Siemens Simatic PCS 7 Function Manual page 234

Failure, switchover and reintegration of high availability components
7.10 Guide to updating a redundant OS in runtime
Note that Windows administration of PCs should be performed by a Windows administrator.
You can find a detailed description of the PCS 7 installation and the required PCS 7-specific
settings for PC stations in the manual
Configuration .
Phase 5 / 5. Server_1: If you want to use encrypted communication after the software update:
Activate "Encrypted communication" with migration mode. You can find information about this
in the documentation
Phase 5 / 6. ES: Download OS connection data and OS target system
● Open NetPro and download the connection data from the ES to Server_1.
● Right-click on the OS to be transferred in the open PCS 7 project below the WinCC
application. Select the menu command PLC > Download in the shortcut menu. This starts
the transfer from the ES to Server_1.
Phase 5 / 7. Server_1: Start WinCC
● Start WinCC on Server_1.
Phase 5 / 8. Server_1: 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 5 / 9. 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"
to exit the dialog box even if you have made no changes.
Phase 5 / 10. Server_1: Activate WinCC Runtime
● Activate WinCC Runtime on Server_1.
Note
If a Process Historian is used in the project make sure:
● The Process Historian was updated before
● The Process Historian is in the "Active" state.
● "PH-Ready Configuration" was done after update-/new- installation at Server_1.
Phase 5 / 11. Perform Phase 5: Steps 1 to 10
If you are using more than one redundant OS server pair, repeat steps of Phase 5 / step 1
through 10 for each Server_1.
Phase 5 / 12. ES: Starting SIMATIC PDM
Start the SIMATIC PDM on the ES, if installed.
The system reacts as follows:
● Server_1 becomes standby server.
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Process Control System PCS 7; PCS 7 PC
Process Control System PCS 7; PCS 7 PC Configuration .
High Availability Process Control Systems (V9.0)
Function Manual, 05/2017, A5E39221836-AA