Siemens SIMATIC PCS 7 Function Manual page 216

Failure, Switchover and Return of Fault-tolerant Components
6.10 Guidelines for updating a redundant OS in runtime
Phase 1 / 7. Server_2: Check and save the "Redundancy" dialog box
● Open the "Redundancy" editor and check the settings in the dialog box. Click "OK" to exit
the dialog box even if you have made no changes.
Phase 1 / 8. Server_2: Check and save the "Time Synchronization" dialog box
● Open the "Time Synchronization" editor and check the settings in the dialog box. Click "OK"
to exit the dialog box even if you have made no changes.
Phase 1 / 9. Client_2: Deactivate process mode and exit WinCC
● Deactivate the process mode on all clients where Server_2 is set up as preferred server.
Note
In WinCC Explorer (Server data), you can activate Server_1 for operation as preferred
server for Client_2 within the phases 1 and 2. This setting retains operability of the clients.
Phase 1 / 10. Server_2: Activate WinCC Runtime
● Activate WinCC Runtime on Server_2.
The system reacts as follows:
– There is no server failover. Depending on the configuration, the activated Server_2
– All OS clients still receive their visualization data from OS server Server_1, which has
Phase 1 / 11. Other redundant OS server pairs: Repeat steps 1 to 10
● If you are using more than one redundant OS server pair, you must first update standby
server Server_2 for each.
● Carry out the Phase 1 steps 1 through 10 for each Server_2.
Note
Migration of the central archive server (CAS) on the Process Historian
You can find more information about this in the "WinCC Classic Information System".
Result after Phase 1
● Server_2 is updated and not connected to any OS clients.
● Server_1 is the master server in the PCS 7 project being updated.
● Server_2 can be either master or standby, depending on the configuration.
● The archives will be synchronized between Server_1 and Server_2.
● Client_1 is connected to Server_1.
● Client_2 is either deactivated or interconnected with Server_1 after you have changed the
preferred server setting. Client_2 cannot access the upgraded Server_2 as the preferred
server.
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becomes the standby or master server.
not yet been updated.
Fault-tolerant Process Control Systems (V8.1)
Function Manual, 11/2014, A5E34878832-AA