Siemens SIMATIC BATCH Operating Manual page 52

Product introduction and installation
3.5 Possible configurations
AS-based mode: Interaction with the automation system
In contrast to the PC-based mode, a BATCH server in the AS-based mode requires a network
connection to both the terminal and plant bus. This ensures direct communication between
the BATCH server and the AS via a separate communication channel. Via this channel, the
control recipes on the automation system are accessed while the runtime system is operating.
To accelerate a step change, for example, switch to next signals are set in the control recipe
and therefore in the automation system.
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SIMATIC BATCH V8.2
Operating Manual, 02/2016, A5E35958174-AA