Journal of Applied Reliability (한국신뢰성학회지:신뢰성응용연구)

The Korean Reliability Society (한국신뢰성학회)
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A Study on a Safety Life Cycle of IEC 61508 for Functional Safety

기능안전을 위한 IEC 61508의 안전수명주기에 관한 연구

  • Kim, Sung Kyu (Dept. of Industrial and Management Engineering, Graduate School, Kyonggi University) ;
  • Kim, Yong Soo (Dept. of Industrial and Management Engineering, Kyonggi University)
  • 김성규 (경기대학교 대학원 산업경영공학과) ;
  • 김용수 (경기대학교 산업경영공학과)
  • Received : 2014.01.18
  • Accepted : 2014.03.14
  • Published : 2014.03.25
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Abstract

The IEC 61508 standard was established to specify the functional safety of E/E/PE safety-related systems. Safety life cycle to provide the framework and direction for the application of IEC 61508 is included in this standard. In this paper, we describe overviews, objects, scopes, requirements and activities of each phase in safety life cycle. In addition, we introduce safety integrity level(SIL) which is used for verifying the safety integrity requirements of E/E/PE system and perform a case study to estimate hardware SIL by FMEDA. The SIL is evaluated by two criteria. One of them is the architectural constraints which restrict the maximum SIL by combination of SFF and HFT. The other is the probability of failure which is classified into PFD and PFH based on frequency of demand and calculated by safe or dangerous failure rates.

Keywords

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