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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 Grafcet initial situation is characterized by steps

The execution time of a continuous action

A transition-condition…

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

The selection of sequence(s) is used when it is desired that the Grafcet evolves:

Several steps can be directly linked to a immediate succeeding transition through:

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

A macro-step is a representation of

What enables to perform the steps skip is