Siemens Simatic PCS 7 Function Manual page 241

7.13 Redundancy behavior of the PCS 7 OS, SIMATIC BATCH and SIMATIC Route Control servers
Failure of the redundant connection
Order of the reactions
Only for BATCH serv‐
er or for BATCH serv‐
er in combination with
Route Control server
For OS server or com‐
puters with a combi‐
nation of server func‐
tions
● BATCH server
● OS server
● Route Control
only for Route Con‐
trol server
Only for BATCH serv‐
er or for BATCH serv‐
er in combination with
Route Control server
Failure of software components (Health check)
Order of the reactions
OS server or BATCH
server or for BATCH
server in combination
with Route Control
server
For OS server or com‐
puters with a combi‐
nation of server func‐
tions
● BATCH server
● OS server
● Route Control
High Availability Process Control Systems (V9.0)
Function Manual, 05/2017, A5E39221836-AA
Failure, switchover and reintegration of high availability components
Master server
server
Master server
The dialog "Restart request" appears
on the standby server.
A redundancy switchover then takes
place.
● Process control message is output on the PCS 7 OS
● Network adapter for terminal bus and redundant link are deactivated.
● If automatic restart is activated, it is executed on the server affected by the
failure.
The server is in "Standby" mode following restart.
server
Reactions
Process control message is output on the PCS 7 OS
No reaction to the error.
No reaction
Reactions
Standby server
The dialog "Restart request" appears
on the standby server.
● Network adapter for terminal bus
and redundant link are deactivated.
● If automatic restart is activated, it is
executed on the server affected by
the failure.
The server is in "Standby" mode
following restart.
Standby server
The dialog "Restart request" appears
on the standby server.
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