Siemens SIMATIC S7-400H System Manual page 267

Step
6
7
Starting situation for replacement of the load memory
Failure
The S7-400H is in redundant system mode and a
load memory access error occurs.
Procedure
Follow the steps below to replace the load memory:
Step
1
2
3
S7-400H
System Manual, 03/2012, A5E00267695-11
16.2 Failure and replacement of components during operation
What has to be done?
Perform a CPU memory reset on the
replaced CPU.
Start the replaced CPU (for example, STOP-
RUN or Start using the PG).
What has to be done?
Replace the memory card on the stopped
CPU.
Perform a memory reset on the CPU with the
replaced memory card.
Start the CPU.
Failure and replacement of components during operation
How does the system react?
–
The CPU performs an automatic LINK-

UP and UPDATE.
The CPU changes to RUN and operates

as the reserve CPU.
How does the system react?
The relevant CPU changes to STOP and

requests a memory reset.
The partner CPU switches to single mode.

How does the system react?
–
–
The CPU performs an automatic LINK-

UP and UPDATE.
The CPU changes to RUN and operates

as the reserve CPU.
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