Siemens SIMATIC S7-400H System Manual page 324

System modifications during operation
17.7 Editing CPU parameters
The selected new values should match both the currently loaded and the planned new user
program.
Starting situation
The fault-tolerant system is operating in redundant system mode.
Procedure
To edit the CPU parameters of a fault-tolerant system, follow the steps outlined below.
Details of each step are described in a subsection.
Step What to do?
1 Editing CPU parameters offline
2 Stopping the reserve CPU
3 Downloading modified CPU parameters to the reserve
CPU
4 Switching to CPU with modified configuration
5 Transition to redundant system mode
Note
After changing the hardware configuration, download takes place practically automatically.
This means that you no longer need to perform the steps described in sections Step 2:
Stopping the reserve CPU (Page 325) to Step 5: Transition to redundant system mode
(Page 328). The system behavior remains as described.
You will find more information in the HW Config online help "Download to module ->
Download station configuration in RUN mode". You will find more information in the
HW Config online help "Download to module -> Download station configuration in RUN
mode".
324
See section
Step 1: Editing CPU parameters offline
(Page 325)
Step 2: Stopping the reserve CPU (Page 325)
Step 3: Downloading a new hardware
configuration to the reserve CPU (Page 326)
Step 4: Switching to CPU with modified
configuration (Page 326)
Step 5: Transition to redundant system mode
(Page 328)
System Manual, 03/2012, A5E00267695-11
S7-400H