Siemens SIMATIC BATCH Operating Manual page 383

"time-driven" is set, the batches are started according to the set time. Once the time has
elapsed, the batch whose start time is furthest in the past is started first.
Example scenario
● If a "Start allocation" for unit A was selected, the batch starts only when it can occupy unit
A. If the unit is allocated to another batch, the batch does not change to the "in progress"
or "waiting" status.
● There is another reaction if "Start allocation" is not selected: The batch then changes to the
"waiting" status. In other words, the batch runs and waits until unit A is released.
Chaining batches
If you want the batches to be processed in a specific order (regardless of the order in which
they were released), you can also chain batches. For each planned batch, you can specify
which batch must be started and which batch must be completed before the planned batch is
started.
Additional information:
Chaining of batches (Page 359)
SIMATIC BATCH V8.2
Operating Manual, 02/2016, A5E35958174-AA
BATCH Control Center
9.8 Batch control
383