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GRAFCET charts have been standardised outside of France as
Sequential Function Charts (IEC848). THey are often used to describe
the mandated behaviour of sequential automates. They are in fact an
offspring of Petri nets but oriented towards specification of actions
and mandated evolutions rather than simple descriptions of state and
possible evolutions.
The supplied shapes of the GRAFCET sheet include a Regular
Step, Initial Step, Macro Entry Step, Macro Exit Step, Macro Call
Step, Macro Sub-Program Call Step. These are essentially variations
of the same shape and one can be changed to
another by editing the object properties. Next are an Action,
Condition, Transition, OR Vergent, AND Vergent, and an Arc. The
first nine shapes have object defaults for setting the font, font size
and pen colour. The Arc can have arrow heads.
Copyright © 1995-2006 [email protected]
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