BS EN 12675:2017
$142.49
Traffic signal controllers. Functional safety requirements
| Published By | Publication Date | Number of Pages |
| BSI | 2017 | 24 |
This European Standard specifies the functional safety requirements for traffic signal controllers. It is applicable to traffic signal control equipment permanent¬ly and temporarily installed, but excludes portable traffic control equip¬ment. 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 equip¬ment 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.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 2 | National foreword |
| 8 | 1 Scope 2 Normative references 3 Terms and definitions |
| 12 | 4 Functional safety requirements 4.1 General |
| 13 | 4.2 Application of power 4.3 Diagnostic checks of traffic signal controller logic system 4.4 Classification of faults |
| 14 | 4.5 Conflict faults 4.5.1 Signal group conflicts (unwanted signals) 4.5.2 Signal group green/absent red conflict |
| 15 | 4.5.3 Absent red/absent red conflicts 4.6 National signal regulations (unwanted signals) |
| 16 | 4.7 Absent signals 4.7.1 Absent signal group red signals |
| 17 | 4.7.2 Absent signal groups, yellow or green signals 4.8 Compliance checking 4.9 Safety timings |
| 18 | 4.10 National signal sequences 4.11 Faults of external inputs |
| 19 | 5 Fault condition 5.1 General 5.2 Major faults 5.3 Minor faults 5.4 Storage of faults |
| 20 | 6 User documentation 7 Marking and labelling |
| 21 | Annex A (informative) A-deviations |
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BS EN 12675:2017 – TC:2020 Edition
Tracked Changes. Traffic signal controllers. Functional safety requirements Published By Publication Date Number of Pages…
