Active Fault Tolerant Control of Discrete Event System Subjected to Sensors Fault

This study proposes a method for discrete event systems subjected to sensors fault based on timed automata model. A reconfiguration model of the entire system is developed using two different models. First, the plant model, representing the system components with their logical behavior. Secondly, the specification model, representing the system's time rules. Whenever an undiagnosable sensor defect is discovered by time diagnosis, the regular behavior controller is changed into a timed controller, which substitutes the lost sensor signal with timed information. A manufacturing system is used to demonstrate the proposed approach. It is modeled and simulated by Factory I/O simulator and Grafcet studio, results of the simulation in faultless and various faulty scenarios are presented.