Failure and replacement of components during operation
16.2 Failure and replacement of components during operation
S7-400H
274 System Manual, 03/2012, A5E00267695-11
Procedure
The double error described results in loss of redundancy. In this event proceed as follows:
Step What has to be done? 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
subsystem goes out.
4 Start the CPU (for example Start from
programming device or STOP - RUN).
The CPU performs an automatic LINK-
UP and UPDATE.
The CPU changes to RUN (redundant
system mode) and operates as reserve
CPU.
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