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BRITISH STANDARD
BS EN
50129:2003
Railway applications —
Communication,
signalling and
processing systems —
Safety related
electronic systems for
signalling
The European Standard EN 50129:2003 has the status of a
British Standard
ICS 93.100
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COPYRIGHT 2003; British Standards Institution on ERC Specs and Standards
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BS EN 50129:2003
This British Standard was
published under the authority
of the Standards Policy and
Strategy Committee on
7 May 2003
© BSI 7 May 2003
ISBN 0 580 41814 6
National foreword
This British Standard is the official English language version of
EN 50129:2003. It supersedes DD ENV 50129:1999 which is withdrawn.
The UK participation in its preparation was entrusted by Technical Committee
GEL/9, Railway electrotechnical applications, to Subcommittee GEL/9/1,
Signalling and communications, which has the responsibility to:
A list of organizations represented 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”, 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 confer 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
promulgate them in the UK.
Summary of pages
This document comprises a front cover, an inside front cover, the EN title page,
pages 2 to 94, an inside back cover and a back cover.
The BSI copyright date displayed in this document indicates when the
document was last issued.
Amendments issued since publication
Amd. No. Date Comments
COPYRIGHT 2003; British Standards Institution on ERC Specs and Standards
Document provided by IHS Licensee=Hong Kong Polytechnic Univ/9976803100, User=,
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EUROPEAN STANDARD EN 50129
NORME EUROPÉENNE
EUROPÄISCHE NORM
February 2003
CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
Central Secretariat: rue de Stassart 35, B - 1050 Brussels
© 2003 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 50129:2003 E
ICS 93.100 Supersedes ENV 50129:1998
English version
Railway applications –
Communication, signalling and processing systems –
Safety related electronic systems for signalling
Applications ferroviaires –
Systèmes de signalisation,
de télécommunications et de traitement -
Systèmes électroniques de sécurité
pour la signalisation
Bahnanwendungen -
Telekommunikationstechnik,
Signaltechnik und
Datenverarbeitungssysteme -
Sicherheitsrelevante elektronische
Systeme für Signaltechnik
This European Standard was approved by CENELEC on 2002-12-01. CENELEC members are bound to
comply with the CEN/CENELEC Internal Regulations which stipulate the conditions 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 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 committees of Austria, Belgium, Czech Republic,
Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta,
Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and United Kingdom.
COPYRIGHT 2003; British Standards Institution on ERC Specs and Standards
Document provided by IHS Licensee=Hong Kong Polytechnic Univ/9976803100, User=,
11/04/2003 07:10:26 MST Questions or comments about this message: please call
the Document Policy Group at 1-800-451-1584.
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EN 50129:2003 – 2 –
Foreword
This European Standard was prepared by SC 9XA, Communication, signalling and processing systems, of
Technical Committee CENELEC TC 9X, Electrical and electronic applications for railways.
The text of the draft was submitted to the formal vote and was approved by CENELEC as EN 50129 on
2002-12-01.
This European Standard supersedes ENV 50129:1998.
This European Standard was prepared under a mandate given to CENELEC by the European
Commission and the European Free Trade Association and supports the essential requirements of
Directive 96/48/EC.
The following dates were 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) 2003-12-01
- latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2005-12-01
Annexes designated "normative" are part of the body of the standard.
Annexes designated "informative" are given for information only.
In this standard, Annexes A, B and C are normative and Annexes D and E are informative.
__________
COPYRIGHT 2003; British Standards Institution on ERC Specs and Standards
Document provided by IHS Licensee=Hong Kong Polytechnic Univ/9976803100, User=,
11/04/2003 07:10:26 MST Questions or comments about this message: please call
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– 3 – EN 50129:2003
Contents
Page
Introduction................................................................................................................................................6
1 Scope...................................................................................................................................................7
2 Normative references.........................................................................................................................8
3 Definitions and abbreviations...........................................................................................................9
3.1 Definitions..................................................................................................................................9
3.2 Abbreviations...........................................................................................................................13
4 Overall framework of this standard................................................................................................14
5 Conditions for safety acceptance and approval ...........................................................................15
5.1 The Safety Case......................................................................................................................15
5.2 Evidence of quality management ............................................................................................17
5.3 Evidence of safety management .............................................................................................20
5.4 Evidence of functional and technical safety.............................................................................24
5.5 Safety acceptance and approval .............................................................................................26
Annex A (normative) Safety Integrity Levels.........................................................................................30
A.1 Introduction.........................................................................................................................................30
A.2 Safety requirements ...........................................................................................................................30
A.3 Safety integrity....................................................................................................................................31
A.4 Allocation of safety integrity requirements..........................................................................................31
A.5 Safety Integrity Levels ........................................................................................................................39
Annex B (normative) Detailed technical requirements ........................................................................42
B.1 Introduction.........................................................................................................................................42
B.2 Assurance of correct functional operation..........................................................................................42
B.3 Effects of faults...................................................................................................................................44
B.4 Operation with external influences ....................................................................................................50
B.5 Safety-related application conditions..................................................................................................51
B.6 Safety Qualification Tests...................................................................................................................53
Annex C (normative) Identification of hardware component failure modes......................................55
C.1 Introduction.........................................................................................................................................55
C.2 General procedure .............................................................................................................................55
C.3 Procedure for integrated circuits (including microprocessors) ...........................................................55
C.4 Procedure for components with inherent physical properties.............................................................55
C.5 General notes concerning component failure modes.........................................................................56
C.6 Additional general notes, concerning components with inherent physical properties ........................56
C.7 Specific notes concerning components with inherent physical properties .........................................57
COPYRIGHT 2003; British Standards Institution on ERC Specs and Standards
Document provided by IHS Licensee=Hong Kong Polytechnic Univ/9976803100, User=,
11/04/2003 07:10:26 MST Questions or comments about this message: please call
the Document Policy Group at 1-800-451-1584.
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