1、BRITISH STANDARD BS EN 61334-4-61: 1998 IEC 61334-4-61: 1998 Distribution automation using distribution line carrier systems Part 4-61: Data communication protocols Network layer Connectionless protocol The European Standard EN61334-4-61:1998 has the status of a British Standard ICS 29.240.99; 33.04
2、0.40; 35.100.30BSEN 61334-4-61:1998 This British Standard, having been prepared under the directionof the Electrotechnical Sector Committee, waspublishedunder the authorityofthe Standards Committee andcomes into effect on 15 December 1998 BSI 05-1999 ISBN 0 580 30958 4 National foreword This British
3、 Standard is the English language version of EN61334-4-61:1998. It is identical with IEC61334-4-61:1998. The UK participation in its preparation was entrusted to Technical Committee PEL/57, Power systems control and communications, which has the responsibility to: aid enquirers to understand the tex
4、t; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this committe
5、e can be obtained on request to its secretary. From 1 January1997, all IEC publications have the number60000 added to the old number. For instance, IEC27-1 has been renumbered as IEC60027-1. For a period of time during the change over from one numbering system to the other, publications may contain
6、identifiers from both systems. Cross-references Attention is drawn to the fact that CEN and CENELEC standards normally include an annex which lists normative references to international publications with their corresponding or European publications. The British Standards which implement internationa
7、l or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all th
8、e 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, pages i and ii,
9、 theEN title page, pages 2 to 26, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Amendments issued since publication Amd. No. Date CommentsBS
10、EN61334-4-61:1998 BSI 05-1999 i Contents Page National foreword Inside front cover Foreword 2 Text of EN 61334-4-61 9ii blankEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 61334-4-61 October 1998 ICS 29.240.20; 33.200 Descriptors: Electrical power, distribution automation, distribution line ca
11、rrier systems, data communication protocols, network layer, connectionless protocol English version Distribution automation using distribution line carriersystems Part4-61: Data communication protocols Network layer Connectionless protocol (IEC 61334-4-61:1998) Automatisation de la distribution laid
12、e de systmes de communication courantsporteurs Partie4-61: Protocoles de communicationdedonnes Couche rseau Protocole sans connexion (CEI61334-4-61:1998) Verteilungsautomatisierung mit Hilfe von Trgersystemen auf Verteilungsleitungen Teil4-61: Datenkommunikationsprotokolle Vermittlungsschicht Verbin
13、dungslosesProtokoll (IEC61334-4-61:1998) This European Standard was approved by CENELEC on1998-10-01. 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 alteratio
14、n. 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 transl
15、ation 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, CzechRepublic, Denmark, Finland, France, Germany, Greece, I
16、celand, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and UnitedKingdom. CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue d
17、e Stassart 35, B-1050 Brussels 1998 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 61334-4-61:1998 EEN61334-4-61:1998 BSI 05-1999 2 Foreword The text of document57/356/FDIS, future edition1 of IEC61334-4-61, prepared by IECTC57, Po
18、wer system control and associated communications, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN61334-4-61 on1998-10-01. The following dates were fixed: Annexes designated “normative” are part of the body of the standard. In this standard, Annex ZA is normative. Ann
19、ex ZA has been added by CENELEC. Endorsement notice The text of the International Standard IEC61334-4-61:1998 was approved by CENELEC as a European Standard without any modification. Contents Page Foreword 2 Introduction 5 1 General 9 1.1 Scope and object 9 1.2 Normative references 9 1.3 Acronyms an
20、d definitions 10 2 N service definition 10 2.1 Overview of interactions 10 2.1.1 Data transfer services 10 2.1.2 Management services 11 2.2 N_Data.request 11 2.2.1 Function 11 2.2.2 Structure 12 2.2.3 Use 12 2.3 N_Data.confirm 12 2.3.1 Function 12 2.3.2 Structure 12 2.3.3 Use 13 2.4 N_Data.indicatio
21、n 13 2.4.1 Function 13 2.4.2 Structure 13 2.4.3 Use 13 2.5 N_Add_route.request 13 2.5.1 Function 13 2.5.2 Structure 13 2.5.3 Use 14 2.6 N_Del_route.request 14 2.6.1 Function 14 2.6.2 Structure 14 2.6.3 Use 14 2.7 N_Read_table.request 14 2.7.1 Function 14 2.7.2 Structure 14 2.7.3 Use 14 2.8 N_Read_ta
22、ble.confirm 14 2.8.1 Function 14 2.8.2 Structure 15 2.8.3 Use 15 2.9 N_Await_event.request 15 2.9.1 Function 15 2.9.2 Structure 15 2.9.3 Use 15 latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 1999-07-01 late
23、st date by which the national standards conflicting with the EN have to be withdrawn (dow) 2001-07-01EN61334-4-61:1998 BSI 05-1999 3 Page 2.10 N_Await_event.confirm 15 2.10.1 Function 15 2.10.2 Structure 15 2.10.3 Use 16 2.11 N_Local_address.request 16 2.11.1 Function 16 2.11.2 Structure 16 2.11.3 U
24、se 16 3 N To LLC sublayer interface 16 3.1 Overview of interactions 16 3.2 DL_Data.request 19 3.3 DL_Data.confirm 19 3.4 DL_Data.indication 19 4 N-protocol data unit structure 19 4.1 General 19 4.2 NPDU format 19 4.3 Network address fields 20 4.4 DNSAP field and the P-bit 20 4.5 SNSAP field and the
25、O-bit 20 4.6 QoS field 20 4.7 Reserved field 20 4.8 Invalid NPDU 20 5 N-protocol procedures description 21 5.1 Overview of the procedures 21 5.1.1 Procedure for transmission 21 5.1.2 NPDU routing 21 5.1.3 Parity bits 21 5.1.4 N-entity internal parameters 22 5.2 N-entity flow diagram 22 5.2.1 N_Data.
26、request flow diagram 22 5.2.2 DL_Data.indication flow diagram 23 5.2.3 DL_Data.confirm flow diagram 24 5.2.4 N-protocol machine actions 24 6 Mapping of network layer 25 Annex ZA (normative) Normative referencestointernationalpublications withtheircorresponding European publications Inside back cover
27、 Figure 1 Basic layered communicationarchitecture 6 Figure 2 Subnetwork interconnection throughapplication gateway 7 Figure 3 Subnetwork interconnection throughanode routing station 8 Figure 4 Subnetwork interconnection inamixedapproach 9 Page Figure 5 Data transfer without acknowledgment 11 Figure
28、6 Routing function in the networklayerfor messages coming from N-user 17 Figure 7 Routing function in the networklayerfor messages to be locally delivered 18 Figure 8 Routing function in the networklayerfor messages to be forwarded 18 Figure 9 NPDU fields 20 Table 8 Server unsolicited service state
29、table 25 Table 9 Client unsolicited service state table 254 blankEN61334-4-61:1998 BSI 05-1999 5 Introduction This part of IEC61334 is closely related to IEC61334-4-1 that refers to a minimal three-layer architecture as an example of the use of an efficient communication architecture to build a comm
30、unication system used for low-voltage DLC applications. Nevertheless, the suggested layered architecture is open to support additional features which are to be implemented in the case of several subnetworks, as MV and LV networks, are used for DLC applications. The basic three layer communication ar
31、chitecture provides communication among applications which are hosted by stations on one single line carrier link (e.g. an LV section), as in the example represented inFigure 1: this set of stations is here defined as a “subnetwork”. Furthermore, two subnetworks may be connected through an internetw
32、orking unit which hosts an application acting as gateway in case of communication between a client and a server running on stations that belong to different subnetworks (seeFigure 2). Another approach is to define a network layer entity(N) supporting a routing function which provides the necessary a
33、ddress mapping between the two subnetworks (seeFigure 3). In the example ofFigure 3, all the stations have to implement the network layer function: nevertheless, applications running on the same subnetwork may directly use the LLC services using a LSAP different from that assigned to the network lay
34、er entity, as defined in the following. In the general case, a mixed approach may be useful and a number of subnetworks could be crossed by a message (seeFigure 4 for an application example). A protocol at the network layer is to be used and the entity, implementing it, is located between the N-user
35、 and the LLC layers, as defined in the following architecture model. This standard provides the N service definition and the N-protocol specification, with specific reference to the application ofFigure 4. Network layer mapping functions to application layer are described in clause6.EN61334-4-61:199
36、8 6 BSI 05-1999 Figure 1 Basic layered communication architectureEN61334-4-61:1998 BSI 05-1999 7 Figure 2 Subnetwork interconnection through application gatewayEN61334-4-61:1998 8 BSI 05-1999 Figure 3 Subnetwork interconnection through a node routing stationEN61334-4-61:1998 BSI 05-1999 9 1 General
37、1.1 Scope and object This part of IEC61334 covers the services required of, or by, the DCP network layer (N) sublayer entity at the logical interfaces with the N user layer and the LLC sublayer, using the connectionless N procedures. Services are specified showing the information flow between the N
38、user and the LLC service, by describing the service primitives and parameters which characterize each service. The primitives in this standard are associated with the connectionless N protocol, providing connectionless services. 1.2 Normative references The following normative documents contain prov
39、isions which, through reference in this text, constitute provisions of this part of IEC61334. At the time of publication, the editions indicated were valid. All normative documents are subject to revision, and parties to agreements based on this part of IEC61334 are encouraged to investigate the pos
40、sibility of applying the most recent editions of normative documents indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. IEC 61334-4-1:1996, Distribution automation using distribution line carrier systems Part4: Data communication protocols Section1
41、: Reference model of the communication system. IEC 61334-4-33:1998, Distribution automation using distribution line carrier systems Part4-33: Data communication protocols Data link layer Connection oriented protocol. Figure 4 Subnetwork interconnection in a mixed approachEN61334-4-61:1998 10 BSI 05-
42、1999 IEC 61334-4-41:1996, Distribution automation using distribution line carrier systems Part4:Data communication protocols Section41:Application protocols Distribution line message specification. IEC 61334-4-42:1996, Distribution automation using distribution line carrier systems Part4:Data commun
43、ication protocols Section42:Application protocols Application layer. ISO/IEC 7498, Information technology Open Systems Interconnection Basic Reference Model. 1.3 Acronyms and definitions 2 N service definition The N service primitives allow a connectionless, unacknowledged data transfer at the N-use
44、r interface, improving the addressing capabilities of the underlying LLC service. The N data transfer primitive refers to a network address and, in the general case, while in the global network two or more stations belonging to different subnetworks may have the same MAC station address, each of the
45、m will be univocally identified by its own unique network address. In details, an N user is identified by its title composed by a network address and a NSAP selector, in a similar way as specified in IEC61334-4-1. A message coming from an N user has associated the network destination address and the
46、 N-entity should map it in a transmission request to the underlying LLC sublayer, with an associated LLC destination station address of the next station involved in the network path to be traversed by the message. The LLC destination station address is composed of two parts: the LSAP selector (the f
47、ixed value01 Hex assigned to the referenced symbol N-entity_LSAP, identifying the N-entity LSAP) and the MAC address. Therefore, each N-entity has to have a table (routing table) to execute the addressing translation between the network destination address and the next-hop station LLC address. The N
48、-entity recognizes also its own local station network address, so that the messages for its local N-users are not routed to the next-hop station but delivered to them. The services assumed from the LLC sublayer are those related to the LLC connection oriented (LLC-CO) protocol mode, which supports b
49、i-directional full-duplex connectionless LLC service of data transfer. It should be noted that the network layer does not support segmentation nor reassembling of data: that means the NSDUs have to be a maximum size compatible with the size supported by all the involved subnetworks. The services are described in an abstract way. 2.1 Overview of interactions 2.1.1 Data transfer services Three services are defined to provide bi-directional data transfer: N_Data.request, N_Data.c
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