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Paper Abstract and Keywords
Presentation 2025-12-04 14:10
Fault-diagnostic and -reaction functional-elements for the safety-related control systems of machinery -- Differences in the results of functional safety assessment based on the requirements of ISO 13849-1 and IEC 61508 --
Ko Kawashima (ORIENTAL MOTOR), Yoshinobu Sato (Institute of Healthcare Quality Improvement) R2025-50
Abstract (in Japanese) (See Japanese page) 
(in English) In the previous study, the hazardous event rate (HER), PFH, and PFDavg for the Category 2 architecture provided by ISO 13849-1, where the test and the functional channels are mutually independent, were formulated based on IEC 61508. In this paper, the differences in the functional safety assessment between ISO 13849-1 and IEC 61508 are studied, and the HER, PFH and PFDavg are formulated for such architectures as designed in actual machinery, including those having shared common parts between the functional and test channels. These formulations are available for the protection layers, regardless of the presence or absence of shared common parts, or multiple operating modes. Consequently, this study proposes an approach to overcome the issues existing standards by which proper quantitative evaluation is difficult, namely, such issues as the exclusion of low demand mode operation from the scope of ISO 13849-1 and the absence of specifically presented evaluation methods for multiple protection layers with shared common parts in the current IEC 61508.
Keyword (in Japanese) (See Japanese page) 
(in English) Functional Safety / Fault-Diagnostic / Hazardous Event Rate / Dependability-Characteristics / Shared Common Parts / / /  
Reference Info. IEICE Tech. Rep., vol. 125, no. 268, R2025-50, pp. 7-12, Dec. 2025.
Paper # R2025-50 
Date of Issue 2025-11-27 (R) 
ISSN Online edition: ISSN 2432-6380
Copyright
and
reproduction		 All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
Download PDF R2025-50

Conference Information
Committee R  
Conference Date 2025-12-04 - 2025-12-04 
Place (in Japanese) (See Japanese page) 
Place (in English) Kikai-Shinko-Kaikan Bldg. 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Reliability International Standard, Maintainability, Reliability General, Safety General 
Paper Information
Registration To R 
Conference Code 2025-12-R 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Fault-diagnostic and -reaction functional-elements for the safety-related control systems of machinery 
Sub Title (in English) Differences in the results of functional safety assessment based on the requirements of ISO 13849-1 and IEC 61508 
Keyword(1) Functional Safety  
Keyword(2) Fault-Diagnostic  
Keyword(3) Hazardous Event Rate  
Keyword(4) Dependability-Characteristics  
Keyword(5) Shared Common Parts  
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1st Author's Name Ko Kawashima  
1st Author's Affiliation ORIENTAL MOTOR (ORIENTAL MOTOR)
2nd Author's Name Yoshinobu Sato  
2nd Author's Affiliation Institute of Healthcare Quality Improvement (Institute of Healthcare Quality Improvement)
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Speaker Author-1 
Date Time 2025-12-04 14:10:00 
Presentation Time 25 minutes 
Registration for R 
Paper # R2025-50 
Volume (vol) vol.125 
Number (no) no.268 
Page pp.7-12 
#Pages 6 
Date of Issue 2025-11-27 (R) 

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