Basic consideration for SIL calculation in safety systems

  • Authors:

  • J. Börcsök;P. Holub

  • Affiliations:

  • Computer Architecture and System Programming, University of Kassel, Kassel, Germany;Computer Architecture and System Programming, University of Kassel, Kassel, Germany

  • Venue:
  • ACACOS'08 Proceedings of the 7th WSEAS International Conference on Applied Computer and Applied Computational Science
  • Year:
  • 2008

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Abstract

Safety instrumented systems might be evaluated regarding their safety-relevant availability in the occurrence of an error. By means of the procedures indicated in the IEC/EN 61508 standard such a value, called Probability of Failure on Demand (PFD), can be determined. The standard IEC/EN 61508 serves as generic standard for the development of sensitive electrical, electronic and programmable electronic systems. This standard supplies qualitative and quantitative criteria to evaluate safety related systems, in order to apply it in safety critical applications. The purpose of this paper is to describe the criterion PFD, to derive the necessary equations and to calculate the PFD-values for the 1oo2-architecture. The PFD value indicates the quality of a system.