Siemens SIMATIC S7-400H Manual page 218

Failure and Replacement of Components During Operation
10.2.2 Failure and Replacement of a Redundant PROFIBUS-DP
Interface Module
Initial situation
The S7-400H is in redundant system mode
and a PROFIBUS-DP interface module (IM
153-2, IM 157) fails.
Replacement procedure
To replace PROFIBUS-DP interface module, perform the following steps:
Step
1
2
3
4
10-14
Failure
What Has To Be Done?
Turn off the supply for the affected DP
interface module.
Unplug the connected bus connector.
Insert the new DP Profibus interface
module and turn the supply back on.
Plug the bus connector back on.
How Does the System React?
Both CPUs report the event in the
diagnostics buffer and via OB 70.
How Does the System React?
-
-
•
CPUs process the mounting rack
failure OB 70 in synchronism
(outgoing event).
•
Redundant access to the station is
again possible for the system.
Automation System S7-400H Fault-tolerant Systems
-
A5E00068197-07