Hello, I am building an application that communicates with plc through modbus tcp.
I can read registers and coils, with all commands (1-4).
My problem is that I have not found a way to get diagnostics messages from plc. Modbus_TCP_Standard refairs in fc 08 command..
My questions are,
1. DOes this commands works really under modbus tcp? Ι read modbus rtu and says that diagnositcs do not work at modbus tcp
2. HAve you any idea, what command should I send to get communication messages ?
Best regards
I can read registers and coils, with all commands (1-4).
My problem is that I have not found a way to get diagnostics messages from plc. Modbus_TCP_Standard refairs in fc 08 command..
My questions are,
1. DOes this commands works really under modbus tcp? Ι read modbus rtu and says that diagnositcs do not work at modbus tcp
2. HAve you any idea, what command should I send to get communication messages ?
Best regards