Step 7, Step Iii: Stopping The Standby Cpu; Step 7, Step Iv: Loading New Hardware Configuration In The Standby Cpu - Siemens SIMATIC S7-400H System Manual

14.6.3

STEP 7, step III: Stopping the standby CPU

Starting situation
The fault-tolerant system is operating in redundant mode. The user program will no longer
attempt to access the hardware being removed.
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.
14.6.4

STEP 7, step IV: Loading new hardware configuration in the standby CPU

Starting situation
The fault-tolerant system is operating in single mode.
Procedure
Load the compiled hardware configuration in the standby CPU that is in STOP mode.
NOTICE
The user program and connection configuration can not be downloaded in single mode.
Result
The new hardware configuration of the standby CPU does not yet have an effect on ongoing
operation.
S7-400H
System Manual, 09/2007, A5E00267695-03
Operating Mode" from the menu.
System modifications in operation
14.6 Removing components in STEP 7
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