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5.7 What is a formula category?
Definition
A formula category is a grouping of recipe formulas associated with a single master procedure
each having the same attributes. The only differences between the formulas of a formula
category are the concrete parameter values.
The formula category is a therefore a "template"/a "type" for different material and production
data records.
The formula category contains the parameters that can be manipulated by the operator via a
formula during batch planning. These parameters are included in the formula category with
their data type and unit of measure.
Note
Formula categories can be defined independently of the recipe.
Purpose
Working with formula categories makes it much easier to maintain master recipes based on
the same recipe procedures. Modifications only need to be made at one point (of a recipe
procedure) and not in all recipe procedures.
ISA-88 does not mention the formula category. However, the formula category does not
contradict the formula definition in ISA-88, instead it expands it (see also "Models of the ISA-88
Standard").
Technological basics complying with ISA-88.01
5.7 What is a formula category?
SIMATIC BATCH V8.2
Operating Manual, 02/2016, A5E35958174-AA 111
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