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A transition-condition (receptivity) is every logical function associated to each

Step

Transition

Action

Structure

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

three connections immediate succeeding

one connection immediate succeeding

two connections immediate succeeding

two or more connections immediate succeeding

A macro-step is a representation of

a set of steps

the Grafcet state

all the logical conditions associated with the transitions

a succeeding steps and transitions

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

True

False

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.

True

False

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

True

False

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

True

False

A Grafcet initial situation is characterized by steps

Active at the final time

Deactivate at the initial time

Active at the initial time

Deactivate at the final time

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

AND-junction

structural parallelism

sequence selection

AND-convergence

The timed variables can be associated to…

steps or transitions

actions or transitions

transitions

steps

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