A Formal Model of Requirements
Francois Defossez*, 1, 2, Simon Collart-Dutilleul1, 3, Philippe Bon1, 2
Identifiers and Pagination:Year: 2011
First Page: 60
Last Page: 70
Publisher Id: TOTJ-5-60
Article History:Received Date: 25/5/2010
Revision Received Date: 23/8/2010
Acceptance Date: 29/9/2010
Electronic publication date: 6/10/2011
Collection year: 2011
open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: https://creativecommons.org/licenses/by/4.0/legalcode. This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
This paper introduces a methodology to analyze the safety of timed discrete event systems. Our case-study is the level crossing, a critical component for the safety of railway systems. First, our goal is to take out the forbidden state highlighted by a p-time Petri net modelling. This model deals with the requirements of the considered system and has to contain all the constraints that have to be respected. Then we describe a process identified as a solution for the system functioning. This method consists in exploring all the possible behaviors of the system by means of the construction of state classes. Finally, we check if the proposed process corresponds to the model of requirements previously built.