Beyond lassos: complete SMT-Based bounded model checking for timed automata
FMOODS'12/FORTE'12 Proceedings of the 14th joint IFIP WG 6.1 international conference and Proceedings of the 32nd IFIP WG 6.1 international conference on Formal Techniques for Distributed Systems
SMT-Based induction methods for timed systems
FORMATS'12 Proceedings of the 10th international conference on Formal Modeling and Analysis of Timed Systems
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Safety instrumented systems (SIS) monitor industrial processes and automatically react on dangerous situations. SIS often consist of both logical and time-dependent building blocks. This paper introduces symbolic timed transition systems, a formalism designed for concise and modular description of SIS with clocks and similar time-dependent systems. Furthermore, an implementation of symbolic timed transition systems as an extension to NuSMV is devised. Two ways of checking properties on symbolic timed transition systems are developed: complete, region-abstraction-based model checking using binary decision diagrams and SMT-based bounded model checking. Both approaches are evaluated experimentally.