Siemens SIMATIC PCS 7 Function Manual page 218

Failure, Switchover and Return of Fault-tolerant Components
6.10 Guidelines for updating a redundant OS in runtime
Phase 2 / 2. Client_2: Installation of the operating system, PCS 7 Installation "OS client"
● Install or update the operating system (you can find information about this in the manual
Process Control System PCS 7; PCS 7 PC Configuration ).
An OS client runs only on an operating system that has been released for PCS 7. You can
find additional information on this in the
documentation.
● Install the necessary PCS 7 components.
In the PCS 7 Setup, select the "OS Client" check box in the "Program Packages" dialog
box.
● Make the necessary settings.
Note that Windows administration of PC stations 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
PC Configuration .
Phase 2 / 3. Client_2: 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 2 / 4. ES: Download to OS target system
● 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
downloads the project for Client_2 from the ES to the relevant OS.
Phase 2 / 5: Client_2: Activate
● Start WinCC on Client_2.
● Activate WinCC Runtime.
The system reacts as follows:
● Client_2 connects with the upgraded Server_2.
Result after Phase 2
● Server_1 is master server in the PCS 7 project.
● The updated Server_2 is standby server in the updated PCS 7 project.
● Client_1 is connected to Server_1.
● Updated Client_2 is connected to its preferred server Server_2.
● The system can be controlled from all OS clients.
Note
Maintenance client
If Server_2 is the maintenance server (last OS server pair to be updated in the project),
then the maintenance client (Client_2) can be started.
Maintenance client accesses to intelligent field devices are only possible after completion
of the software update.
218
Process Control System PCS 7; PCS 7 Readme
Process Control System PCS 7; PCS 7 PC Configuration .
Process Control System PCS 7; PCS 7
Fault-tolerant Process Control Systems (V8.1)
Function Manual, 11/2014, A5E34878832-AA