Integration Architecture for the Automation of a Production Complex is a reference architecture based on holonics manufacturing systems that it divides the processes in production units. Each production unit represents a part of the process (and its control) with autonomy and capacity to negotiate with the other production units. This work presents a method to model and to implement supervisors of discrete events in the production unit. The supervisor is modeled with a Petri net to which is added an interface to be able to read the events and to execute the actions of the process. The method allows to simulate, to prove and to modify the supervisor easily this makes that the production unit is flexible to the changes in the product or in the process.