hello

if I disconnect one of two patch cable in a CPU (s7-400 redundant), what will happen to CPU's?

Does it go to stop mode or it continues processing? Is this same in all cpu versions?

Hello Mehdi,

The reaction is explained clearly in the manual  (Failure and replacement of a synchronization module or fiber-optic cable).

It's the same for all versions.

Best regards,

H-H