Abstract
Modeling a cyber-physical system’s requirement specifications makes it possible to verify its properties w.r.t. the expected behavior. Standard modeling approaches based on automata theory model these systems at the system architecture level, as they have to explicitly encode the notion of states and define explicit transitions between these states. Event Calculus encoding using Answer Set Programming (ASP) allows for elegant and succinct modeling of these dynamic systems at the requirements specification level, thanks to the near-zero semantics gap between the system’s requirement specifications and the Event Calculus encoding. In this work we propose a framework that uses the EARS notation to describe the system requirements, and an Event Calculus reasoner based on s(CASP), a goal-directed Constraint Answer Set Programming reasoner over the rationals/reals, to directly model these requirements. We evaluate our proposal by (i) modeling the well-known Train-Gate-Controller system, a railroad crossing problem, using the EARS notation and Event Calculus, (ii) translating the specifications into s(CASP), and (iii) checking safety and liveness of the system.
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Notes
- 1.
We have made some minor (and inconsequential) changes to the Train-Gate-Controller system to simplify the illustration.
- 2.
We treat
and
as derived fluents. They can also be modeled as trajectories.
and
as derived fluents. They can also be modeled as trajectories.References
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Acknowledgement
We are grateful to Brendan Hall, Jan Fiedor, and Kevin Driscoll of Honeywell Aerospace for discussions. Authors gratefully acknowledge support from NSF grants IIS 1718945, IIS 1910131, IIP 1916206, from Amazon Corp and US DoD, and MICINN projects RTI2018-095390-B-C33 InEDGEMobility (MCIU/AEI/FEDER, UE). Views expressed are authors’ own and not of the funding agencies. We also dedicate this work to the memory of first author’s father, Late Prof. Sitaramaiah Varanasi, who was passionate about Number Theory and ever so curious about Theoretical Computer Science.
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Varanasi, S.C., Arias, J., Salazar, E., Li, F., Basu, K., Gupta, G. (2022). Modeling and Verification of Real-Time Systems with the Event Calculus and s(CASP). In: Cheney, J., Perri, S. (eds) Practical Aspects of Declarative Languages. PADL 2022. Lecture Notes in Computer Science(), vol 13165. Springer, Cham. https://doi.org/10.1007/978-3-030-94479-7_12
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