.net通过S7.net读写西门子PLC中，字符串，bool,整数，小数及byte型

注：.net中通过TCP/IP方式通过S7.net.dll动态库，连接到西门子PLC，西门子程序中许勾选优化块，程序读取需要 db块号+偏移量

一。使用VS项目，在项目中添加S7.net动态库

代码中引用S7.net动态库

using S7.Net;

实例化PLC服务名

///

/// 实例化PLC

///

Plc S71500;

连接PLC按钮时间编写：

以上代码可测试是否能连接至PLC

二.西门子中点位信息，在程序中地址表示说明

在DB块中有如下变量

/// <summary>/// 实例化PLC/// </summary>Plc S71500;/// <summary>/// 连接PLC/// </summary>/// <param name="sender"></param>/// <param name="e"></param>privatevoidbutton1_Click(object sender,EventArgs e){string ip=tb_plcip.Text.Trim();//PLC地址IP 例192.168.0.1short rack=short.Parse( tb_rack.Text.Trim());//PLC机架位置 默认0short solt =short.Parse(tb_solt.Text.Trim());//PLC插槽位置,以实际为准//CpuType根据实际PLC连接，我这边已1500PLC为例
            S71500 =newPlc(CpuType.S71500, ip, rack, solt);//调用S7.NET中的方法连接PLC
            S71500.Open();//连接成功后使能操作按钮if(S71500.IsConnected){//判断是否连接成功
                MessageBox.Show("连接PLC成功");}}

在程序中读取需DB块号+地址，分别写法如下

DB1.DBW0 //地址为0，类型为整数

DB1.STRING2.18 //地址为2，字符长度18 类型为字符串

DB1.B22 //地址为22，类型为字节型

DB1.DBD24 //地址为24，类型为实数

DB1.DBW28 //地址为28，类型为整数

DB1.DBW28 //地址为28，类型为整数

DB1.DBX29.0 //地址为29.0，类型为布尔

三，通过代码读写Tag点信息，以下代码可进行以上Tag点信息的读取及写入，代码如下：

usingSystem;usingSystem.Collections.Generic;usingSystem.ComponentModel;usingSystem.Data;usingSystem.Drawing;usingSystem.Linq;usingSystem.Text;usingSystem.Text.RegularExpressions;usingSystem.Windows.Forms;usingS7.Net;namespaceWindowsFormsApp1{publicpartialclassForm1:Form{publicForm1(){InitializeComponent();}/// <summary>/// 实例化PLC/// </summary>Plc S71500;/// <summary>/// 连接PLC/// </summary>/// <param name="sender"></param>/// <param name="e"></param>privatevoidbutton1_Click(object sender,EventArgs e){string ip=tb_plcip.Text.Trim();//PLC地址IP 例192.168.0.1short rack=short.Parse( tb_rack.Text.Trim());//PLC机架位置 默认0short solt =short.Parse(tb_solt.Text.Trim());//PLC插槽位置,以实际为准//CpuType根据实际PLC连接，我这边已1500PLC为例
            S71500 =newPlc(CpuType.S71500, ip, rack, solt);//调用S7.NET中的方法连接PLC
            S71500.Open();//连接成功后使能操作按钮if(S71500.IsConnected){//判断是否连接成功
                MessageBox.Show("连接PLC成功");}}//****//读取 ReadPLC("DB1.DBW0");//写入 WritePLC("DB1.DBW0","1");//其中BOOL写入： WritePLC(DB1.DBX29.0, "False");或WritePLC(DB1.DBX29.0, "True");#region  读写TAG点方法/// <summary>/// 去指定字符串中间字符/// </summary>/// <param name="sourse">字符串</param>/// <param name="startstr">首字符</param>/// <param name="endstr">尾字符</param>/// <returns></returns>publicstaticstringMidStrEx(string sourse,string startstr,string endstr){string result =string.Empty;int startindex, endindex;try{
                startindex = sourse.IndexOf(startstr);if(startindex ==-1){return result;}string tmpstr = sourse.Substring(startindex + startstr.Length);
                endindex = tmpstr.IndexOf(endstr);if(endindex ==-1){return result;}
                result = tmpstr.Remove(endindex);}catch(Exception){}return result;}/// <summary>/// 写入PLC数值/// </summary>/// <param name="DataTag"></param>publicvoidWritePLC(string DataTag,string Data){try{#region 逻辑处理string Type ="STRING";if(DataTag.Contains("STRING")){
                    Type ="STRING";}elseif(DataTag.Contains("DBW")){
                    Type ="Word";}elseif(DataTag.Contains(".B")){
                    Type ="Byte";}elseif(DataTag.Contains("DBD")){
                    Type ="Real";}elseif(DataTag.Contains("DBX")){
                    Type ="Bool";}int strAdr =0;//取到db块号int dbInt = dbInt =int.Parse(MidStrEx(DataTag,"DB","."));;//字符串类型if(Type =="STRING"){//取到地址
                    strAdr =int.Parse(MidStrEx(DataTag,"STRING","."));//写入PLC数据
                    S71500.Write(DataType.DataBlock, dbInt, strAdr,GetPLCStringByteArray(Data));}elseif(Type =="Word"){//写入整数型
                    strAdr =int.Parse(Regex.Match(DataTag,@"\d+$").ToString());
                    S71500.Write(DataType.DataBlock, dbInt, strAdr, Convert.ToInt16(Data));}elseif(Type =="Byte"){//写入字节型
                    strAdr =int.Parse(Regex.Match(DataTag,@"\d+$").ToString());
                    S71500.Write(DataType.DataBlock, dbInt, strAdr, Convert.ToByte(Data));}elseif(Type =="Real"){//写入实数
                    strAdr =int.Parse(Regex.Match(DataTag,@"\d+$").ToString());
                    S71500.Write(DataType.DataBlock, dbInt, strAdr, Convert.ToDouble(Data));}elseif(Type =="Bool"){//写入Bool值
                    S71500.Write(DataTag.ToUpper(), Convert.ToBoolean(Data));}#endregion}catch(Exception ex){//写入异常}}int errorCount =0;/// <summary>/// 读取PLC数据/// </summary>/// <param name="DataTag">Tag点名称</param>publicstringReadPLC(string DataTag){string returnData ="";try{if(DataTag.Contains("STRING")){//取到DB块号int dbInt = dbInt =int.Parse(MidStrEx(DataTag,"DB","."));//取到偏移量地址int strAdr =int.Parse(MidStrEx(DataTag,"STRING","."));//获取字符串长度var reservedLength =(byte)S71500.Read(DataType.DataBlock, dbInt, strAdr, VarType.Byte,1);//读取时在地址前加两位偏移string StrReplac =(string)S71500.Read(DataType.DataBlock, dbInt, strAdr +2, VarType.String, reservedLength);//去除字符串后面空白符号
                    returnData = StrReplac.Replace("\0","");}elseif(DataTag.Contains("DBW")){//读取整数型数据ushort UpValue =(ushort)S71500.Read(DataTag);
                    returnData = Convert.ToString(UpValue);}elseif(DataTag.Contains(".B")){//取到DB块号int dbInt = dbInt =int.Parse(MidStrEx(DataTag,"DB","."));//取到偏移量地址int strAdr =int.Parse(Regex.Match(DataTag,@"\d+$").ToString());//获取字符串长度var reservedLength =(byte)S71500.Read(DataType.DataBlock, dbInt, strAdr, VarType.Byte,1);//将读取数据转为字符串
                    returnData = Convert.ToString(reservedLength);}elseif(DataTag.Contains("DBD")){//读取小数型数据double UpValue =((uint)S71500.Read(DataTag)).ConvertToFloat();if(Convert.ToString(UpValue).Trim()!=""){//截取保留小数位长度
                        returnData = Math.Round(UpValue,3).ToString();}}elseif(DataTag.Contains("DBX")){//读取Bool值数据var db1Bool1 = S71500.Read(DataTag);
                    returnData = db1Bool1.ToString();}}catch(Exception ex){//读取异常}return returnData;}/// <summary>/// 获取西门子PLC字符串数组--String/// </summary>/// <param name="str"></param>/// <returns></returns>privatebyte[]GetPLCStringByteArray(string str){byte[]value= Encoding.Default.GetBytes(str);byte[] head =newbyte[2];
            head[0]= Convert.ToByte(254);
            head[1]= Convert.ToByte(str.Length);value= head.Concat(value).ToArray();returnvalue;}/// <summary>/// 获取西门子PLC字符串数组--WString/// </summary>/// <param name="str"></param>/// <returns></returns>privatebyte[]GetPLCWStringByteArray(string str){byte[]value= Encoding.BigEndianUnicode.GetBytes(str);byte[] head = BitConverter.GetBytes((short)508);byte[] length = BitConverter.GetBytes((short)str.Length);
            Array.Reverse(head);
            Array.Reverse(length);
            head = head.Concat(length).ToArray();value= head.Concat(value).ToArray();returnvalue;}#endregion}}