Development of SIL4 safety software for the fixed automatisms of the future Val de Roissy

The simplified system

Realization of the Safety Software with the B Method

Siemens Transportation Systems (STS) has subcontracted with ClearSy for the realization with B of the safety software for the automatisms of the future VAL de ROISSY: alarm control unit (UCA) and automatic section drivers (PADS) for Siemens. This software represents approximately 150,000 ADA lines once completed. The software is classified as SIL4, according to standards IEC61508: EN50126, EN50128, EN50129

A few figures...

On the L1 VAL line inaugurated on 4th April 2007, 2 computers have been installed: the UCA and PADS (as many PADS as required - S for Section).

For the PADS software:

186,440 lines for the AS Ada safety code (AS - Safety Application)
30,632 lines for the AS non safety-critical Ada code
number of mathematical Proofs: 62,056
number of B lines: 256,653 lines

For the UCA software:

50,085 lines for the AS Ada safety code
11,662 lines for the AS non safety-critical Ada code
number of mathematical Proofs: 12,811
number of B lines: 65,722 lines

The number of effective B lines is smaller than that announced as comments are taken into account, including remarks which guide refinement.

A second line for Charles de Gaulles airport is due to be inaugurated in June 2007.

Publications and Feedback

Introduction document: realization of SIL4 safety software for the Val de Roissy: download
Conférence ZB2005 : Article "Using B as a High Level Programming Language in an Industrial Project": download
Conférence ZB2005 : "Using B as a High Level Programming Language in an Industrial Project" (slides): download
Meteor: "A Successful Application of B in a Large Project", FM'99, Toulouse, France, 1999 - Behm P., Benoît P., Faivre A., Meynadier J.-M. SpringerLink.com
Vital software: Formal method and coded processor - ERTS 2006 - 25-27 January 2006 - Toulouse - Dollé D. download the article
Formal Methods in Industry: Achievements, Problems, Future - Jean Raymond Abrial Swiss Federal Institute of Technology Zurich: Portal.acm.org
MetroPole : download the article