Step A: Editing Cpu Parameters Offline - Siemens SIMATIC S7-400H System Manual

Starting situation
The fault-tolerant system is operating in redundant mode.
Procedure
To edit the CPU parameters of a fault-tolerant system, follow the steps outlined below.
Details of each step are listed in a subsection.
Step
A
B
C
D
E
Note
After changing the hardware configuration, it is downloaded practically automatically. This
means that you no longer need to perform the steps described in sections Step B: Stopping
the standby CPU (Page 236) to Step E: Transition to redundant state (Page 238). The
system behavior remains unchanged as already 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".
14.7.2

Step A: Editing CPU parameters offline

Starting situation
The fault-tolerant system is operating in redundant mode.
Procedure
1. Edit the relevant CPU properties offline in HW Config.
2. Compile the new hardware configuration, but do not load it into the PLC just yet.
Result
The modified hardware configuration is in the PG/ES. The PLC continues operation with the
old configuration in redundant mode.
S7-400H
System Manual, 09/2007, A5E00267695-03
What has to be done?
Editing CPU parameters offline
Stopping the standby CPU
Downloading modified CPU parameters to the standby CPU
Switch to CPU with altered configuration
Change to redundant mode
System modifications in operation
14.7 Editing CPU parameters
See section
Step A: Editing CPU
parameters offline
(Page 235)
Step B: Stopping the
standby CPU (Page 236)
Step C: Loading new
hardware configuration in
the standby CPU
(Page 236)
Step D: Switch to CPU
with modified
configuration (Page 237)
Step E: Transition to
redundant state
(Page 238)
235