Modbus TCP M340 - Siemens Sentron PAC3200

Hi everybody!

I'm trying to communicate via modbus TCP an M340 and a Siemens Sentron PAC3200. I've tried with the I/O scanning and with the command 'read_var', buy I haven't been able to communicate.
By the way, with a free utility called 'simply modbus TCP' the Siemens answers all Modbus commands perfectly.
Have anybody tried to do this?
Thank you very much.

Víctor

Just a quick thought - did you set the unit id. i/o scanning defaults to 255 maybe try 1.
I have been caught on SEW which need a unit id of 0, unfortunately this is an invalid id (in modbus 0 is a broadcast message). Hopefully the Siemens device wont have this problem.

I've tried and it works.
Thank you so much.
You have two beers paid in Spain!
Thank you again.
Víctor.

Consulta

Hello everybody!! I have the same problem as you, how did you solve it? I have no success neither using an M340 nor a Premium PLC, neither using I/O Scanning nor using READ_VAR() or DATA_EXCH().
Any opinion or idea??
Regards.