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A source step does not have any preceding transition. In the case in which it is not an initial step it can be activated by a forcing order or by enclosure.
A pit step does not have any succeeding transition. To deactivate a pit step it is necessary a forcing order (from a higher order Grafcet) or deactivate the enclosing step, in the case of the pit step being enslosed.
A source transition does not have any preceding step. The transition is always validated. Generally an edge receptivity is used to avoid successive transition clearances.
A pit transition does not have any succeeding step. The firing of this transition has the goal of deactivate immediately preceding steps. In in the same way as the source transition, it is advisable to use edges receptivities in this type of transition.