Safety integrity evaluation framework for fault-tolerant control logic according to IEC 61508

  • Koichi Suyama
Conference paper


This paper presents a safety integrity evaluation framework for a control logic designed especially by a fault-tolerant control logic design technique according to the international safety standard, IEC 61508. The framework is based on demand frequency on safety-related systems from a control system. It clarifies a concrete contribution of fault-tolerant control logic to risk reduction.


Probability Density Function Control Logic Reference Case Demand Rate Tolerable Risk 
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  1. 1.
    International Electrotechnical Commission (IEC). IEC 61508: Functional safety of electrical / electronic / programmable electronic safety related systems. 1998-2000Google Scholar
  2. 2.
    International Organization for Standardization (ISO) and International Electrotechnical Commission (IEC). ISO/IEC Guide 51: Guidelines for the inclusion of safety aspects in standards. 2nd edition, 1999Google Scholar
  3. 3.
    Suyama K. Systematization of reliable control. Proceedings of the 2002 American Control Conference, 2002, pp 5110-5118Google Scholar
  4. 4.
    Suyama K. Functional safety analysis of safety-related systems using majority decision according to IEC 61508. Proceedings of the 2003 American Control Conference, 2003, pp 1788-1795Google Scholar

Copyright information

© Springer-Verlag London 2004

Authors and Affiliations

  • Koichi Suyama
    • 1
  1. 1.Tokyo University of Marine Science and Technology EtchujimaKoto-ku, TokyoJapan

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