Appendix A Glossary
126
subarbitration
The process of arbitrating the use of a dedicated resource required by
phases operating in parallel within a control recipe.
tag
A named area of the process-connected device or controller’s memory
where data is stored. It is the basic mechanism for allocating memory,
referencing data from logic, and monitoring data.
terminal (final) step
The logical end of an SFC.
transition
Defines how recipe control moves from step to step. When a step is
complete, the transition designates the criteria that must be met
before the recipe continues to its next logical step.
unacknowledged prompt parameter
A step parameter directed to prompt the operator for data when a
phase requests a download.
unit
A collection of associated control modules and/or equipment modules
that can carry out one or more major processing activities such as
react, crystallize, make a solution, etc.
unit-based recipe
A recipe that specifies a specific unit for equipment requirements.
unit class
A means of categorizing units into groups of similar or identical sets of
equipment. Recipes can be written specifying a unit class (class-based),
or a specific unit (unit-based).
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