1、BSI Standards PublicationOPC unified architecturePart 8: Data AccessBS EN 62541-8:2015National forewordThis British Standard is the UK implementation of EN 62541-8:2015. It isidentical to IEC 62541-8:2015. It supersedes BS EN 62541-8:2011 which iswithdrawn.The UK participation in its preparation was
2、 entrusted to TechnicalCommittee AMT/7, Industrial communications: process measurement andcontrol, including fieldbus.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisions ofa contrac
3、t. Users are responsible for its correct application. The British Standards Institution 2015.Published by BSI Standards Limited 2015ISBN 978 0 580 83007 5ICS 25.040.40; 25.100.01Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under
4、the authority of theStandards Policy and Strategy Committee on 31 May 2015.Amendments/corrigenda issued since publicationDate Text affectedBRITISH STANDARDBS EN 62541-8:2015EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 62541-8 May 2015 ICS 25.040.40; 35.100 Supersedes EN 62541-8:2011 English
5、Version OPC unified architecture - Part 8: Data Access (IEC 62541-8:2015) Architecture unifie OPC - Partie 8: Accs aux donnes (IEC 62541-8:2015) OPC Unified Architecture - Teil 8: Zugriff auf Automatisierungsdaten (IEC 62541-8:2015) This European Standard was approved by CENELEC on 2015-04-29. CENEL
6、EC 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 ap
7、plication 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-
8、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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary,
9、 Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique E
10、uropisches Komitee fr Elektrotechnische Normung CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2015 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members. Ref. No. EN 62541-8:2015 E BS EN 62541-8:2015EN 62541-8:2015 - 2 - Foreword Th
11、e text of document 65E/381/CDV, future edition 2 of IEC 62541-8, prepared by SC 65E “Devices and integration in enterprise systems“, of IEC/TC 65 “Industrial-process measurement, control and automation“ was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as EN 62541-8:2015. The fo
12、llowing dates are fixed: latest date by which the document has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2016-01-29 latest date by which the national standards conflicting with the document have to be withdrawn (dow) 2018-04-29 This
13、document supersedes EN 62541-8:2011. 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 document has been prepared under a mandate g
14、iven to CENELEC by the European Commission and the European Free Trade Association, and supports essential requirements of EU Directive(s). Endorsement notice The text of the International Standard IEC 62541-8:2015 was approved by CENELEC as a European Standard without any modification. BS EN 62541-
15、8:2015- 3 - EN 62541-8:2015 Annex ZA (normative) Normative references to international publications with their corresponding European publications The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references
16、, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. NOTE 1 When an International Publication has been modified by common modifications, indicated by (mod), the relevant EN/HD applies. NOTE 2 Up-to-date informatio
17、n on the latest versions of the European Standards listed in this annex is available here: www.cenelec.eu. Publication Year Title EN/HD Year IEC/TR 62541-1 - OPC unified architecture - Part 1: Overview and concepts CLC/TR 62541-1 - IEC 62541-3 - OPC unified architecture - Part 3: Address Space Model
18、 EN 62541-3 - IEC 62541-4 - OPC Unified Architecture - Part 4: Services EN 62541-4 - IEC 62541-5 - OPC unified architecture - Part 5: Information Model EN 62541-5 - UNECE 20 - Codes for Units of Measure Used in International Trade - - BS EN 62541-8:2015 2 IEC 62541-8:2015 IEC 2015 CONTENTS FOREWORD
19、. 4 1 Scope 6 2 Normative references. 6 3 Terms, definitions and abbreviations 6 3.1 Terms and definitions 6 3.2 Abbreviations and symbols 7 4 Concepts . 7 5 Model 8 5.1 General . 8 5.2 SemanticsChanged . 9 5.3 Variable Types 9 5.3.1 DataItemType 9 5.3.2 AnalogItemType . 10 5.3.3 DiscreteItemType .
20、11 5.3.4 ArrayItemType . 13 5.4 Address Space model . 18 5.5 Attributes of DataItems 19 5.6 DataTypes 20 5.6.1 Overview 20 5.6.2 Range 20 5.6.3 EUInformation 20 5.6.4 ComplexNumberType . 21 5.6.5 DoubleComplexNumberType 22 5.6.6 AxisInformation 22 5.6.7 AxisScaleEnumeration 23 5.6.8 XVType 23 6 Data
21、 Access specific usage of Services . 23 6.1 General . 23 6.2 PercentDeadband . 24 6.3 Data Access status codes . 24 6.3.1 Overview 24 6.3.2 Operation level result codes . 24 6.3.3 LimitBits . 26 Figure 1 OPC DataItems are linked to automation data . 8 Figure 2 DataItem VariableType hierarchy 9 Figur
22、e 3 Graphical view of a YArrayItem . 15 Figure 4 Representation of DataItems in the AddressSpace 19 Table 1 DataItemType definition . 9 Table 2 AnalogItemType definition . 10 Table 3 DiscreteItemType definition . 11 Table 4 TwoStateDiscreteType definition 12 Table 5 MultiStateDiscreteType definition
23、 . 12 Table 6 MultiStateValueDiscreteType definition 13 BS EN 62541-8:2015IEC 62541-8:2015 IEC 2015 3 Table 7 ArrayItemType definition 14 Table 8 YArrayItemType definition 14 Table 9 YArrayItem item description . 15 Table 10 XYArrayItemType definition 16 Table 11 ImageItemType definition . 17 Table
24、12 CubeItemType definition 17 Table 13 NDimensionArrayItemType definition 18 Table 14 Range DataType structure . 20 Table 15 Range definition 20 Table 16 EUInformation DataType structure . 20 Table 17 EUInformation definition . 20 Table 18 Examples from the UNECE Recommendation . 21 Table 19 Complex
25、NumberType DataType structure 22 Table 20 ComplexNumberType definition 22 Table 21 DoubleComplexNumberType DataType structure 22 Table 22 DoubleComplexNumberType definition . 22 Table 23 AxisInformation DataType structure 22 Table 24 AxisScaleEnumeration values 23 Table 25 AxisScaleEnumeration defin
26、ition 23 Table 26 XVType DataType structure . 23 Table 27 XVType definition 23 Table 28 Operation level result codes for BAD data quality . 25 Table 29 Operation level result codes for UNCERTAIN data quality 25 Table 30 Operation level result codes for GOOD data quality 25 BS EN 62541-8:2015 4 IEC 6
27、2541-8:2015 IEC 2015 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ OPC UNIFIED ARCHITECTURE Part 8: Data Access FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees).
28、 The object of IEC is to promote international co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports, Publicly Available Spe
29、cifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with may participate in this preparatory work. International, governmental and non-governmental organizatio
30、ns liaising with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for Standardization (ISO) in accordance with conditions determined by agreement between the two organizations. 2) The formal decisions or agreements of IEC on technical matters
31、 express, as nearly as possible, an international consensus of opinion on the relevant subjects since each technical committee has representation from all interested IEC National Committees. 3) IEC Publications have the form of recommendations for international use and are accepted by IEC National C
32、ommittees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any misinterpretation by any end user. 4) In order to promote international uniformity, IEC Na
33、tional Committees undertake to apply IEC Publications transparently to the maximum extent possible in their national and regional publications. Any divergence between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter. 5) IEC itself do
34、es not provide any attestation of conformity. Independent certification bodies provide conformity assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any services carried out by independent certification bodies. 6) All users should ensure that they h
35、ave the latest edition of this publication. 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and members of its technical committees and IEC National Committees for any personal injury, property damage or other damage of any nature what
36、soever, whether direct or indirect, or for costs (including legal fees) and expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications. 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced public
37、ations is indispensable for the correct application of this publication. 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights. International Stan
38、dard IEC 62541-8 has been prepared by subcommittee 65E: Devices and integration in enterprise systems, of IEC technical committee 65: Industrial-process measurement, control and automation. This second edition cancels and replaces the first edition published in 2011. This edition constitutes a techn
39、ical revision. This edition includes the following significant technical changes with respect to the previous edition: a) Clarified that deadband has to be between 0.0 and 100.0. Violations result in error Bad_DeadbandFilterInvalid (6.2) b) Added VariableTypes handling ArrayItems and DataTypes suppo
40、rting this, including complex number types. These data types are required for complex analyzer devices but seem useful for other domains as well. BS EN 62541-8:2015IEC 62541-8:2015 IEC 2015 5 The text of this standard is based on the following documents: CDV Report on voting 65E/381/CDV 65E/407/RVD
41、Full information on the voting for the approval of this standard can be found in the report on voting indicated in the above table. This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. A list of all parts of the IEC 62541 series, published under the general title OPC
42、Unified Architecture, can be found on the IEC website. The committee has decided that the contents of this publication will remain unchanged until the stability date indicated on the IEC web site under “http:/webstore.iec.ch“ in the data related to the specific publication. At this date, the publica
43、tion will be reconfirmed, withdrawn, replaced by a revised edition, or amended. IMPORTANT The colour inside logo on the cover page of this publication indicates that it contains colours which are considered to be useful for the correct understanding of its contents. Users should therefore print this
44、 document using a colour printer. BS EN 62541-8:2015 6 IEC 62541-8:2015 IEC 2015 OPC UNIFIED ARCHITECTURE Part 8: Data Access 1 Scope This part of IEC 62451 is part of the overall OPC Unified Architecture (OPC UA) standard series and defines the information model associated with Data Access (DA). It
45、 particularly includes additional VariableTypes and complementary descriptions of the NodeClasses and Attributes needed for Data Access, additional Properties, and other information and behaviour. The complete address space model, including all NodeClasses and Attributes is specified in IEC 62541-3.
46、 The services to detect and access data are specified in IEC 62541-4. 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 referenc
47、es, the latest edition of the referenced document (including any amendments) applies. IEC TR 62541-1, OPC Unified Architecture - Part 1: Overview and Concepts IEC 62541-3, OPC unified architecture - Part 3: Address Space Model IEC 62541-4, OPC unified architecture - Part 4: Services IEC 62541-5, OPC
48、 unified architecture - Part 5: Information Model UN/CEFACT: UNECE Recommendation N 20, Codes for Units of Measure Used in International Trade, available at http:/www.unece.org/cefact/recommendations/rec_index.htm 3 Terms, definitions and abbreviations 3.1 Terms and definitions For the purposes of t
49、his document, the terms and definitions given in IEC TR 62541-1, IEC 62541-3, and IEC 62541-4 as well as the following apply. 3.1.1 DataItem link to arbitrary, live automation data, that is, data that represents currently valid information Note 1 to entry: Examples of such data are device data (such as temperature sensors), calculated data, status information (open/closed, moving), dynamically-changing system data (such a
