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基于ModbusTCP与西门子PLC通讯项目案例

news 2025/6/28 22:06:43

一、西门子PLC仿真环境搭建

【1.1】创建PLC项目

【1.2】编写PLC程序

二、C#代码编写

【2.1】窗口制作

【2.2】效果演示

【2.3】读取源码

【2.4】FrmSiemensSet源码

【2.5】Variable源码

一、西门子PLC仿真环境搭建

【1.1】创建PLC项目

搭建PLCSIM-Advacend模拟仿真

设置PLC的IP地址和PLCSIM一致

勾选GET/PUT(如果是S7协议必须勾选)选项

勾选块编译时仿真

创建变量用于测试，相关的DB块需要设置为去除优化访问

【1.2】编写PLC程序

【PLC作为服务器】

【Modbus Poll测试】

二、C#代码编写

【2.1】窗口制作

【2.2】效果演示

【2.3】读取源码

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

using Approach.DataConvertLib;
using Approach.ModbusTCPLib;

namespace Approach.ModbusTCP
{public partial class FrmSiemens : Form{/// <summary>/// 【字段】ModbusTCP连接对象/// </summary>private ModbusTcp _modbusTcp = new ModbusTcp();
/// <summary>/// 【字段】ModbusTCP连接成功标识/// </summary>private bool _isConnected = false;
/// <summary>/// 【字段】多线程取消对象/// </summary>private CancellationTokenSource _cts = null;
public FrmSiemens(){InitializeComponent();}
/// <summary>/// 【控件事件】建立连接/// </summary>/// <param name="sender"></param>/// <param name="e"></param>private void btn_Connect_Click(object sender, EventArgs e){// 获取UI信息string plcIp = txt_Ip.Text.Trim();int plcPort = int.Parse(txt_Port.Text.Trim());
_isConnected = _modbusTcp.Connect(plcIp, plcPort);if (_isConnected == true){MessageBox.Show("与西门子PLC连接成功！", "连接提示");// 开启线程(创建取消线程对象)_cts = new CancellationTokenSource();// 开启线程(创建线程对象)Task.Run(new Action(() =>{PlcCommunicatin();}), _cts.Token);}else{MessageBox.Show("与西门子PLC连接失败！", "连接提示");}}
/// <summary>/// 【方法】与PLC进行通信的线程方法/// </summary>private void PlcCommunicatin(){// 线程循环执行while(!_cts.IsCancellationRequested){// 通过ModbusTCP读取寄存器信息(PLC发送182字节->读取91个字)byte[] readData = _modbusTcp.ReadOutputRegisters(0, 91);// 读取对应的字节个数if(readData != null && readData.Length == 182) // 读取成功{// 解析报文，跟新UI数据Invoke(new Action(() => {UpdateUI(readData, gb_Read);UpdateUI(readData, gb_Write);}));}}}
/// <summary>/// 【方法】/// </summary>/// <param name="data"> 被处理的数据字节数组 </param>/// <param name="conrtol"> 控件对象 </param>private void UpdateUI(byte[] data, Control control){if (!control.HasChildren)return;
// 程序走到这里说明：Control控件中包含一个或者多个子控件foreach (var item in control.Controls.OfType<Label>()){// 排除掉一些标签控件if (item.Tag == null || item.Tag.ToString().Length == 0)continue;// 程序走到这里说明：获取的控件是需要进行操作的控件Variable variable = GetVariableByTag(item.Tag.ToString());if (variable != null){switch (variable.ValueType){case DataType.Bool:{item.BackColor = BitLib.GetBitFromByteArray(data, variable.Start, variable.OffsetOrLength) == true ? Color.LimeGreen : Color.Red;break;}case DataType.Byte:{item.Text = ByteLib.GetByteFromByteArray(data, variable.Start).ToString();break;}case DataType.Short:{item.Text = ShortLib.GetShortFromByteArray(data, variable.Start).ToString();break;}case DataType.UShort:{item.Text = UShortLib.GetUShortFromByteArray(data, variable.Start).ToString();break;}case DataType.Int:{item.Text = IntLib.GetIntFromByteArray(data, variable.Start).ToString();break;}case DataType.UInt:{item.Text = UIntLib.GetUIntFromByteArray(data, variable.Start).ToString();break;}case DataType.Float:{item.Text = FloatLib.GetFloatFromByteArray(data, variable.Start).ToString();break;}case DataType.Double:{item.Text = DoubleLib.GetDoubleFromByteArray(data, variable.Start).ToString();break;}case DataType.Long:{item.Text = LongLib.GetLongFromByteArray(data, variable.Start).ToString();break;}case DataType.ULong:{item.Text = ULongLib.GetULongFromByteArray(data, variable.Start).ToString();break;}case DataType.String:{item.Text = StringLib.GetSiemensStringFromByteArray(data, variable.Start, variable.OffsetOrLength);break;}}}}}
/// <summary>/// 【方法】解析Lable->Tag的内容，将其转换为Variable这个类/// </summary>/// <param name="tagText"></param>/// <returns></returns>private Variable GetVariableByTag(string tagText){if (!tagText.Contains(";"))return null;
// 程序走到这里说明该控件Tag内容是可以解析的string[] values = tagText.Split(';'); // 分割字符串if (values.Length != 3)return null;
try{return new Variable(){ValueType = (DataType)Convert.ToInt32(values[0]),Start = Convert.ToInt32(values[1]),OffsetOrLength = Convert.ToInt32(values[2])};}catch (Exception){return null;}}
/// <summary>/// 【控件事件】断开连接/// </summary>/// <param name="sender"></param>/// <param name="e"></param>private void btn_DisConnect_Click(object sender, EventArgs e){if (_isConnected == true){_modbusTcp.DisConnect();}}
/// <summary>/// 【控件事件】双击Label控件弹出数据修改对话框/// </summary>/// <param name="sender"></param>/// <param name="e"></param>private void CommonModify_DoubleClick(object sender, EventArgs e){if(sender is Label label){if (label.Tag == null || label.Tag.ToString().Length <= 0)return;
// 程序走到这里说明：Label的Tag的值可以解析// 获取源值string srcValue = label.Text;// 获取Variable对象Variable variable = GetVariableByTag(label.Tag.ToString());FrmSiemensSet frmSiemensSet = new FrmSiemensSet(srcValue, variable, _modbusTcp);frmSiemensSet.ShowDialog();}}}
}

【2.4】FrmSiemensSet源码

using Approach.DataConvertLib;
using Approach.ModbusTCPLib;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace Approach.ModbusTCP
{public partial class FrmSiemensSet : Form{private Variable _variable = null;private ModbusTcp _modbusTcp = null;
public FrmSiemensSet(string srcValue, Variable variable, ModbusTcp modbusTcp){InitializeComponent();lbl_SrcValue.Text = srcValue;lbl_ValueType.Text = variable.ValueType.ToString();
_variable = variable;_modbusTcp = modbusTcp;}


private void btn_Ok_Click(object sender, EventArgs e){bool bResult = false;try{switch (_variable.ValueType){case DataType.Short:{bResult = _modbusTcp.PreSetSingleRegister((ushort)(_variable.Start / 2), Convert.ToInt16(txt_SetValue.Text.Trim()));break;}case DataType.UShort:{bResult = _modbusTcp.PreSetSingleRegister((ushort)(_variable.Start / 2), Convert.ToInt16(txt_SetValue.Text.Trim()));break;}case DataType.Int:{bResult = _modbusTcp.PreSetMultiRegisters((ushort)(_variable.Start / 2), ByteArrayLib.GetByteArrayFromInt(Convert.ToInt32(txt_SetValue.Text.Trim())));break;}case DataType.UInt:{bResult = _modbusTcp.PreSetMultiRegisters((ushort)(_variable.Start / 2), ByteArrayLib.GetByteArrayFromUInt(Convert.ToUInt32(txt_SetValue.Text.Trim())));break;}case DataType.Float:{bResult = _modbusTcp.PreSetMultiRegisters((ushort)(_variable.Start / 2), ByteArrayLib.GetByteArrayFromFloat(Convert.ToSingle(txt_SetValue.Text.Trim())));break;}case DataType.Double:{bResult = _modbusTcp.PreSetMultiRegisters((ushort)(_variable.Start / 2), ByteArrayLib.GetByteArrayFromDouble(Convert.ToDouble(txt_SetValue.Text.Trim())));break;}case DataType.Long:{bResult = _modbusTcp.PreSetMultiRegisters((ushort)(_variable.Start / 2), ByteArrayLib.GetByteArrayFromLong(Convert.ToInt64(txt_SetValue.Text.Trim())));break;}case DataType.ULong:{bResult = _modbusTcp.PreSetMultiRegisters((ushort)(_variable.Start / 2), ByteArrayLib.GetByteArrayFromULong(Convert.ToUInt64(txt_SetValue.Text.Trim())));break;}case DataType.String:{bResult = _modbusTcp.PreSetMultiRegisters((ushort)(_variable.Start / 2), ByteArrayLib.GetByteArrayFromSiemensString(txt_SetValue.Text.Trim()));break;}default:{MessageBox.Show("不支持该数据类型写入", "参数设置");return;}}}catch(Exception ex){MessageBox.Show("请检查参数数据类型是否正确：" + ex.Message, "参数设置");return;}
if (bResult == true){this.DialogResult = DialogResult.OK;}}private void btn_Cancel_Click(object sender, EventArgs e){this.DialogResult = DialogResult.Cancel;}
private void FrmSiemensSet_KeyDown(object sender, KeyEventArgs e){if (e.KeyCode == Keys.Enter)btn_Ok_Click(null, null);}}
}

【2.5】Variable源码

using Approach.DataConvertLib;
using Microsoft.Win32;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Approach.ModbusTCP
{/// <summary>/// 变量实体类封装/// </summary>public class Variable{/// <summary>/// 标签名称/// </summary>public string ValueName { get; set; }
/// <summary>/// 起始字节/// </summary>public int Start { get; set; }
/// <summary>/// 数据类型/// </summary>public DataType ValueType { get; set; }
/// <summary>/// (位偏移)或(字符串)长度/// </summary>public int OffsetOrLength { get; set; }
/// <summary>/// 变量实际值/// </summary>public object Value { get; set; }}
}

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