使用C＃从Fatek FBs PLC读取离散输入

Question

我有一个Fatek Fbs PLC，离散输入连接到X0（001001）寄存器。我想通过C＃读取这些输入值。我尝试过EasymodbusTCP库，但无法正常工作。

ModbusClient modbusClient = new ModbusClient("190.201.100.100", 502);    modbusClient.Connect(); 
bool[] readCoils = modbusClient.ReadCoils(0,10);
int[] readHoldingRegisters = modbusClient.ReadHoldingRegisters(0,10);
string val=modbusClient.ReadDiscreteInputs(0,1)[0].ToString());  //this line throws exception