A Fault Tolerant Colored Petri Net Model for Flexible Manufacturing Systems

• Autor(a) principal: Barros,Tomaz C.
• Data de Publicação: 1997
• Outros Autores: Figueiredo,Jorge C.A. de, Perkusich,Angelo
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Journal of the Brazilian Computer Society
• Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0104-65001997000300002
• topic: Fault Tolerance; Forward Recovery; Backward Recovery; Flexible Manufacturing Systems; Colored Petri Nets

This paper introduces an approach based on Colored Petri Nets (CPN) to systematically introduce fault-tolerance in the design of a supervisor for a Flexible Manufacturing System (FMS). The system is modeled by means of Place/Transition nets and then is structurally reduced, resulting in a CPN that is independent of a specific production route. The introduction of fault tolerance in the design of such a supervisor considers both forward recovery and backward recovery. For forward recovery we anticipate faults in resources in a production route and reschedule the production routes for production orders before the faulty resource is reached. The backward recovery is considered at the level of a resource in such a way that when a faulty resource is fixed, the operation restarts on the last consistent operation executed