EN 50128:2001

Railway applications - Communication, signalling and processing systems - Software for railway control and protection systems

1.1 This European Standard specifies procedures and technical requirements for the development of programmable electronic systems for use in railway control and protection applications. It is aimed at use in any area where there are safety implications. These may range from the very critical, such as safety signalling to the non-critical, such as management information systems. These systems may be implemented using dedicated microprocessors, programmable logic controllers, multiprocessor distributed systems, larger scale central processor systems or other architectures. 1.2 This European Standard is applicable exclusively to software and the interaction between software and the system of which it is part. 1.3 Software safety integrity levels above zero are for use in systems in which the consequences of failure could include loss of life. Economic or environmental considerations, however, may also justify the use of higher software safety integrity levels. 1.4 This European Standard applies to all software used in development and implementation of railway control and protection systems including: application programming; operating systems; support tools; firmware. Application programming comprises high level programming, low level programming and special purpose programming (for example: Programmable Logic Controller ladder logic). 1.5 The use of standard, commercially available software and tools is also addressed in this European Standard. 1.6 This European Standard also addresses the requirements for systems configured by application data. 1.7 This European Standard is not intended to address commercial issues. These should be addressed as an essential part of any contractual agreement. All the clauses of this European Standard will need careful consideration in any commercial situation. 1.8 This European Standard is not intended to be retrospective. It therefore applies primarily to new developments and only applies in its entirety to existing systems if these are subjected to major modifications. For minor changes, only clause 16 applies.

Bahnanwendungen - Telekommunikationstechnik, Signaltechnik und Datenverarbeitungssysteme - Software für Eisenbahnsteuerungs- und Überwachungssysteme

Applications ferroviaires - Systèmes de signalisation, de télécommunication et de traitement - Logiciels pour systèmes de commande et de protection ferroviaire

Železniške naprave – Komunikacijski, signalni in procesni sistemi – Programska oprema za železniške krmilne in zaščitne sisteme

General Information

• Status: Withdrawn
• Publication Date: 15-Mar-2001
• Withdrawal Date: 31-Oct-2003
• ICS: 29.280 - Electric traction equipment
• ICS: 45.060.10 - Tractive stock
• Technical Committee: CLC/TC 9X - Electrical and electronic applications for railways
• Drafting Committee: CLC/SC 9XA - Communications, signalling and processing systems
• Parallel Committee: IEC/TC 9 - IEC_TC_9
• Current Stage: 9960 - Withdrawal effective - Withdrawal
• Start Date: 25-Apr-2017
• Completion Date: 25-Apr-2017
• 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
• Ref Project: SIST EN 50128:2002 - Railway applications - Communication, signalling and processing systems - Software for railway control and protection systems

Relations

• Replaced By: EN 50128:2011 - Railway applications - Communication, signalling and processing systems - Software for railway control and protection systems
• Effective Date: 28-Jan-2023

Standards Content (Sample)

SLOVENSKI STANDARD
01-marec-2002
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Railway applications - Communication, signalling and processing systems - Software for
railway control and protection systems
Bahnanwendungen - Telekommunikationstechnik, Signaltechnik und
Datenverarbeitungssysteme - Software für Eisenbahnsteuerungs- und
Überwachungssysteme
Applications ferroviaires - Systèmes de signalisation, de télécommunication et de
traitement - Logiciels pour systèmes de commande et de protection ferroviaire
Ta slovenski standard je istoveten z: EN 50128:2001
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 50128
NORME EUROPÉENNE
EUROPÄISCHE NORM March 2001
ICS 29.280; 45.060.10
English version
Railway applications -
Communications, signalling and processing systems -
Software for railway control and protection systems
Applications ferroviaires - Bahnanwendungen -
Systèmes de signalisation, de Telekommunikationstechnik, Signal-
télécommunication et de traitement - technik und Datenverarbeitungssysteme -
Logiciels pour systèmes de commande Software für Eisenbahnsteuerungs- und
et de protection ferroviaire Überwachungssysteme
This European Standard was approved by CENELEC on 2000-11-01. 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, Iceland, Ireland, Italy, Luxembourg,
Netherlands, Norway, Portugal, 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
© 2001 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 50128:2001 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 50128 on
2000-11-01.
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) 2001-11-01
- latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2003-11-01
This European Standard should be read in conjunction with EN 50126: "Railway applications - The
specification and demonstration of Reliability, Availability, Maintainability and Safety (RAMS)” and
EN 50129: "Railway applications - Safety related electronic systems for signalling".
Annexes designated "normative" are part of the body of the standard.
Annexes designated "informative" are given for information only.
In this standard, annex A is normative and annex B is informative.
__________
- 3 - EN 50128:2001
Contents
Pages
Introduction.5
1 Scope .7
2 Normative references.7
3 Definitions.8
4 Objectives and conformance.11
5 Software safety integrity levels.11
5.1 Objective.11
5.2 Requirements.12
6 Personnel and responsibilities.13
6.1 Objective.13
6.2 Requirements.13
7 Lifecycle issues and documentation .14
7.1 Objectives.14
7.2 Requirements.14
8 Software requirements specification.17
8.1 Objectives.17
8.2 Input documents.17
8.3 Output documents.17
8.4 Requirements.17
9 Software architecture .18
9.1 Objectives.18
9.2 Input documents.19
9.3 Output documents.19
9.4 Requirements.19
10 Software design and implementation.20
10.1 Objectives.20
10.2 Input documents.21
10.3 Output documents.21
10.4 Requirements.21
11 Software verification and testing .24
11.1 Objective.24
11.2 Input documents.24
11.3 Output documents.24
11.4 Requirements.24
12 Software/hardware integration.27
12.1 Objectives.27
12.2 Input documents.27
12.3 Output documents.28
12.4 Requirements.28

13 Software validation.29
13.1 Objective.29
13.2 Input documents.29
13.3 Output documents.29
13.4 Requirements.29
14 Software assessment .31
14.1 Objective.31
14.2 Input documents.31
14.3 Output documents.31
14.4 Requirements.31
15 Software quality assurance.32
15.1 Objectives.32
15.2 Input documents.32
15.3 Output documents.32
15.4 Requirements.32
16 Software maintenance.34
16.1 Objective.34
16.2 Input documents.34
16.3 Output documents.35
16.4 Requirements.35
17 Systems configured by application data .36
17.1 Objectives.36
17.2 Input documents.36
17.3 Output documents.36
17.4 Requirements.37
17.4.1 Data Preparation Lifecycle .37
17.4.2 Data Preparation Procedures and Tools .37
17.4.3 Software Development.38
Annex A (normative) Criteria for the Selection of Techniques and Measures.45
Annex B (informative)  Bibliography of Techniques.60
Figures
Figure 1 – Integrity Levels for Safety-Related Systems .39
Figure 2 – Software Safety Route Map.40
Figure 3 – Development Lifecycle 1 .41
Figure 4 – Development Lifecycle 2 .42
Figure 5 - Independence Versus Software Integrity Level.43
Figure 6 – Relationship between Generic System Development and Application Development .44

- 5 - EN 50128:2001
Introduction
This Standard is part of a group of related Standards. The others are EN 50126 "Railway applications -
The specification and demonstration of Reliability, Availability, Maintainability and Safety (RAMS)” and
EN 50129 "Railway applications - Safety related electronic systems for signalling". EN 50126 addresses
system issues on the widest sca
...