Failure and replacement of components during operation
16.2 Failure and replacement of components during operation
S7-400H
System Manual, 03/2012, A5E00267695-11
273
Step What has to be done? How does the system react?
6 Start the reserve CPU (for example, STOP-
RUN or Start using the programming device).
The following responses are possible:
1. CPU changes to RUN mode.
2. CPU changes to STOP mode. In this
case continue at step 7.
7 If the reserve CPU changed to STOP in step
6:
Remove the synchronization module from the
master CPU.
The master CPU processes swapping
interrupt OB 83 and redundancy error
OB 72 (entering state).
8 Insert the new synchronization module into
the master CPU.
The master CPU processes swapping
interrupt OB 83 and redundancy error
OB 72 (exiting state).
9 Plug in the fiber-optic cable connections of
the synchronization modules.
–
10 Start the reserve CPU (for example, STOP-
RUN or Start using the programming device).
The CPU performs an automatic LINK-
UP and UPDATE.
The CPU changes to RUN (redundant
system mode) and operates as reserve
CPU.
Note
If both fiber-optic cables or synchronization modules are damaged or replaced one after the
other, the system responses are the same as described above.
The only exception is that the reserve CPU does not change to STOP but instead requests a
memory reset.
Starting situation
Failure How does the system react?
Failure of both fiber-optic cables or
synchronization modules:
The S7-400H is in redundant system mode and
both fiber-optic cables or synchronization
modules fail.
Both CPUs report the event in the diagnostic
buffer and via OB 72.
Both CPUs become the master CPU and
remain in RUN mode.
The LED Link1 OK or Link2 OK on the
synchronization module is lit.
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