Siemens SIMATIC CPU 410 System Manual page 229

Starting situation
Failure
Failure of a fiber-optic cable or synchronization
module:
The S7-400H is in the redundant system state
and a fiber-optic cable or synchronization module
fails.
See also chapter Synchronization modules for
the CPU 410. (Page 239).
Procedure
Follow the steps below to replace a fiber-optic cable:
Step
1
2
Follow the steps below to replace a synchronization module:
Step
1
2
3
CPU 410 Process Automation/CPU 410 SMART
System Manual, 05/2017, A5E31622160-AC
Replacement of failed components during redundant operation
What to do?
Look for the cause of the error along the path
for which the IFMxF LEDs are lit on both
CPUs:
IFM1F: Upper sync modules in CPU rack 0
or rack 1 or corresponding synchronization
cable.
IFM2F: Lower sync modules in CPU rack 0
or rack 1 or corresponding synchronization
cable.
First, check the fiber-optic cable.
If the fiber-optic cable is defective, replace it.
What to do?
Replace the synchronization module on the
CPU on which the LED Linkx-OK is still lit.
Plug in the fiber-optic cable connections of
the synchronization modules.
Start the standby CPU
13.1 Replacement of central components
How does the system react?
Master CPU reports the event in the diagnos-
•
tic buffer and through OB 72 or OB 82.
The standby CPU switches to ERROR-
•
SEARCH operating state for a few minutes. If
the error is eliminated during this time, the
standby CPU switches to redundant system
mode, otherwise it switches to STOP.
One of the two LEDs Link1 OK or Link2 OK is
•
lit
One of the two LEDs IFM1F or IFM2F is lit
How does the system react?
-
The IFMxF LEDs on both CPUs go out.
How does the system react?
-
The LEDs IFMxF go out.
•
If the LED should not go out, you must
replace the synchronization module on
the other CPU.
Both CPUs report the event in the diag-
•
nostic buffer
The system status now changes to Redun-
dant mode.
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