Order of the reactions Reactions
Failure at the master server (Serv‐
er_a)
Failure at the standby server (Serv‐
er_b)
For OS server or com‐
puters with a combina‐
tion of server functions
● BATCH server
● OS server
● Route Control
server
Process control message is output on the PCS 7 OS
Only for BATCH server
or for BATCH server in
combination with Route
Control server
If automatic restart is activated, it is executed on the server affected by the
failure.
The server is in "Standby" mode following restart.
Plant bus failure
● PCS 7 OS server:
So that the failure of the plant bus is recognized, the option "WinCC client switch in case
of a process connection error" has to be selected.
(Default setting: the option is selected)
● SIMATIC BATCH:
Failure of the plant bus is only relevant for SIMATIC BATCH if the batches are executed in
the automation system.
Order of the reactions Reactions
Failure at the master server (Serv‐
er_a)
Failure at the standby server (Serv‐
er_b)
Only for BATCH serv‐
er or for BATCH serv‐
er in combination with
Route Control server
Standby server (Server_b) becomes
master;
Computer (server a) becomes stand‐
by
No redundancy switchover master re‐
mains master
only for Route Control
server
Standby server (Server_b) becomes
master
No redundancy switchover master re‐
mains master
Computer switches to initialization or error status.
The computer becomes standby following reconnection to the plant bus.
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.
No isolation of the network adapter.
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)
240 Function Manual, 05/2017, A5E39221836-AA
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