C# 使用modbus 读取PLC 寄存器地址的方法
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2022-06-15 19:11:23
使用的组件nmodbus定义参数,全局变量://创建modbus实体对象 private static modbusfactory modbusfactory; priva...
使用的组件nmodbus
定义参数,全局变量:
//创建modbus实体对象 private static modbusfactory modbusfactory; private static imodbusmaster master; //写线圈或写寄存器数组 bool[] coilsbuffer; ushort[] registerbuffer; //功能码 string functioncode; //参数(分别为站号,起始地址,长度) byte slaveaddress; ushort startaddress; ushort numberofpoints; //ip 地址与端口号 string ipaddress = string.empty; int visitport = 502;
初始化参数,创建连接:
private void connection(object sender, eventargs e) { try { //plc连接配置信息,plc ip地址 ipaddress =127.0.0.1; //端口,modbus 默认502,根据实际情况填写 visitport =502; //初始化modbusmaster modbusfactory = new modbusfactory(); //在本地测试 所以使用回环地址,modbus协议规定端口号 502 master = modbusfactory.createmaster(new tcpclient(ipaddress, visitport)); //设置读取超时时间 master.transport.readtimeout = 10000; master.transport.retries = 2000; } catch (exception ex) { messagebox.show(ex.message); } }
初始化读写参数
/// <summary> /// 初始化读参数 /// </summary> private void setreadparameters(int slaveaddress=1,int startaddress=200,int numberofpoints=1) { //deviceid slaveaddress = byte.parse(slaveaddress); //起始地址, startaddress = ushort.parse(startaddress); //数据长度 numberofpoints = ushort.parse(numberofpoints); }
运行读取方法
private async void executefunction() { try { //moddbus共有这些功能码 //01 read coils //02 read discrete inputs //03 read holding registers //04 read input registers //05 write single coil //06 write single registers //0f write multiple coils //10 write multiple registers functioncode="01 read coils";//根据实际点号类型选择读写功能码 //重新实例化是为了 modbus slave更换连接时不报错 //master = modbusfactory.createmaster(new tcpclient(ipaddress, visitport)); if (functioncode != null) { switch (functioncode) { case "01 read coils"://读取单个线圈 setreadparameters(); coilsbuffer = master.readcoils(slaveaddress, startaddress, numberofpoints); for (int i = 0; i < coilsbuffer.length; i++) { setmsg(coilsbuffer[i] + " "); } setmsg("\r\n"); break; case "02 read discrete inputs"://读取输入线圈/离散量线圈 setreadparameters(); coilsbuffer = master.readinputs(slaveaddress, startaddress, numberofpoints); for (int i = 0; i < coilsbuffer.length; i++) { setmsg(coilsbuffer[i] + " "); } setmsg("\r\n"); break; case "03 read holding registers"://读取保持寄存器 setreadparameters(); registerbuffer = master.readholdingregisters(slaveaddress, startaddress, numberofpoints); for (int i = 0; i < registerbuffer.length; i++) { setmsg(registerbuffer[i] + " "); } setmsg("\r\n"); break; case "04 read input registers"://读取输入寄存器 setreadparameters(); registerbuffer = master.readinputregisters(slaveaddress, startaddress, numberofpoints); for (int i = 0; i < registerbuffer.length; i++) { setmsg(registerbuffer[i] + " "); } setmsg("\r\n"); break; case "05 write single coil"://写单个线圈 setwriteparametes(); await master.writesinglecoilasync(slaveaddress, startaddress, coilsbuffer[0]); break; case "06 write single registers"://写单个输入线圈/离散量线圈 setwriteparametes(); await master.writesingleregisterasync(slaveaddress, startaddress, registerbuffer[0]); break; case "0f write multiple coils"://写一组线圈 setwriteparametes(); await master.writemultiplecoilsasync(slaveaddress, startaddress, coilsbuffer); break; case "10 write multiple registers"://写一组保持寄存器 setwriteparametes(); await master.writemultipleregistersasync(slaveaddress, startaddress, registerbuffer); break; default: break; } } else { messagebox.show("请选择功能码!"); } master.dispose(); } catch (exception ex) { messagebox.show(ex.message); } }
//展示消息
/// <summary> /// setmessage /// </summary> /// <param name="msg"></param> public void setmsg(string msg) { messagebox.show(msg); }
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