Batch Server; Failure Of Batch Servers - Siemens Simatic PCS 7 Function Manual

Failure, switchover and reintegration of high availability components

7.5 BATCH server

7.5 BATCH server
7.5.1

Failure of BATCH servers

Functionality
BATCH applications and any configured WinCC applications are active on BATCH servers. A
BATCH client visualizes the batch data of the BATCH server to which it is connected.
Failure of the master BATCH server
If the master BATCH server fails, for example, due to an operating system failure or an
application error, the standby BATCH server detects that the master is no longer available
based on redundancy mechanisms and takes over the master role. The BATCH clients are
then automatically switched over from the master BATCH server to the standby BATCH server.
The running BATCH program is automatically resumed after the switchover to the redundant
BATCH server. The BATCH program status is synchronized between the active BATCH server
and the AS. You have to manually trigger the BATCH program to continue if communication
errors have occurred.
In a replication solution, the databases on the master BATCH server and the standby BATCH
server are continually synchronized. If the BATCH servers switch over, the new active BATCH
server always has access to the latest BATCH data.
Note
Data reliability
During the switchover from the failed BATCH server to its redundant BATCH server, no
automation process data are visualized on a BATCH client. Operator inputs are also lost during
this brief period.
PC station identified as faulty
You can find information on this in the section "Failure, switchover and restarting redundant
OS servers (Page 205)".
Additional information
● Manual
210
Process Control System PCS 7; SIMATIC BATCH
High Availability Process Control Systems (V9.0)
Function Manual, 05/2017, A5E39221836-AA