender, EventArgs e)
    {
        try
        {
            CpuType cpuType = (CpuType)Enum.Parse(typeof(CpuType), XHText.Text, true);

            myplc = new Plc(cpuType, IPText.Text, short.Parse(JTHText.Text.ToString()), short.Parse(CCHText.Text.ToString()));

            myplc.Open();

            if (myplc.IsConnected == false)
            {
                MessageBox.Show("连接失败");
                return;
            }
            else
            {
                MessageBox.Show("连接成功");

                IPText.Enabled = false;
                DKText.Enabled = false;
                XHText.Enabled = false;
                JTHText.Enabled = false;
                CCHText.Enabled = false;
                LJBut.Enabled = false;

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

    /// <summary>
    /// 断开连接PLC
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    private void DkBut_Click(object sender, EventArgs e)
    {
        try
        {
            if (myplc != null)
            {
                myplc.Close();
                IPText.Enabled = true;
                DKText.Enabled = true;
                XHText.Enabled = true;
                JTHText.Enabled = true;
                CCHText.Enabled = true;
                LJBut.Enabled = true;
                MessageBox.Show("已断开连接！");
            }
        }
        catch (Exception ex)
        {
            MessageBox.Show(ex.Message);
        }
    }

    #region 读取
    /// <summary>
    /// 读取PLC
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    private void QCBut_Click(object sender, EventArgs e)
    {
        ValueText.Clear();
    }

    /// <summary>
    /// 读取按钮
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    private void DDQBut_Click(object sender, EventArgs e)
    {
        try
        {
            if (myplc == null || myplc.IsConnected == false)
            {
                MessageBox.Show("未连接，不能读取");
                return;
            }

            switch (DQFFText.SelectedIndex)
            {
                //按Read
                case 0:

                    switch (DQFSText.SelectedIndex)
                    {
                        ///一个一个读取按照DB1.DBX0.0
                        case 0:
                            if (DZText1.Text == string.Empty)
                            {
                                MessageBox.Show("请输入:DB块地址");
                                return;
                            }
                            GetReadValue(true);