Failure and replacement of components during operation
16.3 Failure and replacement of components of the distributed I/Os
S7-400H
System Manual, 03/2012, A5E00267695-11
279
Replacement procedure
Proceed as follows to replace PROFIBUS DP cables:
Step What has to be done? How does the system react?
1 Check the cabling and localize the
interrupted PROFIBUS DP cable.
–
2 Replace the defective cable. –
3 Switch the failed modules to RUN
mode.
The CPUs process the error OBs synchronized
with each other
With one-sided I/O:
Rack failure OB 86 (outgoing event)
The DP slaves can be addressed via the
DP master system.
With switched I/O:
I/O redundancy error OB 70 (outgoing
event).
The DP slaves can be addressed via both
DP master systems.
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