A Distributed Algorithm for On-line Diagnosis of Place-bordered Petri Nets

A new distributed algorithm for on-line fault detection and isolation of discreteevent systems modeled by Petri nets is presented. The algorithm is applicable to systems modeled in a modular manner by means of place-bordered Petri nets, i.e., Petri nets with common places but distinct transitions. These Petri nets have transition labeled with events; fault events are modeled as transitions labeled with unobservable events. It is assumed that the diagnoser modules are able to communicate in real-time during the diagnostic process. A merge function is defined to combine the individual diagnoser states and recover the complete diagnoser state that would be obtained under a monolithic approach. Copyright c ©2005 IFAC