Hi panic,
Solved!
yes it is intuitive, infact I soon thought that default I/O was the Module 3.
But if you call "John" in primary, I expect "john" in the secondary.
However, I solved. The problem was on PLC. This type of PLC codesys-based require a certain configuration and declaration of the mapped variable otherwise The communication Not working.
Here the picture of the exchanged variable.
MAny Thanks for your support and for your time.