System modifications during operation
17.8 Changing the CPU memory configuration
S7-400H
330 System Manual, 03/2012, A5E00267695-11
Procedure
Proceed as follows in the specified sequence:
Step What to do? How does the system react?
1 Switch the reserve CPU to STOP using the
programming device.
The system is now operating in single mode.
2 Replace the memory card in the CPU with a card
which has the required (higher) capacity.
Reserve CPU requests memory reset.
3 Reset the reserve CPU using the programming
device.
–
4 Start the reserve CPU with the menu command "PLC
> Mode > Switch to CPU ... with expanded memory
configuration".
The reserve CPU links up, is updated and
becomes the master.
Previous master CPU changes to STOP.
System operates in single mode.
5 Turn off power to the second CPU. The subsystem is disabled.
6 Modify the memory configuration of the second CPU
as you did in steps 2 to 3 for the first CPU.
–
7 Start the second CPU with the menu command "PLC
> Mode > Switch to CPU ... with expanded memory
configuration".
The second CPU is linked up and updated.
The system is now operating again in redundant
system mode.
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