EN 50090-2-3:2005

STANDARDStanovanjski in stavbni elektronski sistemi (HBES) – 2-3. del: Sistemski pregled – Zahteve splošne funkcionalne varnosti za proizvode, ki so namenjeni za vgradnjo v HBESHome and Building Electronic Systems (HBES) – Part 2-3: System overview – General functional safety requirements for products intended to be integrated in HBES©
Standard je založil in izdal Slovenski inštitut za standardizacijo. Razmnoževanje ali kopiranje celote ali delov tega dokumenta ni dovoljenoReferenčna številkaSIST EN 50090-2-3:2005(en)ICS97.120

EUROPEAN STANDARD
EN 50090-2-3 NORME EUROPÉENNE EUROPÄISCHE NORM
February 2005 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
© 2005 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 50090-2-3:2005 E
ICS 97.120
English version
Home and Building Electronic Systems (HBES) Part 2-3: System overview -
General functional safety requirements
for products intended to be integrated in HBES
Systèmes électroniques pour les foyers domestiques et les bâtiments (HBES) Partie 2-3: Vue d'ensemble du système - Exigences générales de sécurité fonctionnelle pour les produits destinés
à être intégrés dans les systèmes HBES
Elektrische Systemtechnik für Heim
und Gebäude (ESHG) Teil 2-3: Systemübersicht -
Anforderungen an die funktionale Sicherheit für Produkte,
die für den Einbau in ESHG
vorgesehen sind
This European Standard was approved by CENELEC on 2004-09-01. 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, 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 This European Standard has been prepared by the Technical Committee CENELEC TC 205, Home and Building Electronic Systems (HBES), joined by the co-operating partner Konnex Association.
The text of the draft was submitted to the formal vote and was approved by CENELEC as EN 50090-2-3 on 2004-09-01. 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)
2005-09-01 – latest date by which the national standards conflicting with the EN have to be withdrawn
(dow)
2007-09-01 This European Standard shall be used as family standard; it is also addressed to Product Committees or, where no suitable product standards exist, to product manufacturer. EN 50090-2-3 is part of the EN 50090 series of European Standards, which will comprise the following parts: Part 1: Standardisation structure Part 2: System overview
Part 3: Aspects of application Part 4: Media independent layers Part 5: Media and media dependent layers Part 6: Interfaces
Part 7: System management Part 8: Conformity Part 9: Installation requirements TRs: CENELEC TC 205 Technical Reports __________

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Contents Introduction.4 1 Scope.4 2 Normative references.4 3 Definitions.5 4 General requirements.7 4.1 General.7 4.2 Method of establishment for the requirements.8 4.2.1 HBES application environment.8 4.2.2 Sources of hazards.8 4.2.3 Hazardous events.8 4.2.4 Derivation of requirements.9 5 Requirements for functional safety.9 5.1 General.9 5.2 Power feeding.10 5.3 Environment.10 5.4 Life time.10 5.5 Reasonably foreseeable misuse.11 5.6 Software and communication.11 5.7 Remote operations.13 5.7.1 General recommendations.13 5.7.2 Within a single building or in its immediate vicinity.13 5.7.3 From outside the building.13 5.7.4 Management.14 Annex A (informative) Example of a method for the determination of safety integrity levels.15 Annex B (informative) Hazards and development of necessary Functional Safety
Requirements.17 Annex C (informative) Some examples of non safety related HBES applications.23 Bibliography.25 Figure A.1 – Risk reduction: General concept.15 Table 1 – Requirements for avoiding inadvertent operations and possible ways to achieve them.14 Table A.1 – Example of risk classification of accidents.16 Table A.2 – Interpretation of risk classes.16

Introduction HBES products integrated in a HBES should be safe for the use in intended applications. This European Standard specifies the general functional safety requirements for HBES following the principles of the basic standard for functional safety EN 61508 and Technical Report R205-012 in particular. This European Standard identifies functional safety issues related to products and their installation. The requirements are based on a risk analysis in accordance with EN 61508. The intention of this European Standard is to allocate, as far as possible, all safety requirements for HBES products in there life cycle.
This European Standard only addresses HBES products.
This European Standard is addressed to committees that develop or modify HBES product/system standards or, where not suitable HBES product standards addressing functional safety exist, to product manufacturer. HBES and HBES products in this European Standard are for non-safety related applications. Additional requirements for safety related HBES will be described, according to EN 61508, in Part 2-4 of the EN 50090-series (under consideration). 1 Scope This European Standard sets the requirements for functional safety for HBES products and systems, a multi-application bus system where the functions are decentralised, distributed and linked through a common communication process. The requirements may also apply to the distributed functions of any equipment connected in a home or building control system if no specific functional safety standard exist for this equipment or system.
The functional safety requirements of this European Standard apply together with the relevant product standard for the device if any. This European Standard is used as a product family standard. It is not intended to be used as a stand-alone standard. This European Standard does not provide functional safety requirements for safety-related systems.
2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 50090-2-1 Home and Building Electronic Systems (HBES) – Part 2-1: System overview - Architecture EN 50090-2-2 Home and Building Electronic Systems (HBES) – Part 2-2: System overview - General technical requirements EN 61508-4:2001 Functional safety of electrical/electronic/programmable electronic safety-related systems – Part 4: Definitions and abbreviations
(IEC 61508-4:1998 + corrigendum 1999)

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EN 61508-5:2001 Functional safety of electrical/electronic/programmable electronic safety-related systems – Part 5: Examples of methods for the determination of safety integrity levels (IEC 61508-5:1998 + corrigendum 1999) EN 61709:1998 Electronic components - Reliability - Reference conditions for failure rates and stress models for conversion (IEC 61709:1996) CEN/CLC Guide 9 Guidelines for the inclusion of Safety Aspects in standards (ISO/IEC Guide 51) EN ISO 9000 series Quality management systems 3 Definitions For the purposes of this document, the following terms and definitions apply.
3.1 architecture specific configuration of hardware and software elements in a system [EN 61508-4:2001, definition 3.3.5] 3.2 authentication means for certifying that the entity sending a message is what or who it purports to be and confirmation that the message is identical to that which was sent 3.3 authorisation mechanism to ensure that the entity or person accessing information, functions or services has the authority to do so 3.4 disturbed communication where for any reason a message being communicated is incomplete, truncated, contains errors or has the correct format but delivers information which is outside the range of expected parameters for such a message 3.5 functional safety freedom from unacceptable risk of harm due to the operation of an HBES, including that resulting from 1) normal operation, 2) reasonably foreseeable misuse, 3) failure, 4) temporary disturbances NOTE 1 Definition of EN 61508-4:2001, 3.1.9: part of the overall safety relating to the EUC (Equipment Under Control) and the EUC control system which depends on the correct functioning of the Electrical/Electronic/Programmable Electronic (E/E/PE) safety related systems, other technology safety related systems and external risk reduction facilities. NOTE 2 Definition of IEC TR3 61000-2-1 and IEC TS 61000-1-2 (IEC/TC 77) are taken into account. 3.6 Hamming distance numbers of bits in which two binary codes differ

3.7 harm physical injury or damage to the health of people either directly or indirectly as a result of damage to property or to the environment
[EN 61508-4:2001, definition 3.1.1] 3.8 hazard a potential source of harm
[CEN/CLC Guide 9, respectively ISO/IEC Guide 51:1990] NOTE The term includes danger to persons arising within a short time scale (for example, fire and explosion) and also those that have a long-term effect on a person’s health (for example, release of a toxic substance). [EN 61508-4:2001, definition 3.1.2] 3.9 hazardous event situation which results in harm on normal operation or abnormal condition NOTE Definition of EN 61508-4:2001, 3.1.3 and 3.1.4: circumstance in which a person is exposed to hazard(s) which results in harm 3.10 HBES, Home and Building Electronic Systems a multi-application bus system where the functions are decentrally distributed and linked through a common communication process NOTE HBES is used in homes and buildings plus their surroundings.
Functions of the system are e.g: switching, open loop controlling, closed loop controlling, monitoring and supervising. 3.11 HBES product HBES products consist of devices in the form of hardware, firmware, their associated software and of configuration tools, intended to be used in an HBES 3.12 product HBES products consist of devices in the form of hardware, firmware, their associated software and of configuration tools 3.13 product documentation – the manufacturer's installation and operations literature which accompanies the product; – the product information contained in the manufacturer's catalogue and other product marketing material-information; – the description, definitions, product literature and usage as presented in electronic format on the manufacturer's (or supplier's) website on the World Wide Web/Internet 3.14 safety related system designated system that both – implements the required safety functions necessary to achieve or maintain a safe state for the EUC, and – is intended to achieve on its own or with other E/E/PE safety related systems, other technology safety-related systems or externa
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