Railway Services
Val de Roissy
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.
Development of SIL4 safety software for the fixed automatisms of the future Val de Roissy
> 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.
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