Siemens SIMATIC HMI Series System Manual page 151

Initial Situation
● Server1 is the master server.
(Server1 stands for all master servers in a redundant server pair.)
● Server2 is the standby server.
(Server2 stands for all standby servers in a redundant server pair.)
● WinCC Client1 is connected to Server1.
(WinCC Client1 stands for all WinCC clients originally connected to Server1, which should
be reconnected with Server1 after the migration.)
● WinCC Client2 is connected to Server2 because it is configured for it as the preferred
server.
(WinCC Client2 stands for all WinCC clients originally connected to Server2, which should
be reconnected with Server2 after the migration.)
Procedure - Quick Reference
Note
In order not to interrupt operation of the system, observe the sequence of steps described.
The working steps from Phase 1 to Phase 4 must be completed without any longer interruptions.
Note
Create a backup of the entire system before upgrading the server.
Configure a preferred server for all clients to be upgraded.
Phase 1: Upgrading the Standby Server
1. WinCC Client1: Configure Server1 as preferred server
2. WinCC Client2: Configure Server1 as preferred server
3. Server2: Deactivate
4. Server2: Exit WinCC
5. Server2: Reboot the computer
6. Server2: Install new WinCC version
7. Server2: Migrate project
8. Server2: Activate
9. Server2: Other redundant server pairs: Execute Steps 1 to 8
Phase 2: Upgrade WinCC clients
10. WinCC Client2: Deactivate and exit WinCC
11. WinCC Client2: Reboot the computer
12. WinCC Client2: Install new WinCC version
13. WinCC Client2: Migrate project
WinCC: General information and installation
System Manual, 02/2017, A5E40840020-AA
5.9 Upgrading a Redundant System in Normal Operation
Migration
151