Taking Advantage Of Some Complementary
Modelling Methods To Meet Critical System
Requirement Specifications
Author(s)
F. Defossez, P. Bon & S. Collart-Dutilleul
Abstract
This paper aims at showing how it is possible to combine the advantages of highlevel
Petri nets and the B method in order to design safety applications. In the railway
critical software domain, safety requirements are obviously severe. Indeed,
the passing from an informal specification to a formal one is a crucial point in
critical software development. High-level Petri nets combine three important features:
a graphical representation, a dynamic behaviour and an abstraction of the
treatments. The B method allows one to pass from an abstract specification to
a concrete implementation. We propose an approach that integrates the structuring
and modelling of the system behaviour by means of coloured Petri nets from
semi-formal specifications and the generation of a B abstract specification from
this Petri net.
Keywords: railway critical systems, safety, formal methods, model translation,
high-level Petri nets, B method.
1 Introduction
The technological progress of safety automation in railway systems involves a
growing complexity of functional safety requirements. Thereby, this leads to the
use of some technical tools for analysis and command synthesis that are more and
more complex and efficient in order to respect the requirements. Moreover, the
introduction of new European standards for railway safety has led one to reconsider
critical system requirement specifications modelling.
Keywords
railway critical systems, safety, formal methods, model translation,
high-level Petri nets, B method.
Related Book
Other papers in this volume
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