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

The OR divergence is represented by an horizontal line with one immediate preceding connection and

A transition-condition is

What enables to perform the steps skip is

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.

The execution time of a continuous action

Two steps can be directly connected.

Situation, is the Grafcet term used to designate a set of

A pit step has only a transition immediate preceding.

Variable Xi represents a Boolean variable such that