Pcs7, Step Iii: Stopping The Standby Cpu - Siemens SIMATIC S7-400H Manual

10.3.3

PCS7, Step III: Stopping the Standby CPU

Initial situation
The fault-tolerant system is working in the Redundant system mode. The user
program will no longer attempt to access the hardware to be removed.
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.
10.3.4 PCS7, Step IV: 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 new hardware configuration of the standby CPU does not yet have an effect
on current operation.
S7-400H Programmable Controller Fault-Tolerant Systems
A5E00068197-04
Modifications to the System while in Operation
10-19