SIST EN 61158-5-24:2015
(Main)Industrial communication networks - Fieldbus specifications - Part 5-24: Application layer service definition - Type-24 elements (IEC 61158-5-24:2014)
Industrial communication networks - Fieldbus specifications - Part 5-24: Application layer service definition - Type-24 elements (IEC 61158-5-24:2014)
IEC 61158-5-24:2014 defines the services provided to the FAL user at the boundary between the user and the application layer of the fieldbus reference model, and Systems Management at the boundary between the application layer and Systems Management of the fieldbus reference model. This standard specifies the structure and services of the IEC fieldbus application layer, in conformance with the OSI Basic Reference Model (ISO/IEC 7498-1) and the OSI application layer structure (ISO/IEC 9545).
Industrielle Kommunikationsnetze - Feldbusse - Teil 5-24: Dienstfestlegungen des Application Layer (Anwendungsschicht) - Typ 24-Elemente (IEC 61158-5-24:2014)
Réseaux de communication industriels - Spécifications des bus de terrain - Partie 5-24: Définition des services de la couche application - Éléments de type 24 (CEI 61158-5-24:2014)
L'IEC 61158-5-24:2014 défini les services mis en place pour l'utilisateur de FAL, à la frontière entre l'utilisateur et la couche application du modèle de référence de bus de terrain; et la Gestion des systèmes, à la frontière entre la couche application et la Gestion des systèmes selon le modèle de référence de bus de terrain. La présente norme spécifie la structure et les services de la couche application de bus de terrain IEC, en conformité avec le modèle de référence de base de l'OSI (ISO/CEI 7498-1) et la structure de la couche application de l'OSI (ISO/CEI 9545).
Industrijska komunikacijska omrežja - Specifikacije za procesna vodila - 5-24. del: Definicija opravil na aplikacijski ravni - Elementi tipa 24 (IEC 61158-5-24:2014)
Aplikacijski nivo procesnih vodil (FAL) omogoča uporabniškim programom dostop do komunikacijskega okolja procesnih vodil. Glede na to je mogoče aplikacijski nivo procesnih vodil šteti za »okno med ustreznimi aplikacijami«.
Ta standard določa skupne elemente za osnovne časovno kritične in časovno nekritične sporočilne komunikacije med aplikacijami v avtomatizacijskem okolju in material, specifičen za procesna vodila tipa 12. Izraz »časovno kritičen« se uporablja za predstavitev prisotnosti časovnega okna, v okviru katerega se zahteva dokončanje enega ali več opredeljenih dejanj z določeno stopnjo gotovosti. Zaradi neuspešnega dokončanja opredeljenih dejanj v časovnem oknu je možna odpoved aplikacij, ki zahtevajo dejanja, pri čemer so ogroženi oprema, obrat in morda človeška življenja.
Ta standard na abstrakten način določa na zunaj vidno opravilo, ki ga zagotavljajo različne vrste aplikacijske ravni procesnih vodil v smislu a) abstraktnega modela za določanje aplikacijskih virov (objektov), ki ga lahko upravljajo uporabniki prek opravila FAL,
b) primitivnih dejanj in dogodkov opravila;
c) parametrov, povezanih z vsakim primitivnim dejanjem in dogodkom, ter obliko, ki jo prevzamejo; in
d) medsebojne povezave med temi dejanji in dogodki ter njihovimi veljavnimi zaporedji.
Namen tega standarda je določiti opravila, ki se zagotavljajo za
a) uporabnika aplikacijskega nivoja procesnih vodil na meji med uporabnikom in referenčnim modelom aplikacijskega nivoja procesnega vodila, in
b) upravljanje sistemov na meji med aplikacijskim nivojem in upravljanjem sistemov
za referenčni model procesnega vodila.
Ta standard določa strukturo in opravila aplikacijskega nivoja procesnih vodil IEC v skladu z osnovnim referenčnim modelom OSI (ISO/IEC 7498-1) in strukturo aplikacijskega nivoja OSI (ISO/IEC 9545).
Opravila in protokole aplikacijskega nivoja procesnih vodil zagotavljajo aplikacijski osebki (AE) aplikacijskega nivoja procesnih vodil znotraj aplikacijskih procesov. Aplikacijski osebek aplikacijskega nivoja procesnih vodil sestavljata sklop objektno usmerjenih aplikacijskih opravilnih elementov (ASE) in osebek za upravljanje nivojev (LME), ki upravlja aplikacijski osebek. Aplikacijski opravilni elementi zagotavljajo komunikacijska opravila, ki delujejo na sklopu povezanih razredov objektov aplikacijskega procesa (APO). Med aplikacijske opravilne elemente aplikacijskega nivoja procesnih vodil spada aplikacijski opravilni element za upravljanje, ki zagotavlja skupen sklop opravil za upravljanje primerkov razredov aplikacijskega nivoja procesnih vodil. Čeprav ta opravila določajo način izdajanja in dostavljanja zahtev in odzivov z vidika aplikacij, ne zajemajo specifikacije v zvezi s tem, kako naj se nanje odzovejo aplikacije, ki te zahteve in odzive oddajajo. To pomeni, da vedenjski vidiki aplikacij niso opredeljeni; opredeljena je le definicija zahtev in odzivov, ki jih lahko pošiljajo/prejemajo. Tako se uporabnikom aplikacijskega nivoja procesnih vodil omogoči večja prilagodljivost pri standardizaciji takega vedenja objektov. Poleg teh opravil so v tem standardu opredeljena tudi nekatera podporna opravila, da se omogoči dostop do aplikacijskega nivoja procesnih vodil za nadzorovanje nekaterih vidikov njegovega delovanja.
General Information
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Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Industrijska komunikacijska omrežja - Specifikacije za procesna vodila - 5-24. del: Definicija opravil na aplikacijski ravni - Elementi tipa 24 (IEC 61158-5-24:2014)Industrielle Kommunikationsnetze - Feldbusse - Teil 5-24: Dienstfestlegungen des Application Layer (Anwendungsschicht) - Typ 24-Elemente (IEC 61158-5-24:2014)Réseaux de communication industriels - Spécifications des bus de terrain - Partie 5-24: Définition des services de la couche application - Éléments de type 24 (CEI 61158-5-24:2014)Industrial communication networks - Fieldbus specifications - Part 5-24: Application layer service definition - Type-24 elements (IEC 61158-5-24:2014)35.110OmreževanjeNetworking35.100.70Uporabniški slojApplication layer25.040.40Merjenje in krmiljenje industrijskih postopkovIndustrial process measurement and controlICS:Ta slovenski standard je istoveten z:EN 61158-5-24:2014SIST EN 61158-5-24:2015en,fr,de01-marec-2015SIST EN 61158-5-24:2015SLOVENSKI
STANDARD
SIST EN 61158-5-24:2015
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 61158-5-24
October 2014 ICS 25.040.40; 35.100.70; 35.110
English Version
Industrial communication networks - Fieldbus specifications - Part 5-24: Application layer service definition - Type-24 elements (IEC 61158-5-24:2014)
Réseaux de communication industriels - Spécifications des bus de terrain - Partie 5-24: Définition des services de la couche application - Éléments de type 24 (CEI 61158-5-24:2014)
Industrielle Kommunikationsnetze - Feldbusse -
Teil 5-24: Dienstfestlegungen des Application Layer (Anwendungsschicht) - Typ 24-Elemente (IEC 61158-5-24:2014) This European Standard was approved by CENELEC on 2014-09-22. 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 61158-5-24:2014 E SIST EN 61158-5-24:2015
EN 61158-5-24:2014 - 2 - Foreword The text of document 65C/763/FDIS, future edition 1 of IEC 61158-5-24, prepared by SC 65C “Industrial networks” of IEC/TC 65 “Industrial-process measurement, control and automation" was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as EN 61158-5-24:2014.
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) 2015-06-22 • latest date by which the national standards conflicting with the document have to be withdrawn (dow) 2017-09-22
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 61158-5-24:2014 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 61784-1 NOTE Harmonized as EN 61784-1. IEC 61784-2 NOTE Harmonized as EN 61784-2. SIST EN 61158-5-24:2015
- 3 - EN 61158-5-24:2014 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, 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 information 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 61158-1 2014
Industrial communication networks - Fieldbus specifications -
Part 1: Overview and guidance for the IEC 61158 and IEC 61784 series EN 61158-1 2014 IEC 61158-6-24 2014
Industrial communication networks - Fieldbus specifications -
Part 6-24: Application layer protocol specification - Type-24 Elements EN 61158-6-24 1) -
ISO/IEC 7498-1 -
Information technology - Open Systems Interconnection - Basic reference model: The basic model - -
ISO/IEC 8824-1 -
Information technology - Abstract Syntax Notation One (ASN.1): Specification of basic notation - -
ISO/IEC 9545 -
Information technology - Open Systems Interconnection - Application layer structure - -
ISO/IEC 10731 -
Information technology - Open Systems Interconnection - Basic Reference Model - Conventions for the definition of OSI services - -
1) To be published. SIST EN 61158-5-24:2015
SIST EN 61158-5-24:2015
IEC 61158-5-24 Edition 1.0 2014-08 INTERNATIONAL STANDARD NORME INTERNATIONALE Industrial communication networks – Fieldbus specifications –
Part 5-24: Application layer service definition – Type-24 elements
Réseaux de communication industriels – Spécifications des bus de terrain –
Partie 5-24: Définition des services de la couche application – Éléments
de type 24
INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE XD ICS 25.040.40; 35.100.70; 35.110 PRICE CODE CODE PRIX ISBN 978-2-8322-1744-3
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale ®
Warning! Make sure that you obtained this publication from an authorized distributor.
Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé. SIST EN 61158-5-24:2015
– 2 – IEC 61158-5-24:2014 © IEC 2014 CONTENTS FOREWORD . 5 INTRODUCTION . 7 1 Scope . 8
General . 8 1.1 Specifications . 9 1.2 Conformance . 9 1.32 Normative references . 9 3 Terms, definitions, symbols, abbreviations, and conventions . 10
Referenced terms and definitions . 10 3.1 Additional terms and definitions . 10 3.2 Abbreviations and symbols . 15 3.3 Conventions . 17 3.44 Concepts . 19 5 Data type ASE . 20 6 Communication model specifications . 20
Type specific concepts . 20 6.1 Overview . 20 6.2 FSM ASE . 23 6.3 FAL ASEs. 29 6.4 FAL ARs . 70 6.5Bibliography . 95
Figure 1 – FAL ASE model of Type 24 . 22 Figure 2 – AR model for field device control service . 72 Figure 3 – AR model for message service . 72 Figure 4 – MSG ARs between each APs . 73
Table 1 – AP type definition . 21 Table 2 – Support list of service for each class of FSM ASE . 24 Table 3 – FSM-Reset . 25 Table 4 – FSM-GetStatus . 26 Table 5 – FSM-SetContext . 27 Table 6 – FSM-GetContext . 28 Table 7 – FSM-Start . 28 Table 8 – Support list of service for each class of FDC ASE . 29 Table 9 – FDC-Reset for master class . 33 Table 10 – FDC-Open for master class . 33 Table 11 – FDC-Enable for master class . 34 Table 12 – FDC-Connect for master class . 34 Table 13 – FDC-SyncSet for master class . 35 Table 14 – FDC-Disconnect for master class . 36 Table 15 – FDC-ResumeCycle for master class . 37 Table 16 – FDC-ComCycle for master class . 37 SIST EN 61158-5-24:2015
IEC 61158-5-24:2014 © IEC 2014 – 3 – Table 17 – FDC-Command for master class . 38 Table 18 – FDC-DataExchange for master class . 39 Table 19 – FDC-Reset for slave class . 42 Table 20 – FDC-Open for slave class . 43 Table 21 – FDC-Enable for slave class . 43 Table 22 – FDC-Connect for slave class . 44 Table 23 – FDC-SyncSet for slave class . 45 Table 24 – FDC-Disconnect for slave class . 46 Table 25 – FDC-ResumeCycle for slave class . 47 Table 26 – FDC-ComCycle for slave class . 47 Table 27 – FDC-Command for slave class . 48 Table 28 – FDC-Command for slave class . 49 Table 29 – FDC-Reset for monitor class . 51 Table 30 – FDC-Open for monitor class . 51 Table 31 – FDC-Enable for monitor class . 52 Table 32 – FDC-GetCMD for monitor class . 52 Table 33 – FDC-GetRSP for monitor class . 53 Table 34 – Support list of service for each class of Message ASE . 54 Table 35 – MSG-Reset for requester class . 56 Table 36 – MSG-Open for requester class . 57 Table 37 – MSG-Enable for requester class . 57 Table 38 – MSG-UserMessage for requester class . 58 Table 39 – MSG-OnewayMessage for requester class . 59 Table 40 – MSG-AbortTransaction for requester class . 61 Table 41 – MSG-Reset for responder class . 62 Table 42 – MSG-Open for responder class . 63 Table 43 – MSG-Enable for responder class . 63 Table 44 – MSG-UserMessage for responder class . 64 Table 45 – MSG-OnewayMessage for responder class . 65 Table 46 – MSG-AbortTransaction for responder class . 66 Table 47 – Support list of service for each class of Event Management ASE. 67 Table 48 – EVM-Reset . 68 Table 49 – EVM-Enable . 68 Table 50 – EVM-SyncEvent . 69 Table 51 – EVM-ReadNetClock . 69 Table 52 – Support list of service for each class of AR ASE . 70 Table 53 – AR-Reset for FDC Master AR class . 75 Table 54 – AR-Open for FDC Master AR class . 76 Table 55 – AR-Enable for FDC Master AR class . 76 Table 56 – AR-CycleEvent for FDC Master AR class. 77 Table 57 – AR-StartComCycle for FDC Master AR class . 77 Table 58 – AR-ResetCycle for FDC Master AR class . 78 Table 59 – AR-SendCommand for FDC Master AR class . 78 SIST EN 61158-5-24:2015
– 4 – IEC 61158-5-24:2014 © IEC 2014 Table 60 – AR-Reset for FDC Slave AR class . 81 Table 61 – AR-Open for FDC Slave AR class . 81 Table 62 – AR-Enable for FDC Slave AR class . 82 Table 63 – AR-CycleEvent for FDC Slave AR class . 82 Table 64 – AR-StartComCycle for FDC Slave AR class . 83 Table 65 – AR-ResetCycle for FDC Slave AR class . 83 Table 66 – AR-SendCommand for FDC Slave AR class . 84 Table 67 – AR-Reset for FDC Monitor AR class . 86 Table 68 – AR-Open for FDC Monitor AR class . 86 Table 69 – AR-Enable for FDC Monitor AR class . 87 Table 70 – AR-GetCMD for FDC Monitor AR class . 88 Table 71 – AR-GetCMD for FDC Monitor AR class . 88 Table 72 – AR-Reset for Message AR class . 90 Table 73 – AR-Open for Message AR class . 91 Table 74 – AR-Enable for Message AR class . 92 Table 75 – AR-SendMessage for Message AR class . 92 Table 76 – AR-ReceiveMessage for Message AR class . 93 Table 77 – AR-AbortMessage for Message AR class . 94
SIST EN 61158-5-24:2015
IEC 61158-5-24:2014 © IEC 2014 – 5 – INTERNATIONAL ELECTROTECHNICAL COMMISSION ____________
INDUSTRIAL COMMUNICATION NETWORKS –
FIELDBUS SPECIFICATIONS –
Part 5-24: Application layer service definition –
Type-24 elements
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 the associated protocol type is restricted by its 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 its intellectual-property-right holders. NOTE Combinations of protocol types are specified in IEC 61784-1 and IEC 61784-2. International Standard IEC 61158-5-24 has been prepared by subcommittee 65C: Industrial networks, of IEC technical committee 65: Industrial-process measurement, control and automation.
SIST EN 61158-5-24:2015
– 6 – IEC 61158-5-24:2014 © IEC 2014 The text of this standard is based on the following documents: FDIS Report on voting 65C/763/FDIS 65C/773/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 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.
SIST EN 61158-5-24:2015
IEC 61158-5-24:2014 © IEC 2014 – 7 – INTRODUCTION This part of IEC 61158 is one of a series produced to facilitate the interconnection of automation system components. It is related to other standards in the set as defined by the “three-layer” fieldbus reference model described in IEC 61158-1. The application service is provided by the application protocol making use of the services available from the data-link or other immediately lower layer. This standard defines the application service characteristics that fieldbus applications and/or system management may exploit. Throughout the set of fieldbus standards, the term “service” refers to the abstract capability provided by one layer of the OSI Basic Reference Model to the layer immediately above. Thus, the application layer service defined in this standard is a conceptual architectural service, independent of administrative and implementation divisions.
SIST EN 61158-5-24:2015
– 8 – IEC 61158-5-24:2014 © IEC 2014 INDUSTRIAL COMMUNICATION NETWORKS –
FIELDBUS SPECIFICATIONS –
Part 5-24: Application layer service definition –
Type-24 elements
1 Scope
General 1.1The fieldbus application layer (FAL) provides user programs with a means to access the fieldbus communication environment. In this respect, the FAL can be viewed as a “window between corresponding application programs.” This International Standard provides common elements for basic time-critical and non-time-critical messaging communications between application programs in an automation environment and material specific to Type 24 fieldbus. The term “time-critical” is used to represent the presence of a time-window, within which one or more specified actions are required to be completed with some defined level of certainty. Failure to complete specified actions within the time window risks failure of the applications requesting the actions, with attendant risk to equipment, plant and possibly human life. This International Standard defines in an abstract way the externally visible service provided by the different Types of fieldbus Application Layer in terms of a) an abstract model for defining application resources (objects) capable of being manipulated by users via the use of the FAL service, b) the primitive actions and events of the service, c) the parameters associated with each primitive action and event, and the form which they take, and d) the interrelationship between these actions and events, and their valid sequences. The purpose of this International Standard is to define the services provided to a) the FAL user at the boundary between the user and the Application Layer of the Fieldbus Reference Model, and b) Systems Management at the boundary between the Application Layer and Systems Management of the Fieldbus Reference Model. This International Standard specifies the structure and services of the IEC fieldbus Application Layer, in conformance with the OSI Basic Reference Model (ISO/IEC 7498-1) and the OSI Application Layer Structure (ISO/IEC 9545). FAL services and protocols are provided by FAL application-entities (AE) contained within the application processes. The FAL AE is composed of a set of object-oriented Application Service Elements (ASEs) and a Layer Management Entity (LME) that manages the AE. The ASEs provide communication services that operate on a set of related application process object (APO) classes. One of the FAL ASEs is a management ASE that provides a common set of services for the management of the instances of FAL classes. Although these services specify, from the perspective of applications, how request and responses are issued and delivered, they do not include a specification of what the requesting and responding applications are to do with them. That is, the behavioral aspects of the applications are not specified; only a definition of what requests and responses they can SIST EN 61158-5-24:2015
IEC 61158-5-24:2014 © IEC 2014 – 9 – send/receive is specified. This permits greater flexibility to the FAL users in standardizing such object behavior. In addition to these services, some supporting services are also defined in this International Standard to provide access to the FAL to control certain aspects of its operation.
Specifications 1.2The principal objective of this standard is to specify the characteristics of conceptual application layer services suitable for time-critical communications, and thus supplement the OSI Basic Reference Model in guiding the development of application layer protocols for time-critical communications. A secondary objective is to provide migration paths from previously-existing industrial communications protocols. It is this latter objective which gives rise to the diversity of services standardized as the various Types of IEC 61158, and the corresponding protocols standardized in subparts of IEC 61158-6. This specification may be used as the basis for formal Application Programming-Interfaces. Nevertheless, it is not a formal programming interface, and any such interface will need to address implementation issues not covered by this specification, including a) the sizes and octet ordering of various multi-octet service parameters, and b) the correlation of paired request and confirm, or indication and response, primitives.
Conformance 1.3This standard does not specify individual implementations or products, nor do they con
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