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The steps skip is a particular case of …

GRAFCET abbreviation derives from

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

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

A predicate is a logical expression with one or more variables.

How many rules define the GRAFCET evolution?

A Grafcet initial situation is characterized by steps

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

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

How many transitions can a pit step have immediate preceding?