Siemens SIMATIC PCS 7 Function Manual page 211

Fault-tolerant process control systems (v8.1)
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Initial situation
● Server_1 is master server.
● Server_2 is standby server.
● Client_1 is connected to Server_1 because this server is configured as its preferred server.
Client_1 represents all OS clients connected to Server_1.
● Client_2 is connected to Server_2 because this server is configured as its preferred server.
Client_2 represents all OS clients connected to Server_2.
Requirements
● Process Mode of the Maintenance Client was ended before the ES was updated.
● The update of the PCS 7 project for the ES is complete.
● If the Maintenance Station is used, SIMATIC PDM is installed on the ES.
● All the settings for the configured mode have been made. The configuration data has been
loaded onto the ES from NetPro.
● If you want to use encrypted communication after the software update: "Encrypted
communication" is activated for the ES with migration mode. You can find information about
this in the documentation
● All OS servers and all OS clients are running with PCS 7 V7.1.3. or higher.
Overview of the required tasks
NOTICE
Interrupted redundancy
Perform the steps described from Phase 1 to Phase 5 without extended interruptions because
the redundancy is not available during the update.
Fault-tolerant Process Control Systems (V8.1)
Function Manual, 11/2014, A5E34878832-AA
Failure, Switchover and Return of Fault-tolerant Components
6.10 Guidelines for updating a redundant OS in runtime
Process Control System PCS 7; PCS 7 PC Configuration .
211

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