Step 7, Step 4: Downloading A New Hardware Configuration To The Reserve Cpu - Siemens SIMATIC S7-400H System Manual

System modifications during operation
17.6 Removing components in STEP 7
17.6.4

STEP 7, step 4: Downloading a new hardware configuration to the reserve CPU

Starting situation
The fault-tolerant system is operating in single mode.
Procedure
Load the compiled hardware configuration in the reserve CPU that is in STOP mode.
NOTICE
The user program and connection configuration cannot be downloaded in single mode.
Result
The new hardware configuration of the reserve CPU does not yet have an effect on ongoing
operation.
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System Manual, 03/2012, A5E00267695-11
S7-400H