Failure And Replacement Of A Communication Module - Siemens SIMATIC S7-400H System Manual

16.2.4

Failure and replacement of a communication module

This section describes the failure and replacement of communication modules for
PROFIBUS and Industrial Ethernet.
The failure and replacement of communication modules for PROFIBUS DP are described in
section Failure and replacement of a PROFIBUS DP master (Page 276).
Starting situation
Failure
The S7-400H is in redundant system mode and a
communication module fails.
Procedure
If you want to use a communication module that is already being used by another system,
you have to ensure that there are no parameter data saved in the module's integrated
FLASH-EPROM before you swap it.
Proceed as follows to replace a communication module for PROFIBUS or Industrial
Ethernet:
Step
1
2
3
S7-400H
System Manual, 03/2012, A5E00267695-11
16.2 Failure and replacement of components during operation
What has to be done?
Remove the module.
Insert the new module.
Turn the module back on.
Failure and replacement of components during operation
How does the system react?
Both CPUs report the event in the diagnostic

buffer and via appropriate OBs.
In communication via standard connections:

Connection failed
In communication via redundant connections:

Communication is maintained without
interruption over an alternate channel.
How does the system react?
Both CPUs process the swapping

interrupt OB 83 synchronized with each
other.
Both CPUs process the swapping

interrupt OB 83 synchronized with each
other.
The module is automatically configured by

the appropriate CPU.
The module resumes communication

(system establishes communication
connection automatically).
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