integration
Member
Hi all,
I am trying to do Modbus communications via the CB1241 RS485 Communication Board on a Siemens S71200 PLC. I am using a 1215C CPU. After configuring the hardware and writing a program for the MODBUS communication I can successfully compile and download to the PLC. However, the LED indicators for RxD and TxD on the communication board do not light up.
I have checked my configuration and when I take the PLC online I can verify via TIA Portal that the PLC has recognized the module however it just is not transmitting and receiving data since the LEDs aren't lighting up on the board. In my program, the functions "MB_COMM_LOAD" and "MB_MASTER" both have no error and have a 16#0000 Status. Any ideas on what the issue could be or where I am going wrong?
I am trying to do Modbus communications via the CB1241 RS485 Communication Board on a Siemens S71200 PLC. I am using a 1215C CPU. After configuring the hardware and writing a program for the MODBUS communication I can successfully compile and download to the PLC. However, the LED indicators for RxD and TxD on the communication board do not light up.
I have checked my configuration and when I take the PLC online I can verify via TIA Portal that the PLC has recognized the module however it just is not transmitting and receiving data since the LEDs aren't lighting up on the board. In my program, the functions "MB_COMM_LOAD" and "MB_MASTER" both have no error and have a 16#0000 Status. Any ideas on what the issue could be or where I am going wrong?