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

11.6.1

Step A: Changing the CPU Parameters Offline

Initial situation
The fault-tolerant system is working in redundant system mode.
Procedure
1. Change the desired properties of the CPU offline in the hardware configuration.
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 to work
with the old configuration in redundant system mode.
11.6.2

Step B: Stopping the Standby CPU

Initial situation
The fault-tolerant system is working in redundant system mode.
Procedure
1. In SIMATIC Manager, select a CPU of the fault-tolerant system, and choose the
PLC > Operating Mode menu command.
2. In the Operating Mode dialog box, select the standby CPU and click the Stop
button.
Result
The standby CPU switches to STOP mode, the master CPU remains in RUN
mode, the fault-tolerant system works in single mode. One-way I/O of the standby
CPU are no longer addressed.
Automation System S7-400H Fault-tolerant Systems
A5E00068197-07
Modifying the System During Operation
11-43