  New subclasses of Petri nets - Petri nets receptors and Petri nets effectors
are introduced. The introduction/exclusion of such substructures in the main
Petri net may be fulfilled in accordance with the Fusion/Defusion principles.
We propose two pairs of entities: position marking receptor (effector) and
transition marking receptor (effector), which allow to observe parameters of
the main Petri net and, if necessary, to carry out their regulation.
