Failure of the redundant connection
Order of the reactions Reactions
Master server Standby server
Only for BATCH serv‐
er or for BATCH serv‐
er in combination with
Route Control server
The dialog "Restart request" appears
on the standby server.
For OS server or com‐
puters with a combi‐
nation of server func‐
tions
● BATCH server
● OS server
● Route Control
server
Process control message is output on the PCS 7 OS
only for Route Con‐
trol server
No reaction to the error.
Only for BATCH serv‐
er or for BATCH serv‐
er in combination with
Route Control server
No reaction
● 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.
Failure of software components (Health check)
Order of the reactions Reactions
Master server Standby server
OS server or BATCH
server or for BATCH
server in combination
with Route Control
server
The dialog "Restart request" appears
on the standby server.
A redundancy switchover then takes
place.
The dialog "Restart request" appears
on the standby server.
For OS server or com‐
puters with a combi‐
nation of server func‐
tions
● BATCH server
● OS server
● Route Control
server
● 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.
Failure, switchover and reintegration of high availability components
7.13 Redundancy behavior of the PCS 7 OS, SIMATIC BATCH and SIMATIC Route Control servers
High Availability Process Control Systems (V9.0)
Function Manual, 05/2017, A5E39221836-AA 241
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