A methodology for the assignment of safety integrity levels (SILS) to safety-related control functions implemented by safety-related electrical, electronic and programmable electronic control systems of machines.

Title	A methodology for the assignment of safety integrity levels (SILS) to safety-related control functions implemented by safety-related electrical, electronic and programmable electronic control systems of machines.
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Author	Charlwood, M. Innovation Electronics (UK) Ltd. Turner, S. and Worsell, N. Health and Safety Laboratory for HSE.
Series Code	RR
Series Number	216
Publisher	HSE BOOKS
Date of Publication	2004
Length	71 pages
ISBN	0717628329
Notes	research report 216. (RR216) (RR 216) WEB VERSION ONLY
Abstract	This contract research report describes the development by the authors, with funding from HSE, of a methodology for the assignment of required Safety Integrity Levels (SILs) of safety related electrical control systems of machinery. The rationale behind the methodology and how to use it in practice are also explained in some detail. The methodology has been developed and accepted for inclusion in an informative annex of the International Electrotechnical Committee standard IEC 62061: “Safety of machinery - functional safety of electrical, electronic and programmable control systems for machinery” currently being drafted. Contents: Acknowledgements; Introduction; Background; Objectives; SIL assignment methodology; Assumptions implicit in the SIL methodology; Validation; Conclusions; Recommendations; Appendices; References. This report and the work it describes were funded by the Health and Safety Executive (HSE). Its contents, including any opinions and/or conclusions expressed, are those of the authors alone and do not necessarily reflect HSE policy.
Keywords	Research