System modifications during operation
17.7 Editing CPU parameters
S7-400H
System Manual, 03/2012, A5E00267695-11
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17.7.2 Step 1: Editing CPU parameters offline
Starting situation
The fault-tolerant system is operating in redundant system 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 target system just yet.
Result
The modified hardware configuration is in the PG/ES. The target system continues operation
with the old configuration in redundant system mode.
17.7.3 Step 2: Stopping the reserve CPU
Starting situation
The fault-tolerant system is operating in redundant system mode.
Procedure
1. In SIMATIC Manager, select a CPU of the fault-tolerant system, then choose "PLC >
Operating Mode" from the menu.
2. In the "Operating Mode" dialog box, select the reserve CPU, then click "Stop".
Result
The reserve CPU switches to STOP mode, the master CPU remains in RUN mode, the fault-
tolerant system works in single mode. The one-sided I/O of the reserve CPU is no longer
addressed.
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