Batch Server; Reaction Of Batch Servers To Failure - Siemens SIMATIC PCS 7 Function Manual

6.5

BATCH Server

6.5.1

Reaction of BATCH servers to failure

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 failover 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 failover 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
Additional information on this is available in the section "Failure, failover and restarting of
redundant OS servers (Page 196)".
Additional information
● Manual
Fault-tolerant Process Control Systems (V8.1)
Function Manual, 11/2014, A5E34878832-AA
Failure, Switchover and Return of Fault-tolerant Components
Process Control System PCS 7; SIMATIC BATCH
6.5 BATCH Server
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