Siemens SIMATIC S7-400H - Failure and Replacement of a Communication Module

Failure and replacement of components during operation
16.2 Failure and replacement of components during operation
S7-400H
System Manual, 03/2012, A5E00267695-11
271
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 How does the system react?
The S7-400H is in redundant system mode and a
communication module fails.
 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.
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 What has to be done? How does the system react?
1 Remove the module.
 Both CPUs process the swapping
interrupt OB 83 synchronized with each
other.
2 Insert the new module.
 Both CPUs process the swapping
interrupt OB 83 synchronized with each
other.
 The module is automatically configured by
the appropriate CPU.
3 Turn the module back on.
 The module resumes communication
(system establishes communication
connection automatically).