【正文】 No. Date Comments 10632 Corrigendum August 1999 Incorporation of IEC Corrigendum April 1999 13782 15 March 2020 Implementation of the European Standard Licensed Copy: Institute Of Technology Tallaght, Institute of Technology, Mon Jun 11 16:24:19 GMT+00:00 2007, Uncontrolled Copy, (c) BSI BS EN 615084:2020 National foreword This British Standard is the official English language version of EN 615084:2020. It is identical with IEC 615084:1998 including corrigendum April 1999. The UK participation in its preparation was entrusted to Technical Committee GEL/65, Measurement and control, to Submittee GEL/65/1, System considerations, which has the responsibility to: — aid enquirers to understand the text。 — monitor related international and European developments and promulgate them in the UK. A list of anizations represented on this mittee can be obtained on request to its secretary. Crossreferences The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogu e under the section entitled ―International Standards Correspondence Index‖, or by using the ―Find‖ facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. This British Standard, having been prepared under the direction of the Electro te c hnical Sector Comm itte e, was published under the authority of the Standards Committee and es into effect on 15 June 1999 169。ENNE EUROP196。 English version Functional safety of electrical/electronic/programmable electronic safetyrelated systems Part 4: Definitions and abbreviations (IEC 615084:1998 + corrigendum 1999) S233。 fonctionnelle des syst232。lectriques/233。lectroniques programmables relatifs 224。curit233。finitions et abr233。rzungen (IEC 615084:1998 + Corrigendum 1999) This European Standard was approved by CENELEC on 20200703. CENELEC members are bound to ply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Uptodate lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions. CENELEC members are the national electrotechnical mittees of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CENELEC European Committee for Electrotechnical Standardization Comit233。en de Normalisation Electrotechnique Europ228。r Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B 1050 Brussels 169。 IEC 62061, Safety of machinery – Functional safety of electrical, electronic and programmable electronic control systems。 EN 50128 and prEN 50129). NOTE EN 50126 and EN 50128 were based on earlier drafts of IEC 61508. prEN 50129 is based on the principles of the latest version of IEC 61508. This list does not preclude other sector implementations of IEC 61508 which could be currently under development or published within IEC or CENELEC. Page 3 EN 61508?4:2020 Licensed Copy: Institute Of Technology Tallaght, Institute of Technology, Mon Jun 11 16:24:19 GMT+00:00 2007, Uncontrolled Copy, (c) BSI Endorsement notice The text of the International Standard IEC 615084:1998 including its corrigendum April 1999 was approved by CENELEC as a European Standard without any modification. In the official version, for Bibliography, the following note has to be added for the standard indicated: IEC 611313:1993 NOTE Harmonized as EN 611313:1993 (not modified). ISO 90003:1991 NOTE Harmonized as EN 290003:1993 (not modified). Page 4 EN 61508?4:2020 Licensed Copy: Institute Of Technology Tallaght, Institute of Technology, Mon Jun 11 16:24:19 GMT+00:00 2007, Uncontrolled Copy, (c) BSI CONTENTS Page INTRODUCTION ............................................................................................................. 5 Clause 1 Scope ......................................................................................................................... 7 2 Normative references ................................................................................................. . 9 3 Definitions and abbreviations ..................................................................................... 10 Safety terms ................................................................................................... . 10 Equipment and devices ................................................................................... . 11 Systems: general aspects .................................................................