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The fundamental elements which constitute Grafcet are:

Two steps can be directly connected.

A source transition does not have any immediate preceding step.

GRAFCET abbreviation derives from

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

By Grafcet evolution rule number 4 several transitions which can be simultaneously cleared…

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 transition is enabled if one its preceding steps is active.

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.