What do you mean by "bus" inputs and "bus" output?
Thank you Raven for your help,
I called a person from Phoenix Contact and he told me to change some parameters inside the module. Now it's working well.
When I want to read: Function code=3, Address=8000, Quantity=1
When I want to write: Function code=6, Address=8001, Quantity=1
To help anyone with same trouble:
access to the node configuration p.e. web
set off plug&play option
set 0 Process Data Watchdog Timeout
then have a good work