1、August 2014DEUTSCHE NORM Normenausschuss Heiz- und Raumlufttechnik (NHRS) im DINPreisgruppe 12DIN Deutsches Institut fr Normung e. V. Jede Art der Vervielfltigung, auch auszugsweise, nur mit Genehmigung des DIN Deutsches Institut fr Normung e. V., Berlin, gestattet.ICS 97.120; 35.240.99; 91.140.01!%
2、1DL“2143341www.din.deDDIN EN 14908-2Firmenneutrale Datenkommunikation fr die Gebudeautomation undGebudemanagement Gebude-Netzwerk-Protokoll Teil 2: Kommunikation ber paarig verdrillte Leitungen;Englische Fassung EN 14908-2:2014Open Data Communication in Building Automation, Controls and Building Man
3、agement Control Network Protocol Part 2: Twisted Pair Communication;English version EN 14908-2:2014Rseau ouvert de communication de donnes pour lautomatisation, la rgulation et lagestion technique du btiment Protocole de contrle du rseau Partie 2: Communication par paire torsade;Version anglaise EN
4、14908-2:2014Alleinverkauf der Normen durch Beuth Verlag GmbH, 10772 BerlinErsatz frDIN EN 14908-2:2006-01www.beuth.deGesamtumfang 22 SeitenDIN EN 14908-2:2014-08 2 Nationales Vorwort Dieses Dokument (EN 14908-2:2014) wurde vom Technischen Komitee CEN/TC 247 Building environment design“ erarbeitet, d
5、essen Sekretariat vom SNV (Schweiz) gehalten wird. Das zustndige deutsche Gremium ist der Arbeitsausschuss NA 041-03-68 AA Gebudeautomation und -kommunikation (SpA CEN/TC 247/WG 4)“ im Normenausschuss Heiz- und Raumlufttechnik (NHRS) im DIN. Der englische Originaltext dieser Europischen Norm wurde u
6、nverndert bernommen. Das Prsidium des DIN hat mit seinem Beschluss 1/2004 festgelegt, dass von dem in den Regeln der europischen Normungs-arbeit von CEN/CENELEC verankerten Grundsatz, wonach Europische Normen in den drei offiziellen Sprachen Deutsch, Englisch und Franzsisch verffentlicht werden, in
7、begrndeten Ausnahmefllen abgewichen und auf die deutsche Sprachfassung verzichtet werden kann. Die Genehmigung dafr hat die DIN-Geschftsleitung entsprechend ihren in Anlage 1 zu dem DIN-Rundschreiben A5/2004 festgelegten Kriterien fr die vorliegende Norm auf Antrag des NHRS als Ergebnis einer Einzel
8、fallentscheidung erteilt, zumal bereits dieser Norm zugrunde liegende Papiere berwiegend in englischer Sprache auch von den deutschen Marktteilnehmern angewendet werden. Da sich die Anwender der vorliegenden Norm der englischen Sprache als Fachsprache bedienen, wird die englische Fassung der EN 1490
9、8-2 verffentlicht. Die Europische Norm EN 14908-2 ist Teil einer Serie von Normen, die sich mit dem Kommunikationssystem Building Network Protocol“ befassen, das auf der LonWorks-Technologie basiert. In dieser Serie werden sowohl Hardware als auch Software spezifiziert, die fr die Funktion des Kommu
10、nikationssystems notwendig sind. Des Weiteren wird es Teile geben, in der Funktionen, Profile und Konformittstests beschrieben werden. In EN 14908-2 wird als Medium fr die Kommunikation die verdrilllte Zweidraht-Leitung (Twisted Pair) als Teil der Bitbertragungsschicht (Physical Layer) spezifiziert.
11、 Dabei werden die elektrischen Eigenschaften sowohl fr Netzwerke mit freier Topologie als auch mit Linien-Topologie beschrieben sowie die Anforderungen fr die Versorgung kleinerer Gerte mit elektrischer Energie ber die Bus-Leitungen (Link Power). DIN EN 14908 besteht aus den folgenden Teilen unter d
12、em Haupttitel Firmenneutrale Datenkommunikation fr die Gebudeautomation und Gebudemanagement: Teil 1: Datenprotokollschichtenmodell Teil 2: Kommunikation ber paarig verdrillte Leitungen Teil 3: Kommunikation ber die Stromversorgungsleitungen Teil 4: Kommunikation mittels Internet Protokoll (IP) Teil
13、 5: Implementierungsrichtlinie nderungen Gegenber DIN EN 14908-2:2006-01 wurden folgende nderungen vorgenommen: a) Redaktionelle berarbeitung (z. B. Verweisungen aktualisiert). Frhere Ausgaben DIN EN 14908-2: 2006-01 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 14908-2 April 2014 ICS 35.240.
14、99; 91.140.01; 97.120 Supersedes EN 14908-2:2005 English Version Open Data Communication in Building Automation, Controls and Building Management Control Network Protocol Part 2: Twisted Pair Communication Rseau ouvert de communication de donnes pour lautomatisation, la rgulation et la gestion techn
15、ique du btiment Protocole de contrle du rseau Partie 2: Communication par paire torsade Firmenneutrale Datenkommunikation fr die Gebudeautomation und Gebudemanagement Gebude-Netzwerk-Protokoll Teil 2: Kommunikation ber paarig verdrillte Zweidrahtleitungen This European Standard was approved by CEN o
16、n 12 April 2013. 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
17、 be obtained on application to the CEN-CENELEC Management Centre 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 t
18、o the CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland,
19、 Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Managemen
20、t Centre: Avenue Marnix 17, B-1000 Brussels 2014 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 14908-2:2014 E EN 14908-2:2014 (E) 2 Contents Foreword . 3 Introduction 4 1 Scope . 5 2 Normative references . 5 3 Network overview .
21、5 4 System specifications 5 4.1 General aspects 5 4.2 Cable 5 4.3 Topology 5 4.3.1 Free or bus topology 5 4.3.2 Repeater . 6 4.4 Cable termination 6 4.4.1 Free-topology segment 6 4.4.2 Bus topology segment . 6 4.5 Segment configuration . 6 4.6 Power specifications 7 5 Link power . 7 5.1 General . 7
22、5.2 Source 7 5.3 Power supply requirements . 8 5.4 Passive coupler circuit . 11 6 Node specifications 12 6.1 Link power . 12 6.2 Hot plugging 12 6.3 Transmitter/receiver interface to the MAC sub-layer 13 6.3.1 Physical layer protocol data unit 13 6.3.2 Frame format . 13 6.3.3 Transmit waveform . 14
23、6.4 Impedance . 16 7 Communication parameters 17 Annex A (informative) Environmental specifications . 19 Bibliography . 20 DIN EN 14908-2:2014-08 EN 14908-2:2014 (E) 3 Foreword This document (EN 14908-2:2014) has been prepared by Technical Committee CEN/TC 247 “Building Automation, Controls and Buil
24、ding Management”, the secretariat of which is held by SNV. 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 October 2014 and conflicting national standards shall be withdrawn at the latest by Octob
25、er 2014. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 14908-2:2005. This European Standard is part of a
26、 series of standards for open data transmission in building automation, control and in building management systems. The content of this European Standard covers the data communications used for management, automation/control and field functions. EN 14908-2 is part of a series of European Standards u
27、nder the general title Control Network Protocol (CNP), which comprises the following parts: Part 1: Protocol stack; Part 2: Twisted pair communication; Part 3: Power line channel specification; Part 4: IP-Communication; Part 5: Implementation; Part 6: Application elements. According to the CEN-CENEL
28、EC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Ice
29、land, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. DIN EN 14908-2:2014-08 EN 14908-2:2014 (E) 4 Introduction This European Standard has been prepared to provide mec
30、hanisms through which various vendors of building automation, control, and building management systems may exchange information in a standardised way. It defines communication capabilities. This European Standard will be used by all involved in design, manufacture, engineering, installation and comm
31、issioning activities. DIN EN 14908-2:2014-08 EN 14908-2:2014 (E) 5 1 Scope This European Standard specifies the control network protocol (CNP) free-topology twisted-pair channel for networked control systems in commercial Building Automation, Controls and Building Management and is used in conjuncti
32、on with EN 14908-1:2014. The channel supports communication at 78,125 kbit/s between multiple nodes, each of which consists of a transceiver, a protocol processor, an application processor, a power supply, and application electronics. This European Standard covers the complete physical layer (OSI La
33、yer 1), including the interface to the Media Access Control (MAC) sub-layer and the interface to the medium. Parameters that are controlled by other layers but control the operation of the physical layer are also specified. 2 Normative references The following documents, in whole or in part, are nor
34、matively 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 14908-1:2014, Open Data Communication in Building Automat
35、ion, Controls and Building Management - Control Network Protocol - Part 1: Protocol Stack EN 50173-1, Information technology Generic cabling systems Part 1: General requirements 3 Network overview The CNP free-topology twisted-pair channel supports up to 128 nodes on a single network segment with an
36、 optional link power source that supplies DC power to the nodes on the network. The channel is specified to support free-topology wiring, and will accommodate bus, star, loop, or any combination of these topologies. The total network length and number of nodes may be extended by use of CNP channel p
37、hysical layer repeaters, or CNP compliant routers. The channel data rate is 78,125 kbit/s. Nodes can be either locally powered or link powered. A link-powered node derives its power from the network. The power is delivered on the same two conductors that carry data. Nodes are polarity-insensitive wi
38、th respect to data as well as DC power. A locally powered node derives its power from a local source. The data is transmitted using Differential Manchester encoding, which is polarity-insensitive. 4 System specifications 4.1 General aspects This sub-clause specifies the cable type used, terminations
39、 required with bus or free topology, maximum node counts and distances for link and locally powered schemes, and the maximum steady state power that can be drawn from the link power supply. 4.2 Cable The cable shall conform to EN 50173-1. 4.3 Topology 4.3.1 Free or bus topology The network may use e
40、ither a singly-terminated free topology or a doubly-terminated bus topology. DIN EN 14908-2:2014-08 EN 14908-2:2014 (E) 6 4.3.2 Repeater Two network segments may be interconnected with a channel physical layer repeater. No more than one physical layer repeater shall be in a path between any two node
41、s on a network. Physical layer repeaters shall not be interconnected in such a way as to create a loop. Each port of a physical layer repeater shall meet the specifications stated in 6.2, 6.3.3, and 6.4. The delay through the repeater shall not exceed 36 s. 4.4 Cable termination 4.4.1 Free-topology
42、segment A free-topology segment shall have a single termination. If the segment is locally powered, an RC network as shown in Figure 1 shall be used, with R1 = 52,3 1 %, 1/8 W. The termination may be located anywhere on the segment. If the segment is link-powered, the termination shall be provided b
43、y the link power source. See Figure 5. The link power source and termination may be located anywhere on the segment. 4.4.2 Bus topology segment A bus topology segment shall have two terminations, one at each end of the bus. If the segment is locally powered, an RC network as shown in Figure 1 shall
44、be used, with R1 = 105 1 %, 1/8 W at each end. If the segment is link-powered, the link power source shall provide one termination. See Figure 5. The other termination shall be an RC network as shown in Figure 1, with R1 = 105 1 %, 1/8 W. Key 1 network connection Figure 1 Termination 4.5 Segment con
45、figuration A free-topology twisted-pair channel shall support up to 128 link-powered or 64 locally-powered nodes at a maximum bit error rate of 1 in 100 000. Both types of nodes shall be supported on a given segment, provided the following constraint is met: 128 nodes) poweredlocally ofnumber (2 nod
46、es) poweredlink ofnumber (1 + Table 1 shows the maximum bus length for a bus-topology segment. DIN EN 14908-2:2014-08 EN 14908-2:2014 (E) 7 Table 2 shows the maximum node-to-node distance and maximum wire length for a free-topology segment. The distance from each node to each of the other nodes and
47、to the link power source shall not exceed the maximum node-to-node distance. If multiple paths exist, e.g., a loop topology, then the longest path shall be used for the calculations. The maximum wire length is the total amount of wire connected to a network segment. Table 1 Bus-topology distance spe
48、cifications Maximum Bus Length Maximum Stub Length Units 600 3 m Table 2 Free topology distance specifications Maximum Node-to-node Distance Maximum Total Wire length Units 250 450 m 4.6 Power specifications The sum of the steady-state power drawn by all nodes on a segment shall not exceed 36,5 watt
49、s. For each branch, the sum of the products of each nodes distance multiplied by that nodes power shall not exceed a constant: + C . . . dP dP dP33 2211(1) where C is a constant, dependent on wire type, taking into account manufacturing tolerance and all other variations except wire temperature; C = 1,9 x 103Wm; Pi= Node power, i.e., the maximum steady-state power drawn by node i from the network, in watts; di= Node distance, i.e., th
