Siemens SIMATIC PCS 7 Function Manual page 206

Failure, Switchover and Return of Fault-tolerant Components
6.10 Guidelines for updating a redundant OS in runtime
● Open the "Redundancy" editor and check the settings in the dialog box. Click "OK" to exit
Phase 5 / 8. Server_1: Check and save the "Time Synchronization" dialog box
● Open the "Time Synchronization" editor and check the settings in the dialog box. Click "OK"
Phase 5 / 9. Server_1: Activate WinCC Runtime
● Activate WinCC Runtime on Server_1.
Phase 5 / 10. Carry out Phase 5: Steps 1 to 9
If you are using more than one redundant OS server pair, repeat steps of Phase 5 / step 1
through 19 for each Server_1.
Phase 5 / 11. ES: Starting SIMATIC PDM
Start the SIMATIC PDM on the ES, if installed.
The system reacts as follows:
● Server_1 becomes standby server.
Result after Phase 5
● Updated Server_1 is standby server.
● Updated Server_2 is master server.
● Updated Client_1 is connected to its preferred server Server_1.
● Updated Client_2 is connected to its preferred server Server_2.
The updating of your redundant operator stations is complete.
Maintenance client accesses to intelligent field devices are possible when the PDM server has
been started on the engineering station.
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the dialog box even if you have made no changes.
to exit the dialog box even if you have made no changes.
Fault-tolerant Process Control Systems (V8.0)
Function Manual, 03/2012, A5E02779471-02