Siemens SIMATIC S7-400H - Changing the Memory Components of the CPU

Failure and replacement of components during operation
16.2 Failure and replacement of components during operation
S7-400H
System Manual, 03/2012, A5E00267695-11
267
Step What has to be done? How does the system react?
6 Perform a CPU memory reset on the
replaced CPU.
–
7 Start the replaced CPU (for example, STOP-
RUN or Start using the PG).
 The CPU performs an automatic LINK-
UP and UPDATE.
 The CPU changes to RUN and operates
as the reserve CPU.
Starting situation for replacement of the load memory
Failure How does the system react?
The S7-400H is in redundant system mode and a
load memory access error occurs.
 The relevant CPU changes to STOP and
requests a memory reset.
 The partner CPU switches to single mode.
Procedure
Follow the steps below to replace the load memory:
Step What has to be done? How does the system react?
1 Replace the memory card on the stopped
CPU.
–
2 Perform a memory reset on the CPU with the
replaced memory card.
–
3 Start the CPU.
 The CPU performs an automatic LINK-
UP and UPDATE.
 The CPU changes to RUN and operates
as the reserve CPU.