Issue with Mesa 5i25 - 7i76 configuration

Can I connect it to the +5V of TB2 on the board?

Yes, that is what the 5VP pins are TB2 and TB3 are for.

Hello,
thank you very much for all your responses.
I have modified the wiring of my drivers as you advised. That has already solved one problem, but there seems to be another one as the motors are not rotating.
I don't even have the impression that my 5I25 and 7I76 are communicating with each other. Is there a way to clarify this?
Do you have any other ideas about errors I might have made?

There are still photos showing the current state in a link from the first message of this thread. I am available to provide more details and photos.

I notice in your picture of the 7I76, W2 is in the left-hand position
This is wrong if you are supplying 5V to the 7I76 power via TB3
(7I76 manual page 2)

A simple hardware sanity check is to run LinuxCNC and jog in both directions
and check that the associated DIR signals on TB2 change

Hello, there's no 5V alimentation on TB3 the only one i have is 12V on TB1 for I/O

Any suggestion ? Is there an error and should i change the position of W2 ? If not do you (all) have any other advice !

Thanks for your answer !

OK I think I mixed that up with a different thread

I would leave it as it is and check that direction changes
as mentioned.