Step A: Editing Parameters Offline; Step B: Stopping The Standby Cpu - Siemens SIMATIC S7-400H System Manual

System modifications in operation
14.9 Reconfiguration of a module
14.9.2

Step A: Editing parameters offline

Starting situation
The fault-tolerant system is operating in redundant mode.
Procedure
1. Edit the module parameters 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.
14.9.3

Step B: Stopping the standby CPU

Starting situation
The fault-tolerant system is operating in redundant mode.
Procedure
1. In SIMATIC Manager, select a CPU of the fault-tolerant system, then choose "PLC >
2. From the "Operating Mode" dialog box, select the standby CPU, then click "Stop".
Result
The standby CPU switches to STOP mode, the master CPU remains in RUN mode, the
fault-tolerant system works in single mode. One-sided I/O of the standby CPU is no longer
addressed.
244
Operating Mode" from the menu.
System Manual, 09/2007, A5E00267695-03
S7-400H