Failure and Replacement of Components During Operation
10-4
Automation System S7-400H Fault-tolerant Systems
A5E00068197-07
Step How Does the System React?What Has To Be Done?
5 Switch the power supply module on
again.
• CPU executes the self-tests and
goes to STOP.
6 Perform Memory Reset on the replaced
CPU.
-
7 Start the replaced CPU (e.g.
STOP³RUN or Start via programming
device).
• CPU performs automatic LINK-UP
and UPDATE.
• CPU changes to RUN and
operates as the standby CPU.
Starting situation for replacement of the load memory
Failure How Does the System React?
The S7-400H is in redundant system mode
and an error access to the load memory
is executed.
• Affected CPU switches to STOP and
makes a reset request.
• Partner CPU switches to single mode.
Procedure
To change the load memory, perform the following steps:
Step What Has To Be Done? How Does the System React?
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. • CPU performs automatic LINK-UP
and UPDATE.
• CPU changes to RUN and
operates as the standby CPU.
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