Siemens CPU 410-5H Process Automation System Manual page 173

Starting situation
Failure
Failure of a fiber-optic cable or synchronization
module:
The S7-400H is in redundant system mode and a
fiber-optic cable or synchronization module fails.
See also chapter Synchronization modules for
the CPU 410-5H (Page 181).
Procedure
Follow the steps below to replace a synchronization module or fiber-optic cable:
Step
1
2
3
4
5
6
7
8
CPU 410-5H Process Automation/CPU 410 SMART
System Manual, 10/2013, A5E32631667-AA
Failure and replacement of components during redundant operation
What has to be done?
First, check the fiber-optic cable.
Start the reserve CPU (for example, STOP-
RUN or Start using the programming device).
Remove the faulty synchronization module
from the reserve CPU.
Insert the new synchronization module in the
reserve CPU.
Plug in the fiber-optic cable connections of
the synchronization modules.
Start the reserve CPU (for example, STOP-
RUN or Start using the programming device).
If the reserve CPU changed to STOP in step
6:
Remove the synchronization module from the
master CPU.
Insert the new synchronization module into
the master CPU.
11.1 Failure and replacement of central components
How does the system react?
The master CPU reports the event in the
•
diagnostic buffer and with OB 72 of OB 82.
The reserve CPU changes to ERROR-
•
SEARCH mode for some minutes. If the error
is eliminated during this time, the reserve
CPU switches to redundant system mode,
otherwise it switches to STOP.
The LED Link1 OK or Link2 OK on the
•
synchronization module is lit.
How does the system react?
–
The following responses are possible:
1. CPU changes to RUN mode.
2. CPU changes to STOP mode. In this
case continue at step 3.
–
–
The LED Link1 OK or Link2 OK on the
•
synchronization module goes out.
Both CPUs report the event in the
•
diagnostic buffer
The following responses are possible:
1. CPU changes to RUN mode.
2. CPU changes to STOP mode. In this
case continue at step 7.
The master CPU processes swapping
•
interrupt OB 83 and redundancy error
OB 72 (entering state).
The master CPU processes swapping
•
interrupt OB 83 and redundancy error
OB 72 (exiting state).
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