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

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

A transition-condition…

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

A step can be connected to several transitions immediate succeeding by using a:

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

Two steps can be directly connected.

How many transitions can a pit step have immediate preceding?

A Grafcet initial situation is characterized by steps

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