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A predicate is a logical expression with one or more variables.

When a transition is enabled and the associated condition is true, the transition is not cleared.

A source transition does not have any immediate preceding step.

Grafcet evolution rule number 5 states that, when a step is simultaneously activated and deactivated it remains active!

The fundamental elements which constitute Grafcet are:

The timed variables can be associated to…

In Gracet when an action D is defined as D:=1, it means that that action stops being executed when the associated step is deactivated.

A transition is enabled if one its preceding steps is active.

Variable Xi represents a Boolean variable such that

A Grafcet initial situation is characterized by steps