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A transition to be enabled has to have all the immediate preceding steps active

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

A source transition does not have any immediate preceding step.

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

The steps skip is a particular case of …

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 macro-step is a representation of

A pit transition can have one or more steps immediate preceding.

The fundamental elements which constitute Grafcet are: