Step 3: Stop The Standby Cpu; Step 4: Download New Hardware Configuration To The Standby Cpu - Siemens SIMATIC PCS 7 CPU 410-5H System Manual

10.4.3

Step 3: Stop the standby CPU

Starting situation
The fault-tolerant system is operating in redundant system mode. The user program will no
longer attempt to access the hardware being removed.
Procedure
1. For CPU access protection with password: In SIMATIC Manager, select a CPU of the
fault-tolerant system, then select
"PLC > Access Rights > Setup" from the menu. Enter the CPU access password.
2. In SIMATIC Manager, select a CPU of the fault-tolerant system, then select "PLC >
Operating Mode" from the menu.
3. In the "Operating Mode" dialog box, select the standby CPU and 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. The one-sided I/O of the standby CPU is no
longer addressed.
10.4.4

Step 4: Download new hardware configuration to the standby CPU

Starting situation
The fault-tolerant system is operating in single mode.
Procedure
Load the compiled hardware configuration in the reserve CPU that is in STOP mode.
Note
The user program and connection configuration cannot be downloaded in single mode.
Result
The new hardware configuration of the reserve CPU does not yet have an effect on ongoing
operation.
CPU 410-5H Process Automation
System Manual, 09/2014, A5E31622160-AB
System modifications during redundant operation
10.4 Removal of components
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