Siemens Simatic PCS 7 Function Manual page 238

Failure, switchover and reintegration of high availability components
7.12 Guide to updating a redundant Route Control server in runtime
Default Master
8. Start RC server (or WinCC Runtime) – starts as
standby (you may have to update the project)
9. New version – Runtime (standby)
: Default master or standby refers to the current state of the server pair before the software update in runtime. Any
(1)
redundancy switching is not necessary.
: V8.x. means Route Control V8.2.
(2)
Additional information
● Programming and Operating Manual
Route Control; section "Software update."
238
(1)
Default Standby
(1)
New version – Runtime
The database is read.
New version – Runtime
SIMATIC Process Control System PCS 7; SIMATIC
High Availability Process Control Systems (V9.0)
Function Manual, 05/2017, A5E39221836-AA