BS-EN-12675-2001.pdf

| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS EN 12675:2001 The European Standard EN 12675:2000 has the status of a British Standard ICS 93.080.30 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Traffic signal controllers Ð Functional safety requirements This British Standard, having been prepared under the direction of the Electrotechnical Sector Committee, was published under the authority of the Standards Committee and comes into effect on 15 February 2001 BSI 02-2001 ISBN 0 580 36886 6 BS EN 12675:2001 Amendments issued since publication Amd. No.DateComments National foreword This British Standard is the official English language version of EN 12675:2000. The UK participation in its preparation was entrusted to Technical Committee EPL/526, Road traffic control signals, which has the responsibility to: Ð aid enquirers to understand the text; Ð present to the responsible European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; Ð monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this committee can be obtained on request to its secretary. This standard contains a number of performance criteria which are defined by the selection of a class. This procedure has been adopted to enable European members to select a class that meets the regulatory requirements of the member. Performance classes for application in the UK are contained in ªTraffic Signs Regulations and General Directionsº (TSRG), published by The Stationery Office. Advice should be sought from The Department of the Environment, Transport and the Regions when selecting classes. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled ªInternational Standards Correspondence Indexº, or by using the ªFindº facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 16, an inside back cover and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM EN 12675 October 2000 ICS 93.080.30 English version Traffic signal controllers Functional safety requirements Contrôleurs de signaux de circulation routière Exigences de sécurité fonctionnelle Steuergeräte für Lichtsignalanlagen Funktionale Sicherheitsanforderungen This European Standard was approved by CEN on 9 March 2000. CEN 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 CEN 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 CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG Central Secretariat: rue de Stassart, 36 B-1050 Brussels © 2000 CENAll rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12675:2000 E Page 2 EN 12675:2000 © BSI 02-2001 Contents Page Foreword2 Introduction .2 1 Scope3 2 Normative references3 3 Definitions3 4 Functional safety requirements.6 5 Fault condition.12 6 User documentation13 7 Marking and labelling14 Annex ZB (informative) A-type national deviation15 Foreword This European Standard has been prepared by Technical Committee CEN/TC 226, Road equipment, the Secretariat of which is held by AFNOR. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by April 2001, and conflicting national standards shall be withdrawn at the latest by April 2001. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Introduction The objective of this European Standard is to specify the functional safety requirements of equipment used for the control of traffic signals. It relates to the control of signals to traffic, and any associated signalled traffic movements. The primary concern is to safeguard persons and objects against hazards due to conflicting signals to traffic. The hazards to be considered include, but are not limited to, the following types of possible signal failures: a) the failure to display a red signal to traffic; b) the display of a green signal to conflicting traffic; c) the failure to display the correct signal sequence to traffic; d) the failure to provide the correct timing of all signals. Persons to be safeguarded are: a) users of traffic signals, drivers and passengers of vehicles (including public transport), pedestrians, cyclists and equestrians, persons with physical disabilities; b) maintenance and inspection personnel. Page 3 EN 12675:2000 © BSI 02-2001 1 Scope This European Standard specifies the functional safety requirements for traffic signal controllers. It is applicable to traffic signal control equipment permanently and temporarily installed, but excludes portable traffic control equipment. Traffic signal controllers, as defined by this European Standard, are required to control conflicting traffic, both vehicular and pedestrian, e.g. junction signals, pedestrian crossings, shuttle signals, public transport signals, in a safe manner. The electrical safety requirements and additional traffic safety requirements, the interfacing with external equipment and the test methods for verifying compliance with this European Standard, are contained in HD 638. NOTE: National requirements may specify special conditions for public transport signals (PT) and for any other signal that is not specified in a European Standard. 2 Normative references This European Standard incorporates, by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. EN 12368, Traffic control equipment Signal heads and poles. HD 638:1999, Road traffic signal systems. 3 Definitions For the purposes of this European Standard, the following definitions apply. 3.1 absent signal intended signal the luminous intensity of which does not comply with the signal “ON” requirements as specified in HD 638:1999 3.2 bicycle signal traffic signal for the exclusive purpose of directing bicycle traffic at signalized locations 3.3 central control system for co-ordinating and monitoring a network or group of traffic signals using a central computer, or equivalent device, and transmission systems 3.4 conflicting green (green/green conflict) simultaneous display of green signals allowing conflicting traffic movements 3.5 conflicting signal groups two or more signal groups that will cause conflicting traffic movements if operated concurrently Page 4 EN 12675:2000 © BSI 02-2001 3.6 failure mode non-operational state of the traffic signal controller in which, as a result of a major fault, the normal operation mode is replaced with a flashing yellow or a signals off condition 3.7 green signal signal that is displayed to traffic having the colour “green” as specified in EN 12368 3.8 major fault fault the occurrence of which has the effect that the safe operation of the signal traffic system cannot be guaranteed as defined in the national requirements 3.9 manual operation mode operational state of the traffic signal controller in which the state of the signals to traffic is controlled manually by an operator 3.10 memory device means of storing information in a manner permitting its retrieval 3.11 minor faults fault as defined in the national requirements, other than a major fault, that is capable of being identified and recorded 3.12 mode specific condition of a traffic signal controller used to control the signals to traffic. Examples are: standby operation mode; manual operation mode; normal operation mode; failure mode. 3.13 monitoring method of collecting information about the traffic signal controller including diagnostic checks used to detect a fault condition 3.14 national signal regulation order and appearance of signal aspects, displayed to traffic, that are prescribed in national requirements 3.15 national signal sequence sequential order and appearance of signals, to traffic, to satisfy a specific national condition and/or application (e.g. signal start-up sequence) Page 5 EN 12675:2000 © BSI 02-2001 3.16 normal operation mode any operational state of the traffic signal controller, other than failure mode, especially the operational state in which the signals are in accordance with the national signal regulation 3.17 pedestrian signal traffic signal for the exclusive purpose of directing pedestrian traffic at signalized locations 3.18 portable traffic control equipment traffic signal control equipment designed for temporary applications and designed for easy transportation from one site to another 3.19 power supply power source providing energy to an active device or circuit 3.20 public transport signals (PT) traffic signal for the exclusive purpose of directing public transport vehicles at signalized locations 3.21 red signal signal that is displayed to traffic having a colour “red” as specified in EN 12368 3.22 safety timings time settings that, in the event of an error, can affect the safety of the traffic signal control equipment 3.23 shuttle signals set of traffic signals controlling a narrow section of road where traffic can only proceed in each direction alternatively 3.24 signal dynamic message supplied to road users 3.25 signal group group of signal heads that always receive identical signal light indications 3.26 signal head device which comprises one or more optical units, including the housing(s), together with all the mounting brackets, fixings, hoods, visors, cowls and background screens, whose task is to convey a visual message to road users 3.27 standby operation mode operational state of the traffic signal controller in which a flashing yellow signal, or signals off condition, is permitted by the national signal regulation Page 6 EN 12675:2000 © BSI 02-2001 3.28 start-up sequence when requested under normal operation of the controller, it may be required to go through a controlled start-up sequence to change from the display of either “all signals off” or “flashing yellow” to normal operation mode 3.29 time settings all the time information relating to the traffic signal controller for a particular intersection 3.30 traffic control regulation of traffic by traffic signals or traffic signs 3.31 traffic signal controller equipment driving traffic signals 3.32 traffic signal control equipment traffic signal controller, working together with the signal under control, and the associate interface equipment 3.33 unwanted signal unintended signal the luminous intensity of which does not comply with the signal “OFF” requirements as specified in HD 638:1999 3.34 yellow signal a signal that is displayed to traffic having a colour “yellow” as specified in EN 12368 4 Functional safety requirements 4.1 General This European Standard specifies the minimum safety requirements for traffic signal controllers to ensure the safe state of signals displayed to traffic. This safety consists of preventing a fault, or the consequences of a fault, that could result in the display of information liable to present a hazard to road users. A hazard to road users is prevented by the ability of the traffic signal controller to detect a specified fault condition and to change to a safe state. The change to a safe state is determined by the ability of the traffic signal controller to respond to the occurrence of faults in accordance with clause 5. A fault condition may be dependent on the configuration of signal groups for specific application requirements. The specified fault condition shall be classified as a major or minor fault condition and acted on accordingly. Diagnostic checks shall be provided within the traffic signal controller for the detection of specified fault conditions. This is achieved by monitoring the appropriate: a) outputs; b) logic circuits; c) inputs. Page 7 EN 12675:2000 © BSI 02-2001 4.2 Application of power On application of power to the traffic signal controller, the controller shall undertake internal checks to ensure that the operating programs start in a pre-defined condition. These checks shall ensure that all memories are initialized to their correct state and that all memory devices are checked. In the event of an error, the traffic signal controller shall not change to the control mode of operation. 4.3 Diagnostic checks of traffic signal controller logic system Diagnostic checks shall check the traffic signal controller logic system. The diagnostic check interval, and the action to be taken as a result of diagnostic checks, shall not be greater than 10 s. In the event of an error, the traffic signal controller shall change to the failure mode. 4.4 Classification of faults This European Standard defines the minimum specification for a traffic signal controller with respect to safety for the road user. This safety consists of avoiding the display of incorrect messages on