Verification of Fault Tolerance of Discrete-Event Object-Oriented Models using Model Checking

The Object-Oriented (O-O) approach has been recently used in the industrialautomation to design logic control systems, thanks to the features of specification languages(e.g. UML) that can help to describe event-based behavioral requirements. In this paper, weaim to formalise an O-O framework for the design of modular logic controllers, in which faultsoccurring in the plant can alter the behavior of closed-loop system. Given the formal model ofthe system in terms of Kripke structures, it is possible to verify with model checking that evenin case of faults the system do not violate given safety and liveness properties. Moreover, we willconsider the case in which an O-O logic controller is refined applying the so-called “design-by-extension” mechanism, in which case it is important to verify that the fault tolerance propertyis inherited by the refined system.