So, during testing of the system...here you see the last pictureof the control unit,

i have to accept that testing the system in this structure is impossible. I am not able to access all measure points of all modules. The little board on the right side of the bus is the state machine of the NOP command. The whole structure should be able to run the NOP command in a infinite loop.

So i disassembled the system to test all modules again...and I will use another structure to mount all modules together.