Construção e sintetização de modelos de estado para o controle de processos

Abstract

The present master thesis has as its main goal to develop a methodology able to assist in design and implementation of discrete event system (DES) controllers in order to optimize the modeling, documentation and deployment of plant in study. To do so the automaton traditional concept was changed to include a new subset of mandatory states, i.e. states that the system should pass before reach a marked state. Following the traditional modeling, each subsystem is modeled using this new approach. In a second step, a new iteration of analysis of each subsystem is performed to restrain system’s unwanted situations. At the end of this step the subsystems are composed by a traditional parallel automatons technique. The resulting system is presented to an optimizer, based in PROLOG, which searches the best event sequence obeying to all modeled restrictions and ends in the marked state defined in design. This result provides the ideal Petri Net of the system and its GRAFCET programming. Such methods will be tested in a flexible real manufacturing system.