Hello,

i have to two identical axis control modules on profibus network to control a press machine with two stage.
hardware failure (axis control module) occurs to one of the stage .someone make a machine opertates with single stage

bypass this axis control module on profibus
how can bypass this hardware failure and make machine treat with one module
my question
how to bypass any module on profibus network without effect to plc program ?

PROFIBUS failure can be bypassed by SFC12,Read more here:

How do you switch off (decouple) a slave without causing an error entry to appear in OB 86/OB 122?

To bypass its interactions with the user program, you need to analyze and trace it and find a remedy.