通过MODBUS TCP读写PLC源码.doc

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通过 MODBUS TCP 读写 PLC 源码功能模块一：读写 PLC 主模块 using System; using System.Net; using System.Net.Sockets; using System.Windows.Forms; ///

/// 通过 modbus TCP 读写 PLC 数据, /// /// 设计:张东启,2011.4.9 /// 2011.5.13 更新,加入 Application.DoEvents();以防连续读写时引起前台反应迟顿,同时让 PLC 有处理等待时间 /// /// /// ///

public class PLCFunction { public static bool Connected = false; public static int trytimes = 0; //内部使用变量 private static byte[] sendBuf = { 0, 0, 0, 0, 0, 06, 255, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }; //共 20 个字节 private static byte[] recBuf = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }; //共 20 个字节 private static int hi, low, bytes, hi1, low1; private static Socket zdqSocket; private static string tiaoshi="N"; private static string plcAddress = "127.0.0.1"; public static int ReadWord(int mwAddress) { int rtValue = -99; if (init_plc() == 0) { try { hi = mwAddress / 256; low = mwAddress - hi * 256;

sendBuf[7] = 3; sendBuf[8] = (byte)hi; sendBuf[9] = (byte)low; sendBuf[10] = 0; sendBuf[11] = 1; //发送查询 zdqSocket.Send(sendBuf, 12, 0); Application.DoEvents(); bytes = zdqSocket.Receive(recBuf, 11, 0); if (bytes == 11) { hi = recBuf[9]; low = recBuf[10]; rtValue = hi * 256 + low; //返回 11 个字节 } trytimes = 0; } catch (Exception te) { if (tiaoshi == "Y") MessageBox.Show(te.ToString()); trytimes++; } } return rtValue; } public static void WriteWord(int mwAddress,int mwValue) { if (init_plc() == 0) { try { hi = mwAddress / 256; low = mwAddress - hi * 256; hi1 = mwValue / 256; low1 = mwValue - hi * 256; sendBuf[7] = 6; sendBuf[8] = (byte)hi; sendBuf[9] = (byte)low; sendBuf[10] = (byte)hi1; sendBuf[11] = (byte)low1; zdqSocket.Send(sendBuf, 12, 0); Application.DoEvents(); bytes = zdqSocket.Receive(recBuf, recBuf.Length, 0); trytimes = 0; } //写一个字返回几个?

catch (Exception te) { if (tiaoshi == "Y") MessageBox.Show(te.ToString()); trytimes++; } } } public static int GetMemory(int mwAddress) { int rtValue = -99; if (init_plc() == 0) { try { hi = mwAddress / 256; low = mwAddress - hi * 256; sendBuf[7] = 2; sendBuf[8] = (byte)hi; sendBuf[9] = (byte)low; sendBuf[10] = 0; sendBuf[11] = 1; //发送查询 zdqSocket.Send(sendBuf, 12, 0); Application.DoEvents(); bytes = zdqSocket.Receive(recBuf, 10, 0); if (bytes == 10) { //返回 11 个字节 hi = recBuf[9]; rtValue = hi; } trytimes = 0; } catch (Exception te) { if (tiaoshi == "Y") MessageBox.Show(te.ToString()); trytimes++; } } return rtValue; } public static void SetMemory(int mwAddress,int mFlag) { if (init_plc() == 0)

{ //线圈置位与复位 int mBit = 0; if (mFlag == 1) mBit = 255; else mBit = 0; try { hi = mwAddress / 256; low = mwAddress - hi * 256; sendBuf[7] = 5; sendBuf[8] = (byte)hi; sendBuf[9] = (byte)low; sendBuf[10] = (byte)mBit; sendBuf[11] = 0; zdqSocket.Send(sendBuf, 12, 0); Application.DoEvents(); bytes = zdqSocket.Receive(recBuf, recBuf.Length, 0); trytimes = 0; } catch (Exception te) { if (tiaoshi == "Y") MessageBox.Show(te.ToString()); trytimes++; } } } private static int init_plc() { //初始化 int zdqrt = 0; if (trytimes > 3) { //超过 3 次自动恢复连接 if (zdqSocket.Connected == true) zdqSocket.Disconnect(false); zdqSocket = null; trytimes = 0; } try { if (zdqSocket == null) { zdqSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp); zdqSocket.ReceiveTimeout = int.Parse(zdqpro.WriteOrReadINI("系统设置", "接收

超时")); plcAddress = zdqpro.WriteOrReadINI("系统设置", "PLC 地址"); } if (zdqSocket.Connected == false) { //重新连接 tiaoshi = zdqpro.WriteOrReadINI("系统设置", "PLC 调试"); zdqSocket.Connect(plcAddress, 502); } } catch (Exception te) { if (tiaoshi == "Y") MessageBox.Show(te.ToString()); trytimes++; zdqrt = -1; } Connected = zdqSocket.Connected;//是否已经连接 Application.DoEvents(); return zdqrt; } } 读写配置文件功能代码 public static string WriteOrReadINI(string rootNod, string valueNod) { //读取配置文件 XmlDocument mydoc = new XmlDocument(); mydoc.Load("zdqsys.ini"); string str1 = rootNod + "/" + valueNod; string rt = mydoc.SelectSingleNode(str1).InnerText; return rt; } public static void WriteOrReadINI(string rootNod, string valueNod, string valueStr) { //写入配置文件 XmlDocument mydoc = new XmlDocument(); mydoc.Load("zdqsys.ini"); string str1 = rootNod + "/" + valueNod; XmlNode mynod = mydoc.SelectSingleNode(str1); mynod.InnerText = valueStr; mydoc.Save("zdqsys.ini"); }

配置文件 zdqsys.ini 内容如下： <系统设置> 192.168.1.200 <接收超时>10 N 希望能与工控爱好者或相关开发人员相互交流切搓，不当之处敬请指教。张东启 2011.5.15

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