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