Siemens SIMATIC S7-400H Manual page 176

Modifications to the System while in Operation
Step What Has To Be Done?
6 Modify the memory components of the
second CPU as you did for the first CPU in
step 2.
7 Load the user program and the hardware
configuration into the second CPU.
8 Start the second CPU using the PG.
Note
If you want to change to FLASH cards you can load these outside the CPU with
the user program and hardware configuration. You can then omit steps 4 and 7.
However, the memory cards in the two CPUs must be loaded using the same
procedure. Changing the order of the blocks in the load memories will result in
cancellation of the link-up.
10-50
How Does the System React?
Second CPU links up and is updated.
System works the Redundant system
mode again.
S7-400H Programmable Controller Fault-Tolerant Systems
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