prEN 50126-4

Railway applications - The Specification and Demonstration of Reliability, Availability, Maintainability and Safety (RAMS) - Part 4: Functional Safety - Electrical/Electronic/Programmable electronic systems

2014-03 TC Decision: WI to be stopped as draft for vote cannot be delivered on time in the frame of the 3-year timeframe * 2012-06-29 - Enquiry editing allocated to [e-mail] * D144/C085: Second extension of the target date for vote approved to read 2014-03-05 with transfer in the new audit system

Bahnanwendungen - Spezifikation und Nachweis von Zuverlässigkeit, Verfügbarkeit, Instandhaltbarkeit und Sicherheit (RAMS) - Teil 4: Funktionale Sicherheit - Elektrische/Elektronische/Programmierbare elektronische Systeme

Applications ferroviaires - Spécification et démonstration de la fiabilité, de la disponibilité, de la maintenabilité et de la sécurité (FDMS) - Partie 4: Sécurité fonctionnelle - Systèmes électriques/électroniques/électroniques programmables

Železniške naprave - Specifikacija in prikaz zanesljivosti, razpoložljivosti, vzdrževalnosti in varnosti (RAMS) - 4. del: Funkcionalna varnost - Električno/Elektronsko/Programabilni elektronski sistemi

General Information

• Status: Not Published
• Technical Committee: CLC/TC 9X - Electrical and electronic applications for railways
• Current Stage: 1099 - Decision to proceed: launch PQ / UQ or prepare draft for circulation - Evaluation of concrete proposal
• Due Date: 01-Apr-2008
• Completion Date: 01-Apr-2008
• Directive: 2001/16/EC - Directive 2001/16/EC of the European Parliament and of the Council of 19 March 2001 on the interoperability of the trans-European conventional rail system
• Directive: 2008/57/EC - Directive 2008/57/EC of the European Parliament and of the Council of 17 June 2008 on the interoperability of the rail system within the Community (Recast)
• Directive: 96/48/EC - Interoperability of the trans-European high-speed rail system
• Mandate: M/334 - Mandate for programming and standardisation addressed to CEN, CENELEC and ETSI in the field of the Interoperability of the trans-european conventional rail system
• Mandate: M/483 - Mandate for programming and standardisation addressed to the European standardisation bodies under directive 2008/57/EC in the field of the interoperability of the rail system within the European Union
• Ref Project: oSIST prEN 50126-4:2012 - Railway applications - The Specification and Demonstration of Reliability, Availability, Maintainability and Safety (RAMS) - Part 4: Functional Safety - Electrical/Electronic/Programmable electronic systems

Relations

• Revised: EN 50129:2003 - Railway applications - Communication, signalling and processing systems - Safety related electronic systems for signalling
• Effective Date: 07-Jun-2022

Standards Content (Sample)

SLOVENSKI STANDARD
oSIST prEN 50126-4:2013
01-januar-2013
äHOH]QLãNHQDSUDYH6SHFLILNDFLMDLQSULND]]DQHVOMLYRVWLUD]SRORåOMLYRVWL
Y]GUåHYDOQRVWLLQYDUQRVWL5$06GHO)XQNFLRQDOQDYDUQRVW
(OHNWULþQR(OHNWURQVNR3URJUDPDELOQLHOHNWURQVNLVLVWHPL
Railway applications - The Specification and Demonstration of Reliability, Availability,
Maintainability and Safety (RAMS) - Part 4: Functional Safety -
Electrical/Electronic/Programmable electronic systems
Bahnanwendungen - Spezifikation und Nachweis von Zuverlässigkeit, Verfügbarkeit,
Instandhaltbarkeit und Sicherheit (RAMS) - Teil 4: Funktionale Sicherheit -
Elektrische/Elektronische/Programmierbare elektronische Systeme
Applications ferroviaires - Spécification et démonstration de la fiabilité, de la disponibilité,
de la maintenabilité et de la sécurité (FDMS) - Partie 4: Sécurité fonctionnelle -
Systèmes électriques/électroniques/électroniques programmables
Ta slovenski standard je istoveten z: prEN 50126-4:2012
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
oSIST prEN 50126-4:2013 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

oSIST prEN 50126-4:2013
oSIST prEN 50126-4:2013
DRAFT
EUROPEAN STANDARD
NORME EUROPÉENNE
October 2012
EUROPÄISCHE NORM
ICS Will supersede EN 50129:2003

English version
Railway applications -
The Specification and Demonstration of Reliability, Availability,
Maintainability and Safety (RAMS) -
Part 4: Functional Safety -
Electrical/Electronic/Programmable electronic systems

Applications ferroviaires -  Bahnanwendungen -
Spécification et démonstration de la fiabilité, de la Spezifikation und Nachweis von Zuverlässigkeit,
disponibilité, de la maintenabilité et de la sécurité Verfügbarkeit, Instandhaltbarkeit und Sicherheit
(FDMS) - (RAMS) -
Partie 4: Sécurité fonctionnelle - Teil 4: Funktionale Sicherheit -
Systèmes électriques/électroniques/électroniques Elektrische/Elektronische/Programmierbare
programmables elektronische Systeme

This draft European Standard is submitted to CENELEC members for CENELEC enquiry.
Deadline for CENELEC: 2013-03-29.

It has been drawn up by CLC/TC 9X.

If this draft becomes a European Standard, 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.

This draft European Standard was established by CENELEC 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 CEN-CENELEC
Management Centre has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.

Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are aware and to
provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice
and shall not be referred to as a European Standard.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Management Centre: Avenue Marnix 17, B - 1000 Brussels

© 2012 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Project: 21754 Ref. No. prEN 50126-4:2012 E

oSIST prEN 50126-4:2013
7001 Contents Page
7002 Foreword . 6
7003 Introduction . 8
7004 1 Scope . 9
7005 2 Normative references . 10
7006 3 Terms and definitions . 10
7007 4 Abbreviations. 11
7008 5 Overall Framework of the Part 4 . 13
7009 6 E/E/PE systems management and organisation . 15
7010 6.1 Lifecycle Issues and Documentation . 15
7011 6.2 Organisation, Roles and Responsibilities . 18
7012 6.3 Personnel Competence . 20
7013 7 E/E/PE systems assurance . 21
7014 7.1 Analysis . 21
7015 7.2 Testing . 23
7016 7.3 Verification. 24
7017 7.4 Validation. 26
7018 7.5 Independent Assessment. 29
7019 7.6 Quality Assurance . 31
7020 7.7 Safety Management . 33
7021 7.8 Configuration Management and Modification Control . 35
7022 7.9 Support Tools . 37
7023 8 E/E/PE system development: system aspects . 39
7024 8.1 Additional Requirements for E/E/PE Architecture . 39
7025 8.2 Integration and Validation . 45
7026 9 E/E/PE development: Generic hardware . 52
7027 9.1 Hardware Component Specification . 52
7028 9.2 Hardware Component Implementation . 54
7029 9.3 Hardware Component Validation . 55
7030 10 E/E/PE development: Configurable hardware . 56
7031 10.1 Requirements . 56
7032 11 E/E/PE systems operation and maintenance . 56
7033 11.1 Planning & Organisation . 56
7034 11.2 System Deployment . 58
7035 11.3 Operation and Maintenance including Performance Monitoring . 60
7036 11.4 Modification . 63
7037 Annex A (normative) Techniques/Measures . 64
7038 Annex B (normative) Electronic/Electrical Component failure modes . 77
7039 B.1 Introduction. 77
7040 B.2 General Procedure . 77
7041 B.3 Procedure for Integrated Circuits (including Microprocessors) . 77
7042 B.4 Procedure for Electronic/Electrical Components with Inherent Physical Properties . 78
7043 B.5 General Observations concerning Electronic/Electrical Component Failure Modes . 79

oSIST prEN 50126-4:2013
- 3 - prEN 50126-4:2012
7044 B.6 Additional General Observations, concerning Electronic/Electrical Components with
7045 Inherent Physical Properties . 79
7046 B.7 Specific Observations concerning Electronic/Electrical Components with Inherent
7047 Physical Properties . 80
7048 Annex C (normative) Key Hardware/System Safety Roles and Responsibilities . 97
7049 Annex D (informative) Technical Recommendations for SIL3 and SIL4 functions . 110
7050  Introduction. 110
D.1
7051 D.2 Achievement of Physical Internal Independence . 110
7052 D.3 Achievement of Physical External Independence . 111
7053 D.4 Single-fault Detection . 112
7054 D.5 Multiple-fault Detection . 113
7055 Annex E (informative) Guidance on Programmable Devices . 117
7056  Introduction. 117
E.1
7057 E.2 Relation to EN 50126-5 . 118
7058 E.3 Pre-existing programmable devices . 133
7059 Annex F (normative) Previously Developed Hardware (PDH) and Commercial Off The Shelf
7060 Hardware (COTSH) . 134
7061 Annex G (informative) Structure of Hardware/Systems Safety Cases . 136
7062 G.1 Generic Product Safety Case Guidance for E/E/PE . 136
7063 G.2 Generic Application Safety Case Guidance for E/E/PE . 145
7064 G.3 Specific Application Safety Case Guidance for E/E/PE . 145
7065 G.4 Cross-Acceptance Safety Case Guidance for E/E/PE . 146
7066 G.4.1Cross-Acceptance Process . 146
7067 Annex H (informative) Bibliography of techniques . 149
7068 H.1 Introduction. 149
7069 H.2 Techniques . 161
7071 Figure 1 – Illustrative Development Lifecycle . 16
7072 Figure 2 – Illustrative Development and System Integration Lifecycle . 17
7073 Figure 3 – Independence and Combination of Roles versus Safety Integrity Levels . 19
7074 Figure 4 – Detection and negation of single faults . 42
7075 Figure B.1 – Example of a 4-terminal Resistor using a hybrid thick layer technique . 80
7076 Figure D.1 –Single-fault and Multiple-fault detection conditions . 114
7077 Figure G.2 – Structure of Technical Safety Report . 138
7079 Table 1 – Relation between Tool Class and applicable p
...