Functional Safety Assessment of Safety-Related Systems with Non-perfect Proof-Tests
Summary :
The second edition of the international standard of IEC 61508, functional safety of electrical/electronic/programmable electronic safety-related system (SRS), was published in 2010. This international standard adopts a risk-based approach by which safety integrity requirements can be determined. It presents a formula to estimate the hazardous event rate taking account of non-perfect proof-tests. But it is not clear how to derive the formula. In the present paper, firstly, taking account of non-perfect proof-tests, the relationship between the dangerous undetected failure of SRS, the demand on the SRS and hazardous event is modeled by a fault tree and state-transition diagrams. Next, the hazardous event rate is formulated by use of the state-transition diagrams for the determination of the safety integrity requirements. Then, a comparison is made between the formulas obtained by this paper and given in the standard, and it is found that the latter does not always present rational formulation.
- Publication
- IEICE TRANSACTIONS on Fundamentals Vol.E97-A No.8 pp.1739-1746
- Publication Date
- 2014/08/01
- Publicized
- Online ISSN
- 1745-1337
- DOI
- 10.1587/transfun.E97.A.1739
- Type of Manuscript
- PAPER
- Category
- Reliability, Maintainability and Safety Analysis
Authors
Hitoshi MUTA
Tokyo City University
Yoshinobu SATO
Japan Audit and Certification Organization for Environment and Quality (JACO)
Keyword
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Hitoshi MUTA, Yoshinobu SATO, "Functional Safety Assessment of Safety-Related Systems with Non-perfect Proof-Tests" in IEICE TRANSACTIONS on Fundamentals,
vol. E97-A, no. 8, pp. 1739-1746, August 2014, doi: 10.1587/transfun.E97.A.1739.
Abstract: The second edition of the international standard of IEC 61508, functional safety of electrical/electronic/programmable electronic safety-related system (SRS), was published in 2010. This international standard adopts a risk-based approach by which safety integrity requirements can be determined. It presents a formula to estimate the hazardous event rate taking account of non-perfect proof-tests. But it is not clear how to derive the formula. In the present paper, firstly, taking account of non-perfect proof-tests, the relationship between the dangerous undetected failure of SRS, the demand on the SRS and hazardous event is modeled by a fault tree and state-transition diagrams. Next, the hazardous event rate is formulated by use of the state-transition diagrams for the determination of the safety integrity requirements. Then, a comparison is made between the formulas obtained by this paper and given in the standard, and it is found that the latter does not always present rational formulation.
URL: https://global.ieice.org/en_transactions/fundamentals/10.1587/transfun.E97.A.1739/_p
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@ARTICLE{e97-a_8_1739,
author={Hitoshi MUTA, Yoshinobu SATO, },
journal={IEICE TRANSACTIONS on Fundamentals},
title={Functional Safety Assessment of Safety-Related Systems with Non-perfect Proof-Tests},
year={2014},
volume={E97-A},
number={8},
pages={1739-1746},
abstract={The second edition of the international standard of IEC 61508, functional safety of electrical/electronic/programmable electronic safety-related system (SRS), was published in 2010. This international standard adopts a risk-based approach by which safety integrity requirements can be determined. It presents a formula to estimate the hazardous event rate taking account of non-perfect proof-tests. But it is not clear how to derive the formula. In the present paper, firstly, taking account of non-perfect proof-tests, the relationship between the dangerous undetected failure of SRS, the demand on the SRS and hazardous event is modeled by a fault tree and state-transition diagrams. Next, the hazardous event rate is formulated by use of the state-transition diagrams for the determination of the safety integrity requirements. Then, a comparison is made between the formulas obtained by this paper and given in the standard, and it is found that the latter does not always present rational formulation.},
keywords={},
doi={10.1587/transfun.E97.A.1739},
ISSN={1745-1337},
month={August},}
Copy
TY - JOUR
TI - Functional Safety Assessment of Safety-Related Systems with Non-perfect Proof-Tests
T2 - IEICE TRANSACTIONS on Fundamentals
SP - 1739
EP - 1746
AU - Hitoshi MUTA
AU - Yoshinobu SATO
PY - 2014
DO - 10.1587/transfun.E97.A.1739
JO - IEICE TRANSACTIONS on Fundamentals
SN - 1745-1337
VL - E97-A
IS - 8
JA - IEICE TRANSACTIONS on Fundamentals
Y1 - August 2014
AB - The second edition of the international standard of IEC 61508, functional safety of electrical/electronic/programmable electronic safety-related system (SRS), was published in 2010. This international standard adopts a risk-based approach by which safety integrity requirements can be determined. It presents a formula to estimate the hazardous event rate taking account of non-perfect proof-tests. But it is not clear how to derive the formula. In the present paper, firstly, taking account of non-perfect proof-tests, the relationship between the dangerous undetected failure of SRS, the demand on the SRS and hazardous event is modeled by a fault tree and state-transition diagrams. Next, the hazardous event rate is formulated by use of the state-transition diagrams for the determination of the safety integrity requirements. Then, a comparison is made between the formulas obtained by this paper and given in the standard, and it is found that the latter does not always present rational formulation.
ER -
English
