Problem with 2 modbus devices

[Mirco]

Hi guys,
I have an HomeLYnk that read from a PLC that controls an UTA, and write into a PLC that controls pumps, heating and cooling.
I used 2 profile:
- the one that read from the UTA use TCP/IP and works perfectly;
- the one that write some object (readed in the other profile) use RTU;

When the object is updated by the read of the other profile, it is not written into the PLC of the pumps. If I update the value of the object manually, it is written correctly into the PLC.

I bypassed this problem using script, but I would like to know if I've done something wrong  

Thanks!