Step 7, Step 4: Stopping The Standby Cpu; Step 7, Step 5: Loading New Hardware Configuration In The Standby Cpu - Siemens SIMATIC S7-400H System Manual

System modifications in operation
14.5 Adding components in STEP 7
14.5.4

STEP 7, step 4: 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. OB 70 (I/O redundancy loss) is not called due to the higher-priority CPU
redundancy loss (OB 72).
14.5.5

STEP 7, step 5: 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.
222
Operating Mode" from the menu.
System Manual, 09/2007, A5E00267695-03
S7-400H