Representational Power Of A Petri Nets

Typical manufacturing system's characteristics are as given:

(a) Concurrency,

(b) Decision making,

(c) Synchronization, and

(d) Priorities.

These can be easily modelled employing the graphical top to down approach of Petri net. At this time consider the diagrams shown in following figures (a) to (h).

Definition 8: Sequential Execution

In a Petri net the top to down approach is followed that is named as also as the sequential execution.

                                       Figure a: Sequential Execution of the Petri Net

The above Figure (a) represents the sequential execution power of the Petri net. Obviously from the above figure, transition t₂ cannot be fired before transition t₁.