5.9.3 Physical model
Physical model with example – What do we use to produce?
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Process cell
A process cell contains all the equipment required to make a batch. Process cells are often
divided into trains. A train is made up of all units and other equipment that can be used by a
particular batch. Trains can be left unchanged from batch to batch or can be defined differently
for each batch.
Unit
A unit is made up of equipment modules and control modules. A unit is an independent
grouping of equipment usually centered around a major piece of processing equipment, such
as a mixing tank or reactor.
Characteristics of a unit:
● A unit can execute one or more major processing activities, such as react, crystallize and
make a solution.
● Units operate relatively independently of each other.
● A unit often contains a complete batch of material at some point in the processing sequence
of the batch.
● A unit cannot process more than one batch at the same time.
Technological basics complying with ISA-88.01
5.9 ANSI/ISA-88.01 models
SIMATIC BATCH V8.2
Operating Manual, 02/2016, A5E35958174-AA 115
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