cycle (in examples 1 and 2: 1000 ms; in examples 3 and 4: 100 ms) if the time set for the
"MaxCyclRun" parameter is exceeded in a processing cycle.
Note
We recommend that you install the UNIT_PLC block in OB32 (1000 ms watchdog interrupt).
Only if equipment phases are installed for example in OB35 does the UNIT_PLC belonging to
this EPH also need to be installed in OB35.
The UNIT_PLC should always be processed after
the equipment phases.
Installation in OB35 brings no benefits in terms of the speed with which the recipes are
processed because batch processing is handled by internal control mechanisms regardless
of the OB cycle.
Note
Temporal processes are shown in a schematic representation
To simplify the matter, the above examples show the temporal processes for one unit per AS.
However, there are normally several units active at the same time in an AS. To establish the
time required of an AS for batch processing, the average processing time ("QAVGTecProTime"
parameter) of all units must be added together.
Example 5: 6 UNIT_PLCs are processed at the same time in OB 32
MaxCyclRun is set to 50 ms
QAvgRecProTime = 20 to 40 ms per UNIT_PLC
Cycle time required per AS, maximum 240 ms In practice, an average AS load resulting from the 6 units in the
example is approximately 80 ms.
7.1.4.4 Self-terminating equipment phases
Definition
Self-terminating equipment phases are sequences that end with a process condition, in other
words, the end of the RUN sequence independently starts the COMPLETING sequence.
Engineering
7.1 Basic engineering for PCS 7
SIMATIC BATCH V8.2
148 Operating Manual, 02/2016, A5E35958174-AA
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