Abstract
A 2 out of 2 computer is used as an example to discuss the safety strategy of hardware redundant vital computers. One prerequisite for safety is a short fault disclosure time. A maximum fault disclosure time is standardised in ENV 50129. ENV 50129 contains a note which recommends a measure how to fulfil the standard’s requirement. This paper analysis whether the standard’s requirement is consistent with the safety target or not, and whether the measure is suitable to meet the requirement. Alternative requirements and measures are recommended.
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References
CENELEC ENV 50129:1998 Railway applications: Safety related electronic systems for signalling
IEC Functional safety of electrical / electronic / programmable electronic safety-related systems; especially Part 2: Requirements for electrical / electronic / programmable electronic safety related systems; 1997-02-01
El Koursi, Meganck (ed.): ACRuDA Deliverable D1; State of the Art-Safety Architectures Synthesis; ACRuDA/INRETS/MK-PM/WP1/D1/97.12/V2
Krebs, Mitra: Fundamentals of Multichannel Vital Computers in ACRuDA Deliverable D7: Synthesis and Conclusion; TÜV Report No.: 947/T 98/130, 25 September 1998
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© 1999 Springer-Verlag Berlin Heidelberg
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Krebs, H., Mitra, S. (1999). Hardware Redundant Vital Computers — Demonstration of Safety on the Basis of Current Standards. In: Felici, M., Kanoun, K. (eds) Computer Safety, Reliability and Security. SAFECOMP 1999. Lecture Notes in Computer Science, vol 1698. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-48249-0_14
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DOI: https://doi.org/10.1007/3-540-48249-0_14
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