EN 50129:2003

SLOVENSKI STANDARD
01-maj-2003
1DGRPHãþD
SIST ENV 50129:1998
Železniške naprave – Komunikacijski, signalni in procesni sistemi – Signalno-
varnostni elektronski sistemi
Railway applications - Communication, signalling and processing systems - Safety
related electronic systems for signalling
Bahnanwendungen - Telekommunikationstechnik, Signaltechnik und
Datenverarbeitungssysteme - Sicherheitsrelevante elektronische Systeme für
Signaltechnik
Applications ferroviaires - Systèmes de signalisation, de télécommunications et de
traitement - Systèmes électroniques de sécurité pour la signalisation
Ta slovenski standard je istoveten z: EN 50129:2003
ICS:
35.240.60 Uporabniške rešitve IT v IT applications in transport
transportu in trgovini and trade
45.020 Železniška tehnika na Railway engineering in
splošno general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN 50129
NORME EUROPÉENNE
EUROPÄISCHE NORM February 2003

ICS 93.100 Supersedes ENV 50129:1998

English version
Railway applications –
Communication, signalling and processing systems –
Safety related electronic systems for signalling

Applications ferroviaires –  Bahnanwendungen -
Systèmes de signalisation, Telekommunikationstechnik,
de télécommunications et de traitement - Signaltechnik und
Systèmes électroniques de sécurité Datenverarbeitungssysteme -
pour la signalisation 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.

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
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.
__________
– 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

Annex D (informative) Supplementary technical information.77
D.1 Introduction.77
D.2 Achievement of physical internal independence .77
D.3 Achievement of physical external independence .78
D.4 Example of a method for single-fault analysis.79
D.5 Example of a method for multiple-fault analysis.80
Annex E (informative) Techniques and measures for safety-related electronic systems for
signalling for the avoidance of systematic faults and the control of random and systematic
faults .85
Bibliography.94
Figure 1 – Scope of the main CENELEC railway application standards .8
Figure 2 – Structure of EN 50129.15
Figure 3 – Structure of Safety Case .17
Figure 4 – Example of system life-cycle .19
Figure 5 – Example of design and validation portion of system life-cycle .21
Figure 6 – Arrangements for independence.22
Figure 7 – Structure of Technical Safety Report .26
Figure 8 – Safety acceptance and approval process.28
Figure 9 – Examples of dependencies between Safety Cases/Safety Approval.29
Figure A.1 – Safety requirements and safety integrity.30
Figure A.2 – Global process overview.32
Figure A.3 – Example risk analysis process.33
Figure A.4 – Definition of hazards with respect to the system boundary.34
Figure A.5 – Example hazard control process.36
Figure A.6 – Interpretation of failure and repair times .37
Figure A.7 – Treatment of functional independence by FTA.38
Figure A.8 – Relationship between SILs and techniques .40
Figure B.1 – Influences affecting the independence of items.46
Figure B.2 – Detection and negation of single faults .49
Figure D.1 – Example of a fault analysis method .81
Table A.1 – SIL-table.41
Table C.1 – Resistors .61
Table C.2 – Capacitors.62
Table C.3 – Electromagnetic components.63
Table C.4 – Diodes.66
Table C.5 – Transistors .67
Table C.6 – Controlled rectifiers .69
Table C.7 – Surge Suppressors .71
Table C.8 – Opto-electronic components.72
Table C.9 – Filters .73
Table C.10 – Interconnection assemblies .74

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