SIST EN 50491-4-1:2012
(Main)General requirements for Home and Building Electronic Systems, HBES and Building Automation and Control Systems (BACS) - Part 4-1: General functional safety requirements for products intended to be integrated in Building Electronic Systems (HBES) and Building Automation and Control Systems (BACS)
General requirements for Home and Building Electronic Systems, HBES and Building Automation and Control Systems (BACS) - Part 4-1: General functional safety requirements for products intended to be integrated in Building Electronic Systems (HBES) and Building Automation and Control Systems (BACS)
This European Standard sets the requirements for functional safety for HBES/BACS 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 exists 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 part of the EN 50491 series of standards. This European Standard does not provide functional safety requirements for safety-related systems.
Allgemeine Anforderungen an die Elektrische Systemtechnik für Heim und Gebäude (ESHG) und an Systeme der Gebäudeautomation (GA) - Teil 4-1: Anforderungen an die funktionale Sicherheit für Produkte, die für den Einbau in ESHG / GA vorgesehen sind
Exigences générales relatives aux systèmes électroniques pour les foyers domestiques et les bâtiments (HBES) et aux Systèmes de Gestion Technique du Bâtiment (SGTB) - Partie 4-1: Exigences générales de sécurité fonctionnelle pour les produits destinés à être intégrés dans les systèmes HBES/SGTB
La présente norme européenne détermine les exigences de sécurité fonctionnelle pour les produits et les systèmes HBES/SGTB, un système de bus multi-application où les fonctions sont décentralisées, distribuées et reliées par l'intermédiaire d'un processus commun de communication. Ces exigences peuvent également s'appliquer aux fonctions distribuées de tout matériel connecté dans un système de contrôle pour foyer domestique ou bâtiment, si aucune norme de sécurité fonctionnelle spécifique n'existe pour ce matériel ou système.
Les exigences de sécurité fonctionnelle de la présente norme européenne s'appliquent conjointement avec la norme de produit correspondante du dispositif s'il y a lieu.
La présente norme européenne fait partie de la série de norme EN 50491..
La présente norme européenne ne fournit pas d'exigences de sécurité fonctionnelle pour les systèmes relatifs à la sécurité.
Splošne zahteve za stanovanjske in stavbne elektronske sisteme (HBES) in stavbne sisteme avtomatizacije in nadzora (BACS) - 4-1. del: Zahteve splošne funkcionalne varnosti za proizvode, ki so namenjeni za vgradnjo v HBES in BACS
Ta evropski standard določa zahteve funkcionalne varnosti za stanovanjske in stavbne elektronske sisteme (HBES)/stavbne sisteme avtomatizacije in nadzora (BACS) ter z njimi povezane proizvode, tj. večaplikacijski sistem vodil, v katerem so funkcije decentralizirane, distribuirane in povezane prek skupnega komunikacijskega procesa. Zahteve se lahko uporabljajo tudi za porazdeljene funkcije katere koli opreme, priključene na stanovanjski ali stavbni sistem nadzora, če za to opremo ali sistem ne obstaja poseben standard za funkcionalno varnost. Zahteve funkcionalne varnosti iz tega evropskega standarda se uporabljajo skupaj z ustreznim standardom za napravo, če obstaja. Ta evropski standard je del skupine standardov EN 50491. Ta evropski standard ne določa zahtev funkcionalne varnosti za sisteme, povezane z varnostjo.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 50491-4-1:2012
01-maj-2012
1DGRPHãþD
SIST EN 50090-2-3:2005
Splošne zahteve za stanovanjske in stavbne elektronske sisteme (HBES) in
stavbne sisteme avtomatizacije in nadzora (BACS) - 4-1. del: Zahteve splošne
funkcionalne varnosti za proizvode, ki so namenjeni za vgradnjo v HBES in BACS
General requirements for Home and Building Electronic Systems, HBES and Building
Automation and Control Systems (BACS) - Part 4-1: General functional safety
requirements for products intended to be integrated in Building Electronic Systems
(HBES) and Building Automation and Control Systems (BACS)
Allgemeine Anforderungen an die Elektrische Systemtechnik für Heim und Gebäude
(ESHG) und an Systeme der Gebäudeautomation (GA) - Teil 4-1: Anforderungen an die
funktionale Sicherheit für Produkte, die für den Einbau in ESHG / GA vorgesehen sind
Exigences générales relatives aux systèmes électroniques pour les foyers domestiques
et les bâtiments (HBES) et aux Systèmes de Gestion Technique du Bâtiment (SGTB) -
Partie 4-1: Exigences générales de sécurité fonctionnelle pour les produits destinés à
être intégrés dans les systèmes HBES/SGTB
Ta slovenski standard je istoveten z: EN 50491-4-1:2012
ICS:
97.120 Avtomatske krmilne naprave Automatic controls for
za dom household use
SIST EN 50491-4-1:2012 en,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 50491-4-1:2012
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SIST EN 50491-4-1:2012
EUROPEAN STANDARD
EN 50491-4-1
NORME EUROPÉENNE
March 2012
EUROPÄISCHE NORM
ICS 97.120 Supersedes EN 50090-2-3:2005
English version
General requirements for Home and Building Electronic Systems (HBES)
and Building Automation and Control Systems (BACS) -
Part 4-1: General functional safety requirements for products intended to
be integrated in Building Electronic Systems (HBES) and Building
Automation and Control Systems (BACS)
Exigences générales relatives aux Allgemeine Anforderungen an die
systèmes électroniques pour les foyers Elektrische Systemtechnik für Heim und
domestiques et les bâtiments (HBES) et Gebäude (ESHG) und an Systeme der
aux Systèmes de Gestion Technique du Gebäudeautomation (GA) -
Bâtiment (SGTB) - Teil 4-1: Anforderungen an die funktionale
Partie 4-1: Exigences générales de Sicherheit für Produkte, die für den Einbau
sécurité fonctionnelle pour les produits in ESHG / GA vorgesehen sind
destinés à être intégrés dans les
systèmes HBES/SGTB
This European Standard was approved by CENELEC on 2012-02-20. 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 CEN-CENELEC Management Centre 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 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, 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.
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.
Ref. No. EN 50491-4-1:2012 E
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EN 50491-4-1:2012 – 2 –
Contents
Foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references. 5
3 Terms and definitions. 5
4 General requirements . 8
4.1 General . 8
4.2 Method of establishment for the requirements . 8
5 Requirements for functional safety . 10
5.1 General . 10
5.2 Power feeding . 10
5.3 Environment . 11
5.4 Life time . 11
5.5 Reasonably foreseeable misuse . 11
5.6 Software and communication . 12
5.7 Remote operations . 13
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 /BACS applications . 23
Bibliography . 25
Figure
Figure A.1 Risk reduction - General concept . 15
Tables
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
Table B.1 . 17
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Foreword
This document (EN 50491-4-1:2012) has been prepared by CLC/TC 205, "Home and Building Electronic
Systems (HBES)".
The following dates are fixed:
• latest date by which this document has to be
(dop) 2013-02-20
implemented at national level by publication of
an identical national standard or by
endorsement
• latest date by which the national standards
(dow) 2015-02-20
conflicting with this document have to
be withdrawn
This document supersedes EN 50090-2-3:2005.
EN 50491-4-1:2012 includes the following significant technical changes with respect to
EN 50090-2-3:2005:
- 3 Definitions
- 5.6 Software and communication
EN 50491-4-1 is part of the EN 50491 series, which comprises the following parts under the generic title
General requirements for Home and Building Electronic Systems (HBES) and Building Automation and
Control Systems (BACS):
- Part 1: General requirements
- Part 2: Environmental conditions
- Part 3: Electrical safety requirements
- Part 4-1: General functional safety requirements for products intended to be integrated in Building
Electronic Systems (HBES) and Building Automation and Control Systems (BACS)
- Part 5-1: EMC requirements, conditions and test set-up
- Part 5-2: EMC requirements for HBES/BACS used in residential, commercial and light industry
environment
- Part 5-3: EMC requirements for HBES/BACS used in industry environment
- Part 6-1: HBES installations Installation and planning
- Part 6-3 HBES installations Assessment and definition of levels [Technical Report]
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such patent rights.
This standard covers the Principle Elements of the Safety Objectives for Electrical Equipment Designed for
Use within Certain Voltage Limits (LVD - 2006/95/EC)
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EN 50491-4-1:2012 – 4 –
Introduction
Homes buildings and similar environments require various electronic devices for several application. These
devices when linked via a digital transmission network are called Home and Building Electronic System
(HBES) or Building Automation and Control System (BACS).
Examples of HBES/BACS applications are the management, of lighting, heating, energy water, fire alarms,
blinds, different forms of security, etc.
A HBES/BACS network may be based on different communication media as power line, twisted pair, coax
cable, radio frequency or infrared and may be connected to external networks like telephone, broad band,
television, power supply networks and alarm networks.
Several standards of this series serve to implement public interest matters, primarily as reflected in European
Commission Directives.
HBES/BACS products integrated in a HBES/BACS should be safe for the use in intended applications.
This European Standard specifies the general functional safety requirements for HBES/BACS following the
principles of the basic standard for functional safety EN 61508.
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/BACS products in there life cycle.
This European Standard only addresses HBES/BACS products.
This European Standard is addressed to committees that develop or modify HBES /BACS product/system
standards or, where no suitable HBES/BACS product standards addressing functional safety exist, to
product manufacturers.
HBES/BACS products in this European Standard are for non-safety related applications. Additional
requirements for safety related HBES/BACS according to EN 61508 will be defined in part 4-2 of the
EN 50491 series.
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1 Scope
This European Standard sets the requirements for functional safety for HBES/BACS 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 exists 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 part of the EN 50491 series of standards.
This European Standard does not provide functional safety requirements for safety-related systems.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
EN 50491-2 General requirements for Home and Building Electronic Systems (HBES) and
Building Automation and Control Systems (BACS) Part 2: Environmental
conditions
EN 50491-3 General requirements for Home and Building Electronic Systems (HBES) and
Building Automation and Control Systems (BACS) Part 3: Electrical safety
requirements
EN 50491-5 (all parts) General requirements for Home and Building Electronic Systems (HBES) and
Building Automation and Control Systems (BACS)
EN 61508 (all parts) Functional safety of electrical/electronic/programmable electronic safety-related
systems
EN 61709:1998 Electronic components Reliability Reference conditions for failure rates and
stress models for conversion (IEC 61709:1996)
EN ISO 9000 Quality management systems Fundamentals and vocabulary (ISO 9000)
3 Terms and 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
[SOURCE: EN 61508-4:2010, definition 3.3.4]
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
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EN 50491-4-1:2012 – 6 –
3.4
disturbed communication
communication in which 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/BACS, including that resulting
from:
1) normal operation,
2) reasonably foreseeable misuse,
3) failure,
4) temporary disturbances
Note 1 to entry: functional safety: part of the overall safety relating to the EUC and the EUC control system that depends on the correct
functioning of the E/E/PE safety-related systems and other risk reduction measures [SOURCE: EN 61508-4:2010, definition 3.1.12]
Note 2 to entry: Definition of IEC/TR 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
Note 1 to entry: harm: physical injury or damage to the health of people or damage to property or the environment [SOURCE:
EN 61508-4:2010, 3.1.1]
3.8
hazard
potential source of harm
[SOURCE: ISO/IEC Guide 51:1999, definition 3.5]
[SOURCE: EN 61508-4:2010, definition 3.1.2]
Note 1 to entry: 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).
3.9
hazardous event
situation which results in harm on normal operation or abnormal condition
Note 1 to entry: Whether or not a hazardous event results in harm depends on whether people, property or the environment are
exposed to the consequence of the hazardous event and, in the case of harm to people, whether any such exposed people can escape
the consequences of the event after it has occurred.
Note 2 to entry: Adapted from EN 61508-4:2010,definition 3.1.4.
3.10
HBES/BACS Home and Building Electronic Systems
multi-application bus system where the functions are decentrally distributed and linked through a common
communication process
Note 1 to entry: 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/BACS product
product consisting of devices in the form of hardware, firmware, their associated software and configuration
tools, intended to be used in an HBES/BACS
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3.12
product
device in the form of hardware, firmware, their associated software and configuration tools
3.13
product documentation
manufacturer's installation and operations literature as manufacturer's catalogue, leaflet and other printed or
electronic product information
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 and other technology risk
reduction measures, the necessary safety integrity for the required safety functions
Note 1 to entry: The term refers to those systems, designated as safety-related systems, that are intended to achieve, together with the
other risk reduction measures, the necessary risk reduction in order to meet the required tolerable risk.
Note 2 to entry: Safety-related systems are designed to prevent the EUC from going into a dangerous state by taking appropriate action
on detection of a condition which may lead to a hazardous event. The failure of a safety-related system would be included in the events
leading to the determined hazard or hazards. Although there may be other systems having safety functions, it is the safety-related
systems that have been designated to achieve, in their own right, the required tolerable risk. Safety-related systems can broadly be
divided into safety-related control systems and safety-related protection systems.
Note 3 to entry: Safety-related systems may be an integral part of the EUC control system or may interface with the EUC by sensors
and/or actuators. That is, the required safety integrity level may be achieved by implementing the safety functions in the EUC control
system (and possibly by additional separate and independent systems as well) or the safety functions may be implemented by separate
and independent systems dedicated to safety.
Note 4 to entry: A safety-related system may:
a) be designed to prevent the hazardous event (i.e. if the safety-related systems perform their safety functions then no harmful event
arises);
b) be designed to mitigate the effects of the harmful event, thereby reducing the risk by reducing the consequences;
c) be designed to achieve a combination of a) and b).
Note 5 to entry: A person can be part of a safety-related system. For example, a person could receive information from a programmable
electronic device and perform a safety action based on this information, or perform a safety action through a programmable electronic
device.
Note 6 to entry: A safety-related system includes all the hardware, software and supporting services (for example, power supplies)
necessary to carry out the specified safety function (sensors, other input devices, final elements (actuators) and other output devices
are therefore included in the safety-related system).
Note 7 to entry: A safety-related system may be based on a wide range of technologies including electrical, electronic, programmable
electronic, hydraulic and pneumatic.
3.15
risk
combination of the probability of occurrence of a harm and the severity of that harm
Note 1 to entry: For more discussion on this concept see Annex A of EN 61508-5:2010.
[SOURCE: EN 61508-4:2010, definition 3.1.6]
3.16
reasonably foreseeable misuse
use of a product, process or service in a way not intended by the supplier, but which may result from readily
predictable human behaviour
[SOURCE: EN 61508-4:2010, definition 3.1.14, ISO/IEC Guide 51:1999, definition 3.14]
3.17
safety function
function to be implemented by an E/E/PE safety-related system or other risk reduction measures, that is
intended to achieve or maintain a safe state for the EUC, in respect of a specific hazardous event
EXAMPLE Examples of safety functions include:
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EN 50491-4-1:2012 – 8 –
– functions that are required to be carried out as positive actions to avoid hazardous situations (for example switching off a motor); and
– functions that prevent actions being taken (for example preventing a motor starting).
[SOURCE: EN 61508-4:2010, definition 3.5.1]
3.18
EUC
Equipment Under Control
[SOURCE: EN 61508-4:2010, Table 1]
4 General requirements
4.1 General
Functional safety of a system relies upon both the performance of the network, and upon the performance of
the connected HBES /BACS products:
1) failure of either the network or any other part of HBES /BACS system shall not cause the system, the
products, or the controlled equipment to become unsafe;
2) whilst in operation, individual HBES /BACS products shall not rely solely upon the system for their safe
operation;
3) while in operation, the systems interaction of any product(s) with any other product(s) shall not result in
unsafe operation of the system.
4.2 Method of establishment for the requirements
4.2.1 General
For specification of the functional safety requirements the life-cycle used in EN 61508 was followed:
1) concept phase of products;
2) application environment;
3) identification of hazards and hazard events;
4) hazard and risk analysis, risk reduction measures;
5) realisation of risk reduction measures;
6) validation;
7) maintenance;
8) installation and commissioning;
9) decommissioning.
The Product Technical Committees and/or developers shall take the requirements of this European Standard
into account in the product safety requirements, but it is not necessary to go into the EN 61508 process itself.
4.2.2 HBES/BACS application environment
The HBES/BACS application environment is taken into account.
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4.2.3 Sources of hazards
The following sources of hazards have been considered:
1) material and construction;
2) reliability;
3) normal operation;
4) unintentional interaction with other products;
5) interaction with other HBES/BACS products;
6) abnormal conditions;
7) foreseeable misuse, including the download of unauthorised and malicious code;
NOTE This includes unintentional software modifications.
8) life time;
9) environment.
4.2.4 Hazardous events
The following hazardous events have been taken into account for the analysis (the bus and mains
(230 V/400 V) have been considered):
1) power failure;
2) short circuit of bus line;
3) overvoltage on the bus line;
4) overvoltage on the mains;
5) insulation damage (temperature, surge, mechanical);
6) wrong connection;
7) over temperature;
8) fire;
9) mechanical shock, vibration;
10) corrosion;
11) electromagnetic disturbance;
12) disturbed communication;
13) pollution;
14) end of life time of a component/products;
15) reasonably foreseeable misuse;
16) software failure;
17) overload;
18) loss of reliability;
19) breakdown of material (mechanically);
20) inappropriate design/construction;
21) switching of damaged equipment and subsystems;
22) remote control;
23) command from two sources to one product (e.g. actuator);
24) system failures.
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EN 50491-4-1:2012 – 10 –
4.2.5 Derivation of requirements
The risk analysis has been carried out for each of the hazard events; see Annex B. The likelihood of the
event has been estimated and the risk class has been taken in account according to the method of Annex A.
In all cases where the evaluated risk classes indicate an unacceptable risk, risk reduction measures are
requested as well as the level of risk reduction effect and its validation. Some risk reduction measures are
proposed and what is usually covered by the relevant product standard is also indicated. If manufacturers
intend to develop HBES/BACS products/systems which exhibit hazardous events not covered by 4.2.4 the
risk analysis shall be carried out according to EN 61508.
5 Requirements for functional safety
NOTE Reference to the hazardous events of 4.2.4 are given within brackets ( ).
5.1 General
Analysis according to EN 61508 indicates that functional safety depends upon both the design and
manufacture of products and upon the appropriate use of the products in installations.
5.2 to 5.7 contain requirements for HBES/BACS products and for the provision of information necessary for
the proper installation, operation and maintenance of these products.
Compliance requirements are given for the products as necessary and verification of the provision of the
necessary information.
All referenced product tests are type tests.
The basis and reasons of the following requirements are shown in Annex B.
5.2 Power feeding
5.2.1 In case of power failure the products shall restart safely when power is restored. (1)
NOTE Safe restart can be performed by
– storing the status information and usage the information for rebuilding the functionality after power on,
– switching to a defined state of the product depending on the application of the products,
– calculation of the safe state based on the information available from the system (from a controller, if any and/or from each product),
– maintaining a sufficient power reserve (by providing an appropriate buffer time either in the product and/or in the Power Supply Unit)
to enable connected products to assume a safe state.
5.2.2 Marking and instructions of the products shall be designed to prevent the risk of wrong connections.
(3) (6)
The products shall be marked in a legible and durable manner.
Compliance shall be checked by inspection of the product documentation and if appropriate according to the
test of legible and durable markings in the relevant product standard.
5.2.3 The construction and design of a product shall prevent wrong connections. This may be supported
by appropriate grouping of connections. (6)
Compliance shall be checked by inspection of the product.
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5.3 Environment
5.3.1 Products shall be designed for the working temperature appropriate to their maximum rated voltages
needed for the application environment and shall work properly in the specified temperature range. (7)
Compliance shall be checked by testing the product according to the relevant product standard and if this
does not exist to EN 50491-2 and the relevant basic safety standards.
5.3.2 The products and components shall be designed for resistance to abnormal heat and shall not
propagate fire. (8)
Compliance shall be checked by testing the product according to the relevant product standard and if this
does not exist to the relevant basic safety standards.
5.3.3 The products shall be designed to withstand the mechanical stress appropriate to the application(s).
(9)
Compliance shall be checked by testing the product according to the relevant product standard and if this
does not exist to EN 50491-2 and the relevant basic safety standards.
5.4 Life time
The products shall be designed for a defined useful lifetime according to EN 61709:1998, 5.2 and Annex A
or defined number of switching cycles under normal condition.
The datasheet shall give instructions for maintenance if required to reach the specified lifetime. (14)
Compliance shall be checked by inspection of the documentation.
5.5 Reasonably foreseeable misuse
5.5.1 The risk of accidental download of the wrong application software or parameters into the products
shall be minimised. (15)
NOTE The following measures may apply:
– design of the configuration tool;
– identification of products and comparison of their profiles by the network management;
– password;
– authentication;
– product documentation;
– training of installers/operators.
Compliance shall be checked by product test and/or inspection of the product documentation.
5.5.2 Proper configuration and related parameters shall be ensured. (15)
NOTE The following measures may apply:
– specification of parameter ranges;
– limited configuration possibilities for the end-user;
– access to configuration only for skilled persons (see EN 50090-2-1);
– consistency check by tools or by the installer;
– check of conformity with configuration.
Compliance shall be checked by check of conformity of existing with planed (intended) configuration.
5
...
SLOVENSKI STANDARD
oSIST prEN 50491-4-1:2011
01-maj-2011
1DGRPHãþD
SIST EN 50090-2-3:2005
Splošne zahteve za stanovanjske in stavbne elektronske sisteme (HBES) in
stavbne sisteme avtomatizacije in nadzora (BACS) - 4-1. del: Sistemski pregled -
Zahteve splošne funkcionalne varnosti za proizvode, ki so namenjeni za vgradnjo
v HBES in BACS
General requirements for Home and Building Electronic Systems, HBES and Building
Automation and Control Systems (BACS) - Part 4-1: General functional safety
requirements for products intended to be integrated in Building Electronic Systems
(HBES) and Building Automation and Control Systems (BACS)
Allgemeine Anforderungen an die Elektrische Systemtechnik für Heim und Gebäude
(ESHG) und an Systeme der Gebäudeautomation (GA) - Teil 4-1: Anforderungen an die
funktionale Sicherheit für Produkte, die für den Einbau in ESHG / GA vorgesehen sind
Exigences générales relatives aux systèmes électroniques pour les foyers domestiques
et les bâtiments (HBES) et aux Systèmes de Gestion Technique du Bâtiment (SGTB) -
Partie 4-1: Exigences générales de sécurité fonctionnelle pour les produits destinés à
être intégrés dans les systèmes HBES/SGTB
Ta slovenski standard je istoveten z: prEN 50491-4-1:2011
ICS:
97.120 Avtomatske krmilne naprave Automatic controls for
za dom household use
oSIST prEN 50491-4-1:2011 en,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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oSIST prEN 50491-4-1:2011
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oSIST prEN 50491-4-1:2011
DRAFT
EUROPEAN STANDARD
prEN 50491-4-1
NORME EUROPÉENNE
February 2011
EUROPÄISCHE NORM
ICS 97.120 Will supersede EN 50090-2-3:2005
English version
General requirements for Home and Building Electronic Systems, HBES
and Building Automation and Control Systems (BACS) -
Part 4-1: General functional safety requirements for products intended to
be integrated in Building Electronic Systems (HBES) and Building
Automation and Control Systems (BACS)
Exigences générales relatives aux systèmes Allgemeine Anforderungen an die Elektrische
électroniques pour les foyers domestiques et les Systemtechnik für Heim und Gebäude (ESHG)
bâtiments (HBES) et aux Systèmes de Gestion und an Systeme der Gebäudeautomation (GA) -
Technique du Bâtiment (SGTB) - Teil 4-1: Anforderungen an die funktionale
Partie 4-1: Exigences générales de sécurité Sicherheit für Produkte, die für den Einbau in
fonctionnelle pour les produits destinés à être ESHG / GA vorgesehen sind
intégrés dans les systèmes HBES/SGTB
This draft European Standard is submitted to CENELEC members for CENELEC enquiry.
Deadline for CENELEC: 2011-07-22.
It has been drawn up by CLC/TC 205.
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 Central Secretariat 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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy,
Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia,
Spain, Sweden, Switzerland 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
© 2011 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Project: 23184 Ref. No. prEN 50491-4-1:2011 E
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prEN 50491-4-1:2011 – 2 –
1 Foreword
2 This draft European Standard has been prepared by the Technical Committee CENELEC TC 205, Home and
3 Building Electronic Systems (HBES). It is submitted to the CENELEC enquiry.
4 This document will supersede EN 50090-2-3:2005.
5 EN 50491-4-1 is part of the EN 50491 series, which will comprise the following parts under the generic title
6 General requirements for Home and Building Electronic Systems (HBES) and Building Automation and
7 Control Systems (BACS):
8 - Part 1: general requirements and overview
9 - Part 2: Environmental conditions
10 - Part 3: Electrical Safety requirements
11 - Part 4-1: General functional safety requirements for products intended to be integrated in Building
12 Electronic Systems (HBES) and Building Automation and Control Systems (BACS)
13 - Part 5-1: EMC requirements, conditions and test set-up
14 - Part 5-2: EMC requirements for HBES/BACS used in residential, commercial and light industry
15 environment
16 - Part 5-3: EMC requirements for HBES/BACS used in industry environment
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17 Contents
18 Introduction . 4
19 1 Scope . 5
20 2 Normative references . 5
21 3 Definitions . 5
22 4 General requirements . 8
23 4.1 General . 8
24 4.2 Method of establishment for the requirements . 8
25 5 Requirements for functional safety . 10
26 5.1 General . 10
27 5.2 Power feeding . 10
28 5.3 Environment . 11
29 5.4 Life time . 11
30 5.5 Reasonably foreseeable misuse . 11
31 5.6 Software and communication . 12
32 5.7 Remote operations . 13
33 Annex A (informative) Example of a method for the determination of safety integrity levels . 15
34 Annex B (informative) Hazards and development of necessary functional safety requirements 17
35 Annex C (informative) Some examples of non safety related HBES /BACS applications . 23
36 Bibliography . 25
37 Figure
38 Figure A.1 - Risk reduction - General concept . 15
39 Tables
40 Table 1 – Requirements for avoiding inadvertent operations and possible ways to achieve them. 14
41 Table A.1 – Example of risk classification of accidents . 16
42 Table A.2 – Interpretation of risk classes . 16
43
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prEN 50491-4-1:2011 – 4 –
44 Introduction
45 Homes buildings and similar environments require various electronic devices for several application. These
46 devices when linked via a digital transmission network are called Home and Building Electronic System,
47 (HBES) or Building automation controll system (BACS).
48 Examples of HBES /BACS /BACS applications are the management, of lighting, heating, energy water , fire
49 alarms, blinds , different forms of security , etc.
50 A HBES /BACS network may be based on different communication media as power line, twisted pair, coax
51 cable, radio frequency or infrared and may be connected to external networks like telephone, broad band,
52 television, power supply networks and alarm networks.
53 Several standards of this series serve to implement public interest matters, primarily as reflected in European
54 Commission Directives.
55 HBES products integrated in a HBES /BACS should be safe for the use in intended applications.
56 This European Standard specifies the general functional safety requirements for HBES /BACS following the
57 principles of the basic standard for functional safety EN 61508 and Technical Report R205-012 in particular.
58 This European Standard identifies functional safety issues related to products and their installation. The
59 requirements are based on a risk analysis in accordance with EN 61508.
60 The intention of this European Standard is to allocate, as far as possible, all safety requirements for HBES
61 /BACS products in there life cycle.
62 This European Standard only addresses HBES /BACS /BACS products.
63 This European Standard is addressed to committees that develops or modify HBES /BACS product/system
64 standards or, where not suitable HBES /BACS product standards addressing functional safety exist, to
65 product manufacturer.
66 HBES /BACS products in this European Standard are for non-safety related applications. Additional
67 requirements for safety related HBES /BACS will be described, according to EN 61508, in Part 4-1 of the
68 EN 50491 series (under consideration).
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69 1 Scope
70 This European Standard sets the requirements for functional safety for HBES /BACS products and systems,
71 a multi-application bus system where the functions are decentralised, distributed and linked through a
72 common communication process. The requirements may also apply to the distributed functions of any
73 equipment connected in a home or building control system if no specific functional safety standard exist for
74 this equipment or system.
75 The functional safety requirements of this European Standard apply together with the relevant product
76 standard for the device if any.
77 This European Standard is used as a product family standard. It is not intended to be used as a stand-alone
78 standard.
79 This European Standard does not provide functional safety requirements for safety-related systems.
80 2 Normative references
81 The following referenced documents are indispensable for the application of this document. For dated
82 references, only the edition cited applies. For undated references, the latest edition of the referenced
83 document (including any amendments) applies.
84 EN 50491-3 General requirements for Home and Building Electronic Systems (HBES) and
85 Building Automation and Control Systems (BACS) - Part 3: Electrical safety
86 requirements
87 EN 61508-4:2001 Functional safety of electrical/electronic/programmable electronic safety-related
88 systems – Part 4: Definitions and abbreviations
89 (IEC 61508-4:1998 + corrigendum 1999)
90 EN 61508-5:2001 Functional safety of electrical/electronic/programmable electronic safety-related
91 systems – Part 5: Examples of methods for the determination of safety integrity
92 levels (IEC 61508-5:1998 + corrigendum 1999)
93 EN 61709:1998 Electronic components - Reliability - Reference conditions for failure rates and stress
94 models for conversion (IEC 61709:1996)
95 CEN/CLC Guide 9 Guidelines for the inclusion of safety aspects in standards (ISO/IEC Guide 51)
96 EN ISO 9000 series Quality management systems (9000 series)
97 3 Definitions
98 For the purposes of this document, the following terms and definitions apply.
99 3.1
100 architecture
101 specific configuration of hardware and software elements in a system
102 [EN 61508-4:2001, definition 3.3.5]
103 3.2
104 authentication
105 means for certifying that the entity sending a message is what or who it purports to be and confirmation that
106 the message is identical to that which was sent
107 3.3
108 authorisation
109 mechanism to ensure that the entity or person accessing information, functions or services has the authority
110 to do so
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111 3.4
112 disturbed communication
113 where for any reason a message being communicated is incomplete, truncated, contains errors or has the
114 correct format but delivers information which is outside the range of expected parameters for such a
115 message
116 3.5
117 functional safety
118 freedom from unacceptable risk of harm due to the operation of an HBES /BACS , including that resulting
119 from
120 1) normal operation,
121 2) reasonably foreseeable misuse,
122 3) failure,
123 4) temporary disturbances
124 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
125 control system which depends on the correct functioning of the Electrical/Electronic/Programmable Electronic (E/E/PE) safety related
126 systems, other technology safety related systems and external risk reduction facilities.
127 NOTE 2 Definition of IEC TR 61000-2-1 and IEC TS 61000-1-2 (IEC/TC 77) are taken into account.
128 3.6
129 Hamming distance
130 numbers of bits in which two binary codes differ
131 3.7
132 harm
133 physical injury or damage to the health of people either directly or indirectly as a result of damage to property
134 or to the environment
135 [EN 61508-4:2001, definition 3.1.1]
136 3.8
137 hazard
138 a potential source of harm
139 [CEN/CLC Guide 9, respectively ISO/IEC Guide 51:1990]
140 NOTE The term includes danger to persons arising within a short time scale (for example, fire and explosion) and also those that
141 have a long-term effect on a person’s health (for example, release of a toxic substance).
142 [EN 61508-4:2001, definition 3.1.2]
143 3.9
144 hazardous event
145 situation which results in harm on normal operation or abnormal condition
146 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
147 3.10
148 HBES /BACS Home and Building Electronic Systems
149 a multi-application bus system where the functions are decentrally distributed and linked through a common
150 communication process
151 NOTE HBES is used in homes and buildings plus their surroundings. Functions of the system are e.g: switching, open loop controlling,
152 closed loop controlling, monitoring and supervising.
153 3.11
154 HBES /BACS product
155 products consist of devices in the form of hardware, firmware, their associated software and configuration
156 tools, intended to be used in an HBES /BACS
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157 3.12
158 product
159 devices in the form of hardware, firmware, their associated software and configuration tools
160 3.13
161 product documentation
162 – the manufacturer's installation and operations literature
163 – as manufacturer's catalogue, leaflet and other printed or electronic product information
164
165 3.14
166 safety related system
167 designated system that both
168 – implements the required safety functions necessary to achieve or maintain a safe state for the EUC, and
169 – is intended to achieve on its own or with other E/E/PE safety related systems, other technology safety-
170 related systems or external risk reduction facilities, the necessary safety integrity for the required safety
171 functions.
172 NOTE 1 The term refers to those systems, designated as safety-related systems, that are intended to achieve, together with the
173 external risk reduction facilities (see EN 61508-4:2001, definition 3.4.3), the necessary risk reduction in order to meet the required
174 tolerable risk (see EN 61508-4:2001, definition 3.1.6). See also Annex A of EN 61508-5:2001.
175 NOTE 2 The safety-related systems are designed to prevent the EUC from going into a dangerous state by taking appropriate action
176 on receipt of commands. The failure of a safety-related system would be included in the events leading to the determined hazard or
177 hazards. Although there may be other systems having safety functions, it is the safety-related systems that have been designated to
178 achieve, in their own right, the required tolerable risk. Safety-related systems can broadly be divided into safety-related control systems
179 and safety-related protection systems, and have two modes of operation (EN 61508-4:2001, definition 3.5.12).
180 NOTE 3 Safety-related systems may be an integral part of the EUC control system or may interface with the EUC by sensors and/or
181 actuators. That is, the required safety integrity level may be achieved by implementing the safety functions in the EUC control system
182 (and possibly by additional separate and independent systems as well) or the safety functions may be implemented by separate and
183 independent systems dedicated to safety.
184 NOTE 4 A safety-related system may
185 a) be designed to prevent the hazardous event (i.e. if the safety-related systems perform their safety functions then no hazardous
186 event arises),
187 b) be designed to mitigate the effects of the hazardous event, thereby reducing the risk by reducing the consequences,
188 c) be designed to achieve a combination of a) and b).
189 NOTE 5 A person can be part of a safety-related system (EN 61508-4:2001, definition 3.3.1). For example, a person could receive
190 information from a programmable electronic device and perform a safety action based on this information, or perform a safety action
191 through a programmable electronic device.
192 NOTE 6 The term includes all the hardware, software and supporting services (for example, power supplies) necessary to carry out
193 the specified safety function (sensors, other input devices, final elements (actuators) and other output devices are therefore included in
194 the safety-related system).
195 NOTE 7 A safety-related system may be based on a wide range of technologies including electrical, electronic, programmable
196 electronic, hydraulic and pneumatic.
197 [EN 61508-4:2001, definition 3.4.1]
198 3.15
199 risk
200 combination of the probability of occurrence of a harm and the severity of that harm
201 [CEN/CLC Guide 9, respectively ISO/IEC Guide 51:1990, modified]
202 [EN 61508-4:2001, definition 3.1.5]
203 NOTE For risk classes see Annex A.
204 3.16
205 reasonably foreseeable misuse
206 the use of a product, process or service under conditions or for purposes not intended by the supplier, but
207 which may happen, induced by the product, process or service in combination with, or as result of, common
208 human behaviour
209 [EN 61508-4:2001, definition 3.1.11]
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210 3.17
211 safety function
212 function to be implemented by an E/E/PE safety related system, other technology safety-related systems or
213 external risk reduction facilities, which is intended to achieve and maintain a safe state for the EUC, in
214 respect of a specific hazardous event (see EN 61508-4:2001, definition 3.4.1)
215 [EN 61508-4:2001, definition 3.5.1]
216 4 General requirements
217 4.1 General
218 Functional safety of a system relies upon both the performance of the network, and upon the performance of
219 the connected HBES /BACS products:
220 1) failure of either the network or any other part of HBES /BACS system shall not cause the system, the
221 products, or the controlled equipment to become unsafe;
222 2) whilst in operation, individual HBES /BACS products shall not rely solely upon the system for their safe
223 operation;
224 3) while in operation, the systems interaction of any product(s) with any other product(s) shall not result in
225 unsafe operation of the system.
226 4.2 Method of establishment for the requirements
227 For specification of the functional safety requirements the life-cycle used in EN 61508 was followed:
228 1) concept phase of products;
229 2) application environment;
230 3) identification of hazards and hazard events;
231 4) hazard and risk analysis, risk reduction measures;
232 5) realisation of risk reduction measures;
233 6) validation;
234 7) maintenance;
235 8) installation and commissioning;
236 9) decommissioning.
237 The Product Technical Committees and/or developers shall take the requirements of this European Standard
238 into account in the product safety requirements, but it is not necessary to go into the EN 61508 process itself.
239 4.2.1 HBES application environment
240 The HBES /BACS application environment is taken into account.
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241 4.2.2 Sources of hazards
242 The following sources of hazards have been considered:
243 1) material and construction;
244 2) reliability;
245 3) normal operation;
246 4) unintentional interaction with other products;
247 5) interaction with other HBES /BACS products;
248 6) abnormal conditions;
249 7) foreseeable misuse, including the download of unauthorised and malicious code;
250 NOTE This includes unintentional software modifications.
251 8) life time;
252 9) environment.
253 4.2.3 Hazardous events
254 The following hazardous events have been taken into account for the analysis (the bus and mains (230
255 V/400 V) have been considered):
256 1) power failure;
257 2) short circuit of bus line;
258 3) overvoltage on the bus line;
259 4) overvoltage on the mains;
260 5) insulation damage (temperature, surge, mechanical);
261 6) wrong connection;
262 7) over temperature;
263 8) fire;
264 9) mechanical shock, vibration;
265 10) corrosion;
266 11) electromagnetic disturbance;
267 12) disturbed communication;
268 13) pollution;
269 14) end of life time of a component/products;
270 15) reasonably foreseeable misuse;
271 16) software failure;
272 17) overload;
273 18) loss of reliability;
274 19) breakdown of material (mechanically);
275 20) inappropriate design/construction;
276 21) switching of damaged equipment and subsystems;
277 22) remote control;
278 23) command from two sources to one product (e.g. actuator);
279 24) system failures.
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280 4.2.4 Derivation of requirements
281 The risk analysis has been carried out for each of the hazard events; see Annex B. The likelihood of the
282 event has been estimated and the risk class has been taken in account according to the method of Annex A.
283 In all cases where the evaluated risk classes indicate an unacceptable risk, risk reduction measures are
284 requested as well as the level of risk reduction effect and its validation. Some risk reduction measures are
285 proposed and what is usually covered by the relevant product standard is also indicated. If manufacturers
286 intend to develop HBES /BACS products/systems which exhibit hazardous events not covered by 4.2.3 the
287 risk analysis shall be carried out according to EN 61508.
288 5 Requirements for functional safety
289 NOTE Reference to the hazardous events of 4.2.3 are given within brackets ( ).
290 5.1 General
291 Analysis according to EN 61508 indicates that functional safety depends upon both the design and
292 manufacture of products and upon the appropriate use of the products in installations.
293 Subclauses 5.2 to 5.7 contain requirements for HBES /BACS products and for the provision of information
294 necessary for the proper installation, operation and maintenance of these products.
295 Compliance requirements are given for the products as necessary and verification of the provision of the
296 necessary information.
297 All referenced product tests are type tests.
298 The basis and reasons of the following requirements are shown in the Annex B.
299 5.2 Power feeding
300 5.2.1 In case of power failure the products shall restart safely when power is restored. (1)
301 NOTE Safe restart can be performed by
302 – storing the status information and usage the information for rebuilding the functionality after power on,
303 – switching to a defined state of the product depending on the application of the products,
304 – calculation of the safe state based on the information available from the system (from a controller, if any and/or from each product),
305 – maintaining a sufficient power reserve (by providing an appropriate buffer time either in the product and/or in the Power Supply Unit)
306 to enable connected products to assume a safe state.
307 5.2.2 Marking and instructions of the products shall be designed to prevent the risk of wrong connections.
308 (3) (6)
309 The products shall be marked in a legible and durable manner.
310 Compliance shall be checked by inspection of the product documentation and if appropriate according to the
311 test of legible and durable markings in the relevant product standard.
312 5.2.3 The construction and design of a product shall prevent wrong connections. This may be supported
313 by appropriate grouping of connections. (6)
314 Compliance shall be checked by inspection of the product.
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315 5.3 Environment
316 5.3.1 Products shall be designed for the working temperature appropriate to their maximum rated voltages
317 needed for the application environment and shall work properly in the specified temperature range. (7)
318 Compliance shall be checked by testing the product according to the relevant product standard and if this
319 does not exist to EN 50491-3 and the relevant basic safety standards.
320 5.3.2 The products and components shall be designed for resistance to abnormal heat and shall not
321 propagate fire. (8)
322 Compliance shall be checked by testing the product according to the relevant product standard and if this
323 does not exist to the relevant basic safety standards.
324 5.3.3 The products shall be designed to withstand the mechanical stress appropriate to the application(s).
325 (9)
326 Compliance shall be checked by testing the product according to the relevant product standard and if this
327 does not exist to EN 50491-3 and the relevant basic safety standards.
328 5.4 Life time
329 The products shall be designed for a defined useful lifetime according to EN 61709:1998, 5.2 and Annex A
330 or defined number of switching cycles under normal condition.
331 The Datasheet shall give instructions for maintenance if required to reach the specified lifetime. (14)
332 Compliance shall be checked by inspection of the documentation.
333 5.5 Reasonably foreseeable misuse
334 5.5.1 The risk of accidental download of the wrong application software or parameters into the products
335 shall be minimised. (15)
336 NOTE The following measures may apply:
337 – design of the configuration tool;
338 – identification of products and comparison of their profiles by the network management;
339 – password;
340 – authentication;
341 – product documentation;
342 – training of installers/operators.
343 Compliance shall be checked by product test and/or inspection of the product documentation.
344 5.5.2 Proper configuration and related parameters shall be ensured. (15)
345 NOTE The following measures may apply:
346 – specification of parameter ranges;
347 – limited configuration possibilities for the end-user;
348 – access to configuration only for skilled persons (see EN 50090-2-1);
349 – consistency check by tools or by the installer;
350 – check of conformity with configuration.
351 Compliance shall be checked by check of conformity of existing with planed (intended) configuration.
352
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