Industrialising A Proof-based Verification
Approach Of Computerised Interlocking Systems
Author(s)
S. Behnia, A. Mammar, J.-M. Mota, N. Breton,
P. Caspi & P. Raymond
Abstract
This paper describes the formal verification of an interlocking system.We have formally
proved the non-derailing and non-collision safety properties for an existing
interlocking system operating on Paris Metro’s line 3Bis. These high-level properties
have first been refined to an intermediate level permitting their expression
in terms of the control system’s inputs and outputs. The resulting properties have
then been formalised in the Prover iLock Verifier engine’s internal language. The
Prover iLock Verifier engine is a COTS commercialised by Prover Technology.
For this project some specific features have been added to the engine to provide
certified proofs that can be used, instead of testing, in the SIL-4 qualification process
of interlocking systems.
Keywords: formal verification, interlocking application, proof certification, environment
modelling.
1 Introduction
Interlocking systems are safety critical systems and thus require thorough validation
before being set into operation. Usually, this validation is performed by means
of testing and even though the experience of several decades shows that intensive
testing is a very safe approach, it is also very expensive: the experience of RATP,
Keywords
formal verification, interlocking application, proof certification, environment
modelling.
Related Book
Other papers in this volume
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