Siemens SIMATIC PCS 7 System Manual page 163

Tab
Watchdog interrupt (for each watchdog
interrupt OB)
Diagnostics/clock
Security
H parameter
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 Switch to CPU with modified configuration
5 Transition to redundant system mode
Note
After changing the hardware configuration, download takes place practically automatically.
You then no longer have to perform the steps described in sections Step 2: Stopping the
reserve CPU (Page 164) to Step 5: Transition to redundant system mode (Page 166). 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".
CPU 410-5H Process Automation/CPU 410 SMART
System Manual, 09/2014, A5E32631667-AB
Editable parameter
Execution
Phase offset
Correction factor
Security level and password
Test cycle time
Maximum cycle time extension
Maximum communication delay
Maximum inhibit time for priority classes > 15
Minimum I/O retention time
System modifications during redundant operation
10.5 Editing CPU parameters
See section
Step 1: Editing CPU parameters offline
(Page 164)
Step 2: Stopping the reserve CPU (Page 164)
Step 3: Downloading a new hardware configura-
tion to the reserve CPU (Page 165)
Step 4: Switching to CPU with modified configura-
tion (Page 165)
Step 5: Transition to redundant system mode
(Page 166)
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