Supervisores distribuídos para sistemas flexíveis de manufatura utilizando redes de petri.

Abstract

This work aims at the modeling, using Coloured Petri Nets, of a distributed supervisor for Flexible Manufacturing Systems. To promote the coordination of events in a distributed way, a supervisor is assigned to each cell from the FMS. Each Cell Supervisor (CS) performs the internal events coordination from its associated cell, allocate production and transport resources and handle both production resources faults and in the supervisor itself. A significant feature of such an approach is the of communication among decentralized entities to allow cooperative tasks execution. To do so, we propose a reservation resource protocol to discipline the interaction among CSs. Others features considered are the real time resource scheduling through costs criteria, and the ability to tolerate faults. The main motivation to carry on this research is the increasing tendency to adopt distributed supervisors for FMS, since a greater scalability, fault tolerance and the simplification of local resource coordination can be achieved.