Replacement of failed components during redundant operation
13.1 Replacement of central components
CPU 410 Process Automation/CPU 410 SMART
System Manual, 05/2017, A5E31622160-AC
229
How does the system react?
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).
• 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
Follow the steps below to replace a fiber-optic cable:
How does the system react?
1
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.
The IFMxF LEDs on both CPUs go out.
Follow the steps below to replace a synchronization module:
How does the system react?
1 Replace the synchronization module on the
CPU on which the LED Linkx-OK is still lit.
-
2 Plug in the fiber-optic cable connections of
the synchronization modules.
• 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
3 Start the standby CPU The system status now changes to Redun-
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