Modbus with tcp to rtu gateway ID forwding

[Kieran B]

Hi there,

I have an installation with 2 softstarters that use rs485 modbus and an ethernet gateway that is the master of that ring

I can send and receive all data needed using Modscan32 over TCP connection on laptop to both softstarters

so far i havent been able to get a response from the softstarter when using the PLC - error code 5 and 4.

SO I guess the question is, does the slave ID get sent along with the 'message' when using modbus ip function blocks, so the gateway knows where to forward the message?

[Joe Tauser]

Yes, the slave is part of the Modbus TCP configuration.

Post your code so we can see what you're doing.

Joe T.