Siemens SIMATIC PCS 7 - Page 21

Installing updates and service packs
3.3 Checking plant status
Compendium Part D - Operation and Maintenance (V9.0)
Operating Manual, 02/2018, A5E43228948-AA
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Procedure
1. Open the WinCC Explorer on the OS client.
2. Open the "Server Data" shortcut menu.
3. Select the menu command "Configure".
4. Select one of the redundant OS server computers as the preferred server.