Modelling of Logistic System by Petri Nets

Preliminary note In this paper an application of Petri nets (Petri Nets – PN) is shown in the modeling and simulation of the production process. Petri nets are graphically mathematical tools that are suitable for modeling and projecting different system types. The very approach to a system modeling by means of Petri nets faithfully reflects the way events develop in the real world so that, for Petri nets, it can be said that they have almost universal application. Computer (PC) simulation is possible by means of the application of the extended Petri nets both in model building and in designing the simulation program routine. The program firstly checks the execution of preconditions for one of the cycles to take place. This routine is cyclical and each cycle corresponds to one time unit. After initiating any cycle, the state space does not allow allocation of a new assignment on this entity until the time interval anticipated for the cycle duration that is in progress has passed.