1、BRITISH STANDARD BS EN 61511-2:2004 Incorporating Amendment No. 1 to BS IEC 61511-2:2003 (renumbers the BS IEC as BS EN 61511-2:2004) Functional safety Safety instrumented systems for the process industry sector Part 2: Guidelines for the application of IEC 61511-1 The European Standard EN 61511-2:2
2、004 has the status of a British Standard ICS 13.110; 25.040.01 BS EN 61511-2:2004 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 4 August 2003 BSI 11 May 2005 ISBN 0 580 42376 X National foreword This British Standard is the official English
3、 language version of EN 61511-2:2004. It is identical with IEC 61511-2:2003. The UK participation in its preparation was entrusted by Technical Committee GEL/65, Measurement and control, to Subcommittee GEL/65/1, System considerations, which has the responsibility to: A list of organizations represe
4、nted on this subcommittee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index
5、”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confe
6、r immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgat
7、e them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 70, an inside back cover and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publicati
8、on Amd. No. Date Comments 15577 11 May 2005 Implementation of the European StandardEUROPEAN STANDARD EN 61511-2 NORME EUROPENNE EUROPISCHE NORM December 2004 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektro
9、technische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2004 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 61511-2:2004 E ICS 25.040.01;13.110 English version Functional safety Safety instrumented systems f
10、or the process industry sector Part 2: Guidelines for the application of IEC 61511-1 (IEC 61511-2:2003) Scurit fonctionnelle Systmes instruments de scurit pour le secteur des industries de transformation Partie 2: Lignes directrices pour lapplication de la CEI 61511-1 (CEI 61511-2:2003) Funktionale
11、Sicherheit - Sicherheitstechnische Systeme fr die Prozessindustrie Teil 2: Anleitungen zur Anwendung des Teils 1 (IEC 61511-2:2003) This European Standard was approved by CENELEC on 2004-10-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditio
12、ns for giving this European Standard the status of a national standard without any alteration. Up-to-date 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
13、 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
14、 committees of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. Foreword The
15、text of the International Standard IEC 61511-2:2003, prepared by SC 65A, System aspects, of IEC TC 65, Industrial-process measurement and control, was submitted to the Unique Acceptance Procedure and was approved by CENELEC as EN 61511-2 on 2004-10-01 without any modification. The following dates we
16、re fixed: latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2005-10-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2007-10-01 _ Endorsement notice The text of
17、 the International Standard IEC 61511-2:2003 was approved by CENELEC as a European Standard without any modification. _ Page2 EN605112:2004 2 615-112 EI:C002(3)E CONTENTS INTRODUCTION5 1 Scope 7 2 Normative references. 7 3 Terms, definitions and abbreviations 7 4 Conformance to this International St
18、andard . 7 5 Management of functional safety 8 5.1 Objective 8 5.2 Requirements . 8 6 Safety lifecycle requirements 14 6.1 Objective .14 6.2 Requirements 14 7 Verification .14 7.1 Objective .14 8 Process hazard and risk assessment 15 8.1 Objectives .15 8.2 Requirements 15 9 Allocation of safety func
19、tions to protection layers18 9.1 Objective .18 9.2 Requirements of the allocation process .18 9.3 Additional requirements for safety integrity level 4.20 9.4 Requirement on the basic process control system as a layer of protection.20 9.5 Requirements for preventing common cause, common mode and depe
20、ndent failures 22 10 SIS safety requirements specification .22 10.1 Objective .22 10.2 General requirements 22 10.3 SIS safety requirements.22 11 SIS design and engineering 23 11.1 Objective .23 11.2 General requirements 23 11.3 Requirements for system behaviour on detection of a fault 27 11.4 Requi
21、rements for hardware fault tolerance.27 11.5 Requirements for selection of components and subsystems 29 11.6 Field devices .31 11.7 Interfaces 31 11.8 Maintenance or testing design requirements33 11.9 SIF probability of failure.34 12 Requirements for application software, including selection criteri
22、a for utility software36 12.1 Application software safety lifecycle requirements .36 12.2 Application software safety requirements specification.39 12.3 Application software safety validation planning 41 12.4 Application software design and development41 Page3 EN605112:2004165-112 EI:C002(3)E 3 12.5
23、 Integration of the application software with the SIS subsystem 48 12.6 FPL and LVL software modification procedures .48 12.7 Application software verification.49 13 Factory acceptance testing (FAT) .50 13.1 Objectives .50 13.2 Recommendations.50 14 SIS installation and commissioning.51 14.1 Objecti
24、ves .51 14.2 Requirements 51 15 SIS safety validation .51 15.1 Objective .51 15.2 Requirements 51 16 SIS operation and maintenance 52 16.1 Objectives .52 16.2 Requirements 52 16.3 Proof testing and inspection.52 17 SIS modification54 17.1 Objective .54 17.2 Requirements 54 18 SIS decommissioning54 1
25、8.1 Objectives .54 18.2 Requirements 54 19 Information and documentation requirements54 19.1 Objectives .54 19.2 Requirements 54 Annex A (informative) Example of techniques for calculating the probability of failure on demand for a safety instrumented function .56 Annex B (informative) Typical SIS a
26、rchitecture development57 Annex C (informative) Application features of a safety PLC62 Annex D (informative) Example of SIS logic solver application software development methodology .64 Annex E (informative) Example of development of externally configured diagnostics for a safety-configured PE logic
27、 solver 68 Figure 1 Overall framework of this standard 6 Figure 2 BPCS function and initiating cause independence illustration .20 Figure 3 Software development lifecycle (the V-model) 37 Figure C.1 Logic solver 63 Figure E.1 EWDT timing diagram .70 Table 1 Typical Safety Manual organisation and contents 46 BSIEC615112:2003 3 Page4 EN605112:2004
