Step C: Loading New Hardware Configuration In The Standby Cpu - Siemens SIMATIC S7-400H Manual

Modifications to the System while in Operation
Procedure
1. In SIMATIC Manager select a CPU of the fault-tolerant system and select the
menu command PLC > Operating Mode.
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 Solo mode. One-way I/O of the standby
CPU are no longer addressed.
10.6.3 Step C: Loading new Hardware Configuration in the Standby
CPU
Initial situation
The fault-tolerant system is working in Solo mode.
Procedure
Load the compiled hardware configuration in the standby CPU that is in STOP
mode.
Note
The user program and the connection configuration must not be overloaded in
Solo mode.
Result
The modified CPU parameters in the new hardware configuration of the standby
CPU do not yet have an effect on ongoing operation.
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S7-400H Programmable Controller Fault-Tolerant Systems
A5E00068197-04