Desenvolvimento de Sistemas de Controle para Sistemas Instrumentados de Segurança (Development of Control Systems for Safety Instrumented Systems)

Reinaldo Squillante (, Diolino José dos Santos (, Fabrício Junqueira (, Paulo Eigi (

1Órion Consultoria e Engenharia em Automação Ltda
2Escola Politécnica da Universidade de São Paulo

This paper appears in: Revista IEEE América Latina

Publication Date: July 2011
Volume: 9,   Issue: 4 
ISSN: 1548-0992

Safety Instrumented Systems (SIS) are designed to prevent and / or mitigate accidents, avoiding undesirable high potential risk scenarios, assuring protection of people's health, protecting the environment and saving costs of industrial equipment. The design of these systems require formal methods for ensuring the safety requirements, but according material published in this area, has not identified a consolidated procedure to match the task . This sense, this article introduces a formal method for diagnosis and treatment of critical faults based on Bayesian network (BN) and Petri net (PN). This approach considers diagnosis and treatment for each safety instrumented function (SIF) including hazard and operability (HAZOP) study in the equipment or system under control. It also uses BN and Behavioral Petri net (BPN) for diagnoses and decision-making and the PN for the synthesis, modeling and control to be implemented by Safety Programmable Logic Controller (PLC). An application example considering the diagnosis and treatment of critical faults is presented and illustrates the methodology proposed.

Index Terms:
safety instrumented system, critical fault diagnosis, critical fault treatment, Bayesian network, Petri net   

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