Replacement of failed components during redundant operation
13.1 Replacement of central components
CPU 410 Process Automation/CPU 410 SMART
230
System Manual, 05/2017, A5E31622160-AC
Starting situation
Failure
How does the system react?
Simultaneous failure of both fiber-optic cables
The S7-400H is in the redundant system state
and both fiber-optic cables fail.
•
Both CPUs report the event in the diagnostic
buffer and via OB 72.
•
Both CPUs become master CPU and remain
in RUN.
•
The LEDs IFM1F and IFM2F are lit on both
CPUs.
Procedure
The described double fault results in loss of redundancy and partial or complete failure of
switched DP or PN I/O. In this event proceed as follows:
Step
What to do?
How does the system react?
1
Switch off one subsystem.
-
2
Replace the faulty components.
-
3
Turn the subsystem back on.
•
LEDs IFM1F and IFMF2F go off. The
LED MSTR of the switched on subsys-
tem goes out.
4
Start the CPU.
•
The CPU performs an automatic LINK-
UP and UPDATE.
•
The CPU switches to RUN (redundant
system state) and operates as standby
CPU.