Siemens SIMATIC S7-400H Manual page 114

Failure and Replacement of Components During Operation
Starting situation for replacement of the load memory
The S7-400H is in the Redundant system
mode and an error access to the load
memory is executed.
Procedure
To change the load memory perform the following steps:
Step
1 Change the memory card on the
stopped CPU.
2 Perform a reset on the CPU with the
replaced memory card.
3 Start the CPU.
9-4
Failure
What Has To Be Done?
S7-400H Programmable Controller Fault-Tolerant Systems
How Does the System React?
Affected CPU switches to STOP and
makes a reset request.
Partner CPU switches to Solo mode.
How Does the System React?
-
-
CPU performs automatic LINK-UP
and UPDATE.
CPU changes to RUN and
operates as the standby CPU.
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