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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