EN 61158-1:2014

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Industrijska komunikacijska omrežja - Specifikacije za procesna vodila - 1. del: Pregled in navodila za skupini IEC 61158 in IEC 61784 (IEC 61158-1:2014)Industrielle Kommunikationsnetze - Feldbusse - Teil 1: Überblick und Leitfaden zu den Normen der Reihe IEC 61158 und IEC 61784 (IEC 61158-1:2014)Réseaux de communication industriels - Spécifications des bus de terrain - Partie 1: Séries CEI 61158 et CEI 61784 - Présentation et lignes directrices (CEI 61158-1:2014)Industrial communication networks - Fieldbus specifications - Part 1: Overview and guidance for the IEC 61158 and IEC 61784 series (IEC 61158-1:2014)35.110OmreževanjeNetworking25.040.40Merjenje in krmiljenje industrijskih postopkovIndustrial process measurement and controlICS:Ta slovenski standard je istoveten z:EN 61158-1:2014SIST EN 61158-1:2015en01-marec-2015SIST EN 61158-1:2015SLOVENSKI
STANDARD
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 61158-1
September 2014 ICS 25.040.40; 33.040; 35.100.05
Supersedes CLC/TR 61158-1:2010
English Version
Industrial communication networks - Fieldbus specifications - Part 1: Overview and guidance for the IEC 61158 and IEC 61784 series (IEC 61158-1:2014)
Réseaux de communication industriels - Spécifications des bus de terrain - Partie 1: Présentation et lignes directrices des séries CEI 61158 et CEI 61784 (CEI 61158-1:2014)
Industrielle Kommunikationsnetze - Feldbusse -
Teil 1: Überblick und Leitfaden zu den Normen der Reihe IEC 61158 und IEC 61784 (IEC 61158-1:2014) This European Standard was approved by CENELEC on 2014-06-27. 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 alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application 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-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, 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
Comité Européen de Normalisation Electrotechnique Europäisches Komitee für Elektrotechnische Normung CEN-CENELEC Management Centre: Avenue Marnix 17,
B-1000 Brussels © 2014 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN 61158-1:2014 E SIST EN 61158-1:2015

The following 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) 2015-03-27 • latest date by which the national standards conflicting with the document have to be withdrawn (dow) 2017-06-27
This document supersedes CLC/TR 61158-1:2010.
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 given to CENELEC by the European Commission and the European Free Trade Association.
Endorsement notice The text of the International Standard IEC 61158-1:2014 was approved by CENELEC as a European Standard without any modification. In the official version, for Bibliography, the following notes have to be added for the standards indicated:
IEC 60793-2-30:2012 NOTE Harmonized as EN 60793-2-30:2013 (not modified). IEC 60793-2-40:2009 NOTE Harmonized as EN 60793-2-40:2011 (not modified). IEC 61000-6-2 NOTE Harmonized as EN 61000-6-2. IEC 61131-2 NOTE Harmonized as EN 61131-2. IEC 61158 Series NOTE Harmonized as EN 61158 Series (not modified). IEC 61158-2:2014 NOTE Harmonized as EN 61158-2 1) (not modified). IEC 61158-3-1:2014 NOTE Harmonized as EN 61158-3-1 1) (not modified). IEC 61158-3-2:2014 NOTE Harmonized as EN 61158-3-2 1) (not modified). IEC 61158-3-3:2014 NOTE Harmonized as EN 61158-3-3 1) (not modified). IEC 61158-3-4:2014 NOTE Harmonized as EN 61158-3-4 1) (not modified). IEC 61158-3-7:2007 NOTE Harmonized as EN 61158-3-7:2008 (not modified). IEC 61158-3-8:2007 NOTE Harmonized as EN 61158-3-8:2008 (not modified). IEC 61158-3-11:2007 NOTE Harmonized as EN 61158-3-11:2008 (not modified). IEC 61158-3-12:2014 NOTE Harmonized as EN 61158-3-12 1) (not modified). IEC 61158-3-13:2014 NOTE Harmonized as EN 61158-3-13 1) (not modified). IEC 61158-3-14:2014 NOTE Harmonized as EN 61158-3-14 1) (not modified). IEC 61158-3-16:2007 NOTE Harmonized as EN 61158-3-16:2008 (not modified).
1) To be published. SIST EN 61158-1:2015

- 3 - EN 61158-1:2014 IEC 61158-3-17:2007 NOTE Harmonized as EN 61158-3-17:2008 (not modified). IEC 61158-3-18:2007 NOTE Harmonized as EN 61158-3-18:2008 (not modified). IEC 61158-3-19:2014 NOTE Harmonized as EN 61158-3-19 1) (not modified). IEC 61158-3-20:2014 NOTE Harmonized as EN 61158-3-20 1) (not modified). IEC 61158-3-21:2010 NOTE Harmonized as EN 61158-3-21:2012 (not modified). IEC 61158-3-22:2014 NOTE Harmonized as EN 61158-3-22 1) (not modified). IEC 61158-3-24:2014 NOTE Harmonized as EN 61158-3-24 1) (not modified). IEC 61158-4-1:2014 NOTE Harmonized as EN 61158-4-1 1) (not modified). IEC 61158-4-2:2014 NOTE Harmonized as EN 61158-4-2 1) (not modified). IEC 61158-4-3:2014 NOTE Harmonized as EN 61158-4-3 1) (not modified). IEC 61158-4-4:2014 NOTE Harmonized as EN 61158-4-4 1) (not modified). IEC 61158-4-7:2007 NOTE Harmonized as EN 61158-4-7:2008 (not modified). IEC 61158-4-8:2007 NOTE Harmonized as EN 61158-4-8:2008 (not modified). IEC 61158-4-11:2014 NOTE Harmonized as EN 61158-4-11 1) (not modified). IEC 61158-4-12:2014 NOTE Harmonized as EN 61158-4-12 1) (not modified). IEC 61158-4-13:2014 NOTE Harmonized as EN 61158-4-13 1) (not modified). IEC 61158-4-14:2014 NOTE Harmonized as EN 61158-4-14 1) (not modified). IEC 61158-4-16:2007 NOTE Harmonized as EN 61158-4-16:2008 (not modified). IEC 61158-4-17:2007 NOTE Harmonized as EN 61158-4-17:2008 (not modified). IEC 61158-4-18:2010 NOTE Harmonized as EN 61158-4-18:2012 (not modified). IEC 61158-4-19:2014 NOTE Harmonized as EN 61158-4-19 1) (not modified). IEC 61158-4-20:2014 NOTE Harmonized as EN 61158-4-20 1) (not modified). IEC 61158-4-21:2010 NOTE Harmonized as EN 61158-4-21:2012 (not modified). IEC 61158-4-22:2014 NOTE Harmonized as EN 61158-4-22 1) (not modified). IEC 61158-4-24:2014 NOTE Harmonized as EN 61158-4-24 1) (not modified). IEC 61158-5-2:2014 NOTE Harmonized as EN 61158-5-2 1) (not modified). IEC 61158-5-3:2014 NOTE Harmonized as EN 61158-5-3 1) (not modified). IEC 61158-5-4:2014 NOTE Harmonized as EN 61158-5-4 1) (not modified). IEC 61158-5-5:2014 NOTE Harmonized as EN 61158-5-5 1) (not modified). IEC 61158-5-7:2007 NOTE Harmonized as EN 61158-5-7:2008 (not modified). IEC 61158-5-8:2007 NOTE Harmonized as EN 61158-5-8:2008 (not modified). IEC 61158-5-9:2014 NOTE Harmonized as EN 61158-5-9 1) (not modified). IEC 61158-5-10:2014 NOTE Harmonized as EN 61158-5-10 1) (not modified). IEC 61158-5-11:2007 NOTE Harmonized as EN 61158-5-11:2008 (not modified). IEC 61158-5-12:2014 NOTE Harmonized as EN 61158-5-12 1) (not modified). IEC 61158-5-13:2014 NOTE Harmonized as EN 61158-5-13 1) (not modified). IEC 61158-5-14:2014 NOTE Harmonized as EN 61158-5-14 1) (not modified). IEC 61158-5-15:2010 NOTE Harmonized as EN 61158-5-15:2012 (not modified). IEC 61158-5-16:2007 NOTE Harmonized as EN 61158-5-16:2008 (not modified). IEC 61158-5-17:2007 NOTE Harmonized as EN 61158-5-17:2008 (not modified). IEC 61158-5-18:2010 NOTE Harmonized as EN 61158-5-18:2012 (not modified).
1) To be published. SIST EN 61158-1:2015

1) To be published. SIST EN 61158-1:2015

- 5 - EN 61158-1:2014 IEC 61784-3-18:2011 NOTE Harmonized as EN 61784-3-18:2011 (not modified). IEC 61784-5-1:2013 NOTE Harmonized as EN 61784-5-1:2013 (not modified). IEC 61784-5-2:2013 NOTE Harmonized as EN 61784-5-2:2013 (not modified). IEC 61784-5-3:2013 NOTE Harmonized as EN 61784-5-3:2013 (not modified). IEC 61784-5-4:2010 NOTE Harmonized as EN 61784-5-4:2012 (not modified). IEC 61784-5-6:2013 NOTE Harmonized as EN 61784-5-6:2013 (not modified). IEC 61784-5-8:2013 NOTE Harmonized as EN 61784-5-8:2013 (not modified). IEC 61784-5-10:2010 NOTE Harmonized as EN 61784-5-10:2012 (not modified). IEC 61784-5-11:2013 NOTE Harmonized as EN 61784-5-11:2013 (not modified). IEC 61784-5-12:2010 NOTE Harmonized as EN 61784-5-12:2012 (not modified). IEC 61784-5-13:2013 NOTE Harmonized as EN 61784-5-13:2013 (not modified). IEC 61784-5-14:2013 NOTE Harmonized as EN 61784-5-14:2013 (not modified). IEC 61784-5-15:2010 NOTE Harmonized as EN 61784-5-15:2012 (not modified). IEC 61784-5-16:2013 NOTE Harmonized as EN 61784-5-16:2013 (not modified). IEC 61784-5-17:2013 NOTE Harmonized as EN 61784-5-17:2013 (not modified). IEC 61784-5-18:2013 NOTE Harmonized as EN 61784-5-18:2013 (not modified). IEC 61784-5-19:2013 NOTE Harmonized as EN 61784-5-19:2013 (not modified). IEC 61804 Series NOTE Harmonized as EN 61804 Series (not modified). IEC 61918:2013 NOTE Harmonized as EN 61918:2013 (modified). IEC 62439 Series NOTE Harmonized as EN 62439 Series (not modified). IEC 62453 Series NOTE Harmonized as EN 62453 Series (not modified). IEC 62591 NOTE Harmonized as EN 62591. IEC 62657-2 NOTE Harmonized as EN 62657-2 2). IEC 62734 NOTE Harmonized as EN 62734 2). IEC/TR 62685:2010 NOTE Harmonized as CLC/TR 62685:2011 (not modified).
2) At draft stage. SIST EN 61158-1:2015

IEC 61158-1 Edition 1.0 2014-05 INTERNATIONAL STANDARD NORME INTERNATIONALE Industrial communication networks – Fieldbus specifications – Part 1: Overview and guidance for the IEC 61158 and IEC 61784 series
Réseaux de communication industriels – Spécifications des bus de terrain – Partie 1: Présentation et lignes directrices des séries CEI 61158 et CEI 61784
INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE XC ICS 25.040.40; 33.040; 35.100.05 PRICE CODE CODE PRIX ISBN 978-2-8322-1630-9
– 2 – IEC 61158-1:2014 © IEC 2014 CONTENTS
FOREWORD . 4 1 Scope . 6 2 Normative references . 6 3 Terms, definitions and abbreviated terms . 6
Terms and definitions . 6 3.1 Abbreviations . 7 3.24 Guidelines for implementers and users . 7
Background and purpose . 7 4.1 Supported options . 8 4.2 Benefits from using a common and formal style . 8 4.35 Concept of the IEC 61158 series . 9 6 Mapping onto the OSI Basic Reference Model . 11
Overview . 11 6.1 Physical layer service and protocol. 11 6.2 Data-link layer service . 12 6.3 Data-link layer protocol . 13 6.4 Application layer service . 13 6.5 Application layer protocol . 14 6.67 Structure of IEC 61158 and IEC 61784 series . 15
The IEC 61158 physical layer . 15 7.1 The IEC 61158 data-link layer . 15 7.2 The IEC 61158 application layer . 16 7.3 IEC 61784-1 and IEC 61784-2 fieldbus profiles . 16 7.4 IEC 61784-3 functional safety communication profiles . 20 7.5 IEC 61784-5 installation profiles . 22 7.6 Communication profiles for wireless communication networks . 24 7.78 Brief summary of the characteristics of service and protocol for each fieldbus type . 25
Summary of the physical layer service and protocol characteristics . 25 8.1 Summary of data-link layer service characteristics . 27 8.2 Summary of data-link layer protocol characteristics . 29 8.3 Summary of application layer service characteristics . 30 8.4 Summary of application layer protocol characteristics . 32 8.59 Application layer service description concepts . 34
Overview . 34 9.1 Architectural relationships . 34 9.2 Fieldbus application layer structure . 36 9.3 Fieldbus application layer naming and addressing . 48 9.4 Architecture summary . 49 9.5 Notional FAL service procedures . 50 9.6 Common FAL attributes . 51 9.7 Common FAL service parameters . 52 9.8 APDU size . 53 9.910 Data type ASE . 53
Overview . 53 10.1 Formal definition of data type objects . 55 10.2SIST EN 61158-1:2015

IEC 61158-1:2014 © IEC 2014 – 3 – 11 Fieldbus system requirements . 57
General . 57 11.1 Industrial control network . 57 11.2 Communication between industrial control networks and other networks . 58 11.3 Quality of service features of an industrial control network . 58 11.4 Special requirements for wireless networks . 59 11.5Annex A (informative)
Trade name declarations . 60 Annex B (informative)
Media selection for fieldbus systems . 62 B.1 General . 62 B.2 Cabled media . 62 B.3 Wireless media . 62 B.4 Media needing special consideration . 62 B.5 Performance characteristics of open and public networks . 63 Bibliography . 64
Figure 1 – Example of a fieldbus system . 9 Figure 2 – Concept of DL/AL to separate service and protocol parts . 10 Figure 3 – Basic fieldbus reference model . 11 Figure 4 – General model of physical layer . 12 Figure 5 – Relationship of the Data-link layer to other fieldbus layers and to users of the fieldbus data-link service . 13 Figure 6 – Relationship of the fieldbus Application layer to other fieldbus layers and to users of the fieldbus application service . 14 Figure 7 – Structure of communication profile families . 17 Figure 8 – Example of a CPF structure . 18 Figure 9 – Document structure of IEC 61918 and the CPF specific part of IEC 61784-5 . 24 Figure 10 – Relationship to the OSI Basic Reference Model . 35 Figure 11 – Architectural positioning of the fieldbus application layer . 35 Figure 12 – Client/server interactions . 38 Figure 13 – Pull model interactions . 39 Figure 14 – Push model interactions . 39 Figure 15 – APOs services conveyed by the FAL . 41 Figure 16 – Application entity structure . 43 Figure 17 – Example FAL ASEs . 44 Figure 18 – FAL management of objects . 45 Figure 19 – ASE service conveyance . 46 Figure 20 – Defined and established AREPs . 48 Figure 21 – FAL architectural components . 50 Figure 22 – Data-type class hierarchy example . 53
Table 1 – OSI and IEC 61158 layers . 11 Table 2 – CPF, CP, and type relations . 19 Table 3 – Types of timeliness defined for publisher/subscriber interactions . 40 Table A.1 – Trade names of CPFs and CPs . 60
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FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). 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 Specifications (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 organizations 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 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 Committees 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 National 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 does 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 have 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 whatsoever, 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 publications 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. Attention is drawn to the fact that the use of some of the associated protocol types is restricted by their intellectual-property-right holders. In all cases, the commitment to limited release of intellectual-property-rights made by the holders of those rights permits a layer protocol type to be used with other layer protocols of the same type, or in other type combinations explicitly authorized by their respective intellectual property right holders. NOTE Combinations of protocol types are specified in IEC 61784-1 and IEC 61784-2. International Standard IEC 61158-1 has been prepared by subcommittee 65C: Industrial networks, of IEC technical committee 65: Industrial-process measurement, control and automation. This first edition cancels and replaces the third edition of IEC/TR 61158-1 published in 2010. This edition constitutes a technical revision. SIST EN 61158-1:2015

IEC 61158-1:2014 © IEC 2014 – 5 – This first edition includes the following significant changes with respect to the previous Technical Report: • updates of the references to and information about the IEC 61158 series, IEC 61784-1, IEC 61784-3, IEC 61784-5 series and IEC 61918 throughout the document; • new Type 23 for profile family 8; • new Type 24 and the related profile family CPF 19; • new Subclause 7.7 Communication profiles for wireless communication networks; • new Clause 11 Fieldbus system requirements; • new Annex B Media selection for fieldbus systems. The text of this standard is based on the following documents: FDIS Report on voting 65C/757/FDIS 65C/767/RVD
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 the parts of the IEC 61158 series, published under the general title Industrial communication networks – Fieldbus specifications, can be found on the IEC web site. 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 publication 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 document using a colour printer.
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Part 1: Overview and guidance for the IEC 61158 and IEC 61784 series
1 Scope This document specifies the generic concept of fieldbuses. This document also presents an overview and guidance for the IEC 61158 series by:
• explaining the structure and content of the IEC 61158 series; • relating the structure of the IEC 61158 series to the ISO/IEC 7498-1 OSI Basic Reference Model; • showing the logical structure of the IEC 61784 series; • showing how to use parts of the IEC 61158 series in combination with the IEC 61784 series;
• providing explanations of some aspects of the IEC 61158 series that are common to the type specific parts of the IEC 61158-5 including the application layer service description concepts and the generic fieldbus data types. 2 Normative references None. 3 Terms, definitions and abbreviated terms
Terms and definitions 3.1For the purposes of this document, the following terms and definitions apply.
3.1.1communication system arrangement of hardware, software and propagation media to allow the transfer of messages from one application to another
3.1.2fieldbus communication system based on serial data transfer as typically used in industrial automation and
process control applications
3.1.3fieldbus system system using a fieldbus with connected devices
3.1.4message ordered series of octets intended to convey information [SOURCE: ISO/IEC 2382-16:1996, 16.02.01, modified] SIST EN 61158-1:2015

IEC 61158-1:2014 © IEC 2014 – 7 –
3.1.5network all of the media, connectors, repeaters, routers, gateways and associated node communication elements by which a given set of communicating devices are interconnected
Abbreviations 3.2For the purposes of this document, the following abbreviations, based partially on the concepts developed in ISO/IEC 7498-1, apply: AE application entity AL application layer (N = 7) APDU application layer protocol data unit APO application process object AR application relationship AREP application relationship endpoint ASE application service element CP communication profile CPF communication profile family DL- data-link layer (as a prefix) DLL data-link layer (N = 2) FAL fieldbus application layer FSCP functional safety communication profile IETF Internet Engineering Task Force IO input output IP Internet protocol (see RFC 791) kbit/s thousand bit per second Mbit/s million bit per second LME layer management entity (n)-layer layer n of the OSI basic reference model OSI open systems interconnection Ph- physical layer (as a prefix) PhL physical layer (N = 1) SIL safety integrity level 4 Guidelines for implementers and users
Background and purpose 4.1Communication in global markets requires a global understanding of a specification (standard or not). ISO/OSI related specifications provide a common basis for understanding and acceptance between international experts (manufacturers and end-users).
Examples are • ISO/IEC 7498-1 for general layering and structuring; • ISO/IEC 9545 for general application layer modeling; • ISO/IEC 8886 for data-link layer modeling. SIST EN 61158-1:2015

– 8 – IEC 61158-1:2014 © IEC 2014 The IEC 61158 series specifies a number of different fieldbus types in each of its parts (IEC 61158-2 and the type specific parts of IEC 61158-3-tt, IEC 61158-4-tt, IEC 61158-5-tt and IEC 61158-6-tt). As a result of the editorial harmonization work done by IEC, each PhL, DLL and AL specification within IEC 61158 is shown in a homogeneous way. The description of each layer offers, as far as possible, common views, concepts, definitions, and descriptive methods. NOTE The list of IEC 61158 parts is abbreviated as IEC 61158-3-tt, IEC 61158-4-tt, IEC 61158-5-tt, or IEC 61158-6-tt, where tt represents one or more type numbers.
This common approach has been adopted to assist users and implementers in understanding the several specifications. It is also intended to assist in comparing available products and their communications-related features.
Supported options
4.2Most of the fieldbus types specified in the IEC 61158 series include a range of selectable and configurable options within their detailed specifications. In general, only certain restricted combinations of options will interwork or interoperate correctly. The recommended combinations of options are collected in IEC 61784-1 and IEC 61784-2. IEC 61784-1 and IEC 61784-2 provide users and implementers with details of supported fieldbus specifications based on selected options that are intended to work together consistently and correctly. In most cases, available product demonstrations and working plant experience support these profiles. Annex A of IEC 61784-1 and Annex A of IEC 61784-2 help select the needed fieldbus by showing the key features of each of the profiled fieldbus protocol families. As a result, the route map recommended to select a fieldbus is: • Clause 5 to Clause 8 of this part of IEC 61158; • IEC 61784-1, Annex A: Communication concepts; • IEC 61784-2, Annex A: Performance indicator calculations; • IEC 61784-1 and IEC 61784-2, Communication profile family; • the parts of IEC 61158 as referenced in IEC 61784-1 and IEC 61784-2 for the selected communication profile of interest.
Benefits from using a common and formal style 4.3The benefits gained from using a common and formal style to specify the communication system are: • the common look and feel of a specification saves effort during evaluation; • a common structure helps to identify and to specify common parts and contents; • the common approach represents a first step to ensure long-term quality and stability; • the missing parts and items of any specification are more readily identified by comparison with the other specifications, leading to a simplified review and evaluation procedure; • a common basis facilitates the development of test and certification procedures; • the modular concepts support future enhancements, extensions and adaptation of new technologies. SIST EN 61158-1:2015

IEC 61158-1:2014 © IEC 2014 – 9 – 5 Concept of the IEC 61158 series Conceptually, a fieldbus is an industrial digital communication network for integration of industrial control and instrumentation devices into a system. Examples of such devices are transducers, sensors, actuators and controllers. The IEC 61158 series specifies a number of fieldbus protocol types. Each protocol type is designed to permit multiple measurement and control devices to communicate. Devices communicate directly only with other devices of the same protocol type. The basic requirements of industrial communication networks for measurement and control are given in Clause 11. Devices which use the same lower-layer protocols in a compatible fashion but differ in their higher-layer protocols may be able to share a lower-layer medium. In all cases, a particular data-link layer protocol type may be used without restriction when coupled with physical layer and application layer protocols of the same type or with other combinations as specified in IEC 61784-1 and IEC 61784-2. Use of the various protocol types in other combinations may require permission from their respective copyright holders. The protocol types in IEC 61158 have been engineered to support information processing, monitoring and control systems for any industrial sector and related domains. An example application for high-integrity low-level communication between sensors, actuators and local controllers in a process plant, together with the interconnection of programmable controllers, is shown in Figure 1. Information systemsnetworkGatewayGatewayFieldbussegmentControllers Sensors ActuatorsBridgeFieldbussegmentProcessplantFactoryshopfloorFieldbussegmentProgrammableControllers ProgrammableControllers ProgrammableControllers Monitoringsystem Figure 1 – Example of a fieldbus system A number of fieldbus types are specified in the IEC 61158 series using the following concepts for decomposition. a) First concept: The complex communication task is divided into different layers based on an adaptation of ISO/IEC 7498-1, the ISO/OSI Basic Reference Model, thereby facilitating well-structured functions and interfaces (see Clause 6). This has the following benefits: – decomposition of complex tasks; – modular structure to adapt different technologies. b) Second concept: Each fieldbus type is composed of one or more layer specifications. SIST EN 61158-1:2015

– 10 – IEC 61158-1:2014 © IEC 2014 Most types include a number of services and protocol options that require an appropriate selection to support a working system. Compatible selections of options and services within one of the IEC 61158 fieldbus types are specified as standardized communication profiles in IEC 61784-1 and IEC 61784-2. Most of these profiles are supported by consortia or trade associations which are identified in the profile specification. c) Third concept: The physical, data-link and application layers are described in complementary ways, in terms of the offered services and the protocol which provides those services. Figure 2 illustrates the differences between service and protocol viewpoints of the data-link and application layers. The protocol parts show the layer implementer’s oriented view and the service parts show the layer user’s oriented view. DL servicesPart 3 of IEC 61158-Model and concepts-Service description-Management servicesLayer userOriented viewLayer implementerOriented viewAL servicesPart 5 of IEC 61158-Model and concepts-Data type definitions-Application objects-Service description-Communication end-pointmanagement.AL protocolPart 6 of IEC 61158-Syntax definition and coding-Application relationships procedures-Protocol machines (state machines)DL protocolPart 4 of IEC 61158-Coding-Medium access-Protocol machines (state machines) Figure 2 – Concept of DL/AL to separate service and protocol parts The application layer structure is as follows: – the "what“ is described by application layer service elements (ASE) in the type specific parts of IEC 61158-5; and
– the "how“ is described by application layer relationships (AR) in the type specific parts of IEC 61158-6. The data-link layer structure is as follows: – the "what“ is described by data-link layer services and models in the type specific parts of IEC 61158-3; and
– the "how“ is described by data-link layer protocol machines and medium access principles in the type specific parts of IEC 61158-4. The physical layer is structured similarly, but, because its services are readily described, they are described in IEC 61158-2 together with the definitions of the physical protocols: – the "what“ is described by physical layer services and models, and
– the "how“ is described by physical layer electrical and mechanical specifications. SIST EN 61158-1:2015

IEC 61158-1:2014 © IEC 2014 – 11 – 6 Mapping onto the OSI Basic Reference Model
Overview 6.1IEC 61158 protocol types are described using the principles, methodology and model of ISO/IEC 7498-1. The OSI model provides a layered approach to communications standards, whereby the layers can be developed and modified independently. IEC 61158 specifies functionality from top to bottom of a full OSI stack and, potentially, some functions for the users of the stack. Functions of the intermediate OSI layers, layers 3 through 6, may be consolidated into either the IEC 61158 data-link layer or the IEC 61158 application layer, or may be realized by a separate layer. Likewise, some features common to users of the fieldbus application layer may be provided by the IEC 61158 application layer to simplify user operation. Table 1 shows the OSI layers, their functions, and the equivalent layers in the IEC 61158 basic fieldbus reference model (see Figure 3). Table 1 – OSI and IEC 61158 layers OSI layer Function IEC 61158 layer 7 Application Translates demands placed on the communications stack into a form understood by the lower layers and vice versa Application (IEC 61158-5-tt, IEC 61158-6-tt) 6 Presentation Converts data to/from standardized network formats
↑ 5 Session Creates and manages dialogue among lower layers
↑ 4 Transport Provides transparent reliable data transfer (end-to-end transfer across a network which may include multiple links) ↓ or ↑ 3 Network Performs message routing ↓ or ↑ 2 Data-link Controls access to the communication medium. Performs error detection, (point-to-point transfer on a link) Data-link (IEC 61158-3-tt, IEC 61158-4-tt) 1 Physical Encodes/decodes signals for transmission/reception in a form appropriate to the communications medium. Specifies communication media characteristics Physical (IEC 61158-2) NOTE -tt is a placeholder for the part numbers representing types. NOTE ↓ and ↑ indicate that the functionality of this layer, when present, is included in the fieldbus layer that is nearest in the direction of the arrow. Thus it is possible that the network and transport functionality are included in either the data-link or application layers, and it is possible that the session and presentation functionality are included in the application layer but not in the data-link layer.
Application layer
Systems management
Data-link layer
Physical layer
Medium Figure 3 – Basic fieldbus reference model
Physical layer service and protocol 6.2IEC 61158-2 comprises physical layer specifications corresponding to many of the different DL-Layer protocol types specified in the type specific parts of IEC 61158-4. SIST EN 61158-1:2015

– 12 – IEC 61158-1:2014 © IEC 2014 NOTE 1 The type numbers used are consistent throughout the IEC 61158 series. NOTE 2 Not all types have a physical layer specification in IEC 61158-2. In that case the communication profile in IEC 61784-1 or IEC 61784-2 provides appropriate references to other standards. NOTE 3 For ease of reference, type numbers are given in clause names. This means that the specification given therein applies to this type but does not exclude its use for other types.
NOTE 4 It is up to the user of IEC 61158 to select interoperating sets of provisions. Refer to the IEC 61784-1 and IEC 61784-2 for standardized communication profiles based on IEC 61158 . A general model of the physical layer is shown in Figure 4.
DLL
Ph DIS
DCE Independent Sublayer
Ph MDS
Medium Dependent S
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