SIST EN IEC 61158-5-4:2019
(Main)Industrial communication networks - Fieldbus specifications - Part 5-4: Application layer service definition - Type 4 elements (IEC 61158-5-4:2019)
Industrial communication networks - Fieldbus specifications - Part 5-4: Application layer service definition - Type 4 elements (IEC 61158-5-4:2019)
The 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 part of IEC 61158 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 4 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 Type 4 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 document is to define the services provided to: 1) the FAL user at the boundary between the user and the application layer of the fieldbus reference model, and 2) Systems Management at the boundary between the application layer and Systems Management of the fieldbus reference model. This document specifies the structure and services of the Type 4 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 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 document to provide access to the FAL to control certain aspects of its operation.
Industrielle Kommunikationsnetze - Feldbusse - Teil 5-4: Dienstfestlegungen des Application Layer (Anwendungsschicht) - Typ 4-Elemente (IEC 61158-5-4:2019)
Réseaux de communication industriels - Spécifications des bus de terrain - Partie 5-4 : Définition des services de la couche application - Éléments de type 4 (IEC 61158-5-4:2019)
L’IEC 61158-5-4:2019 fournit des éléments communs pour les communications de messagerie prioritaires et non prioritaires élémentaires entre les programmes d’application des environnements d’automatisation et le matériel spécifique au bus de terrain de type 4. On utilise le terme "prioritaire" pour traduire la présence d’une fenêtre temporelle, à l’intérieur de laquelle il est exigé qu'une ou plusieurs actions spécifiées soient terminées avec un niveau de certitude défini. Si les actions spécifiées ne sont pas réalisées dans la fenêtre temporelle, les applications demandant les actions risquent de connaître une défaillance, avec les risques que cela comporte pour les équipements, les installations et éventuellement la vie humaine.
La présente norme définit de manière abstraite le service visible de l'extérieur fourni par la couche application de bus de terrain de type 4 en termes
a) d’un modèle abstrait pour la définition des ressources d’application (objets) qui peuvent être manipulées par les utilisateurs par l'intermédiaire de l’utilisation du service FAL,
b) des actions primitives et des événements du service;
c) des paramètres associés à chaque action et événement primitif, et de la forme qu’ils peuvent prendre; et
d) des interrelations entre ces actions et événements, et de leurs séquences valides.
Industrijska komunikacijska omrežja - Specifikacije za procesna vodila - 5-4. del: Definicija opravil na aplikacijski ravni - Elementi tipa 4 (IEC 61158-5-4:2019)
Aplikacijski nivo procesnih vodil (FAL) uporabniškim programom omogoča dostop do komunikacijskega okolja procesnih vodil. Glede na to je mogoče aplikacijski nivo procesnih vodil šteti za »okno med ustreznimi aplikacijami«. Ta del standarda IEC 61158 določa skupne elemente za osnovne časovno kritične in časovno nekritične sporočilne komunikacije med aplikacijami v avtomatizacijskem okolju ter material, specifičen za procesna vodila tipa 4. 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 mednarodni standard na abstrakten način določa zunanje vidno opravilo, ki ga zagotavlja aplikacijski nivo procesnih vodil tipa 4 v zvezi s/z: a) abstraktnim modelom za določanje aplikacijskih virov (objektov), ki jih uporabniki lahko spreminjajo prek opravila aplikacijskega nivoja procesnih vodil; b) primitivnimi dejanji in dogodki opravila; c) parametri, povezanimi z vsakim primitivnim dejanjem in dogodkom, kot tudi obliko, ki jo prevzamejo; ter d) medsebojno povezavo med temi dejanji in dogodki ter njihovimi veljavnimi zaporedji. Namen tega dokumenta je opredeliti opravila, ki se zagotavljajo za: 1) uporabnika aplikacijskega nivoja procesnih vodil na meji med uporabnikom in aplikacijskim nivojem referenčnega modela procesnih vodil ter 2) upravljanje sistemov na meji med aplikacijskim nivojem in upravljanje sistemov referenčnega modela procesnih vodil. Ta dokument določa strukturo in opravila aplikacijskega nivoja procesnih vodil tipa 4 v skladu z osnovnim referenčnim modelom OSI (ISO/IEC 7498-1) ter 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 ter 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 dokumentu opredeljena tudi nekatera podporna opravila, da se omogoči dostop do aplikacijskega nivoja procesnih vodil za nadzorovanje nekaterih vidikov njegovega delovanja.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN IEC 61158-5-4:2019
01-november-2019
Nadomešča:
SIST EN 61158-5-4:2015
Industrijska komunikacijska omrežja - Specifikacije za procesna vodila - 5-4. del:
Definicija opravil na aplikacijski ravni - Elementi tipa 4 (IEC 61158-5-4:2019)
Industrial communication networks - Fieldbus specifications - Part 5-4: Application layer
service definition - Type 4 elements (IEC 61158-5-4:2019)
Industrielle Kommunikationsnetze - Feldbusse - Teil 5-4: Dienstfestlegungen des
Application Layer (Anwendungsschicht) - Typ 4-Elemente (IEC 61158-5-4:2019)
Réseaux de communication industriels - Spécifications des bus de terrain - Partie 5-4 :
Définition des services de la couche application - Éléments de type 4 (IEC 61158-5-
4:2019)
Ta slovenski standard je istoveten z: EN IEC 61158-5-4:2019
ICS:
25.040.40 Merjenje in krmiljenje Industrial process
industrijskih postopkov measurement and control
35.100.70 Uporabniški sloj Application layer
35.110 Omreževanje Networking
SIST EN IEC 61158-5-4:2019 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN IEC 61158-5-4:2019
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SIST EN IEC 61158-5-4:2019
EUROPEAN STANDARD EN IEC 61158-5-4
NORME EUROPÉENNE
EUROPÄISCHE NORM
June 2019
ICS 25.040.40; 35.100.70; 35.110 Supersedes EN 61158-5-4:2014
English Version
Industrial communication networks - Fieldbus specifications -
Part 5-4: Application layer service definition - Type 4 elements
(IEC 61158-5-4:2019)
Réseaux de communication industriels - Spécifications des Industrielle Kommunikationsnetze - Feldbusse - Teil 5-4:
bus de terrain - Partie 5-4 : Définition des services de la Dienstfestlegungen des Application Layer
couche application - Éléments de type 4 (Anwendungsschicht) - Typ 4-Elemente
(IEC 61158-5-4:2019) (IEC 61158-5-4:2019)
This European Standard was approved by CENELEC on 2019-05-15. 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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, 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: Rue de la Science 23, B-1040 Brussels
© 2019 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 61158-5-4:2019 E
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SIST EN IEC 61158-5-4:2019
EN IEC 61158-5-4:2019 (E)
European foreword
The text of document 65C/947/FDIS, future edition 3 of IEC 61158-5-4, 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 IEC 61158-5-4:2019.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2020-02-15
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2022-05-15
document have to be withdrawn
This document supersedes EN 61158-5-4:2014.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
Endorsement notice
The text of the International Standard IEC 61158-5-4:2019 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 61158-1:2019 NOTE Harmonized as EN IEC 61158-1:2019 (not modified)
IEC 61158-2 NOTE Harmonized as EN 61158-2
IEC 61784-1:2019 NOTE Harmonized as EN IEC 61784-1:2019 (not modified)
IEC 61784-2:2019 NOTE Harmonized as EN IEC 61784-2:2019 (not modified)
2
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SIST EN IEC 61158-5-4:2019
EN IEC 61158-5-4:2019 (E)
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments)
applies.
NOTE 1 Where 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 61158-3-4 2019 Industrial communication networks - EN IEC 61158-3-4 2019
Fieldbus specifications - Part 3-4: Data-link
layer service definition - Type 4 elements
IEC 61158-4-4 2019 Industrial communication networks - EN IEC 61158-4-4 2019
Fieldbus specifications - Part 4-4: Data-link
layer protocol specification - Type 4
elements
IEC 61158-6-4 2019 Industrial communication networks - EN 61158-6-4 2019
Fieldbus specifications - Part 6-4:
Application layer protocol specification -
Type 4 elements
IEC 61158-6 series Industrial communication networks - EN 61158-6 series
Fieldbus specifications - Part 6-10:
Application layer protocol specification -
Type 10 elements
ISO/IEC 7498-1 - Information technology - Open Systems - -
Interconnection - Basic Reference Model:
The Basic Model
ISO/IEC 7498-3 - Information technology - Open Systems - -
Interconnection - Basic Reference Model:
Naming and addressing
ISO/IEC 8822 - Information technology - Open Systems - -
Interconnection - Presentation service
definition
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
ISO/IEC/IEEE 60559 - Information technology - Microprocessor - -
Systems - Floating-Point arithmetic
3
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SIST EN IEC 61158-5-4:2019
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SIST EN IEC 61158-5-4:2019
IEC 61158-5-4
®
Edition 3.0 2019-04
INTERNATIONAL
STANDARD
colour
inside
Industrial communication networks – Fieldbus specifications –
Part 5-4: Application layer service definition – Type 4 elements
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 25.040.40; 35.100.70; 35.110 ISBN 978-2-8322-6739-4
Warning! Make sure that you obtained this publication from an authorized distributor.
® Registered trademark of the International Electrotechnical Commission
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SIST EN IEC 61158-5-4:2019
– 2 – IEC 61158-5-4:2019 © IEC 2019
CONTENTS
FOREWORD . 5
INTRODUCTION . 7
1 Scope . 8
1.1 General . 8
1.2 Specifications . 9
1.3 Conformance . 9
2 Normative references . 9
3 Terms, definitions, symbols, abbreviations and conventions . 10
3.1 ISO/IEC 7498-1 terms . 10
3.2 ISO/IEC 8822 terms . 10
3.3 ISO/IEC 9545 terms . 10
3.4 ISO/IEC 8824-1 terms . 11
3.5 Fieldbus data-link layer terms . 11
3.6 Fieldbus application layer specific definitions . 11
3.7 Abbreviations and symbols . 17
3.8 Conventions . 18
3.8.1 Overview . 18
3.8.2 General conventions . 19
3.8.3 Conventions for class definitions . 19
3.8.4 Conventions for service definitions . 20
4 Concepts . 21
4.1 Overview . 21
4.2 Architectural relationships . 22
4.2.1 Relationship to the Application Layer of the OSI basic reference model . 22
4.2.2 Relationships to other fieldbus entities . 22
4.3 Fieldbus Application Layer structure . 24
4.3.1 Overview . 24
4.3.2 Fundamental concepts . 24
4.3.3 Fieldbus application processes . 24
4.3.4 Application process objects . 28
4.3.5 Application entities . 30
4.3.6 Fieldbus application service elements . 31
4.3.7 Application relationships . 34
4.4 Fieldbus Application Layer naming and addressing . 36
4.4.1 General . 36
4.4.2 Identifying objects accessed through the FAL . 36
4.4.3 Addressing APs accessed through the FAL . 37
4.5 Architecture summary . 37
4.6 FAL service procedures . 37
4.6.1 FAL confirmed service procedures . 37
4.6.2 FAL unconfirmed service procedures . 38
4.7 Common FAL attributes . 38
4.8 Common FAL service parameters . 39
4.9 APDU size . 39
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5 Type 4 communication model specification . 40
5.1 Concepts . 40
5.1.1 Overview . 40
5.1.2 Application entities . 40
5.1.3 Gateway and routing . 42
5.1.4 Architecture summary . 43
5.1.5 FAL service procedures and time sequence diagrams . 44
5.2 Variable ASE . 46
5.2.1 Variable types . 46
5.2.2 Variable model class specification . 48
5.2.3 Basic variable type specifications . 49
5.2.4 Constructed variable type specifications . 53
5.2.5 Route endpoint ASE . 57
5.2.6 Route endpoint ASE service specification . 60
5.3 Application relationship ASE . 64
5.3.1 Overview . 64
5.3.2 Application relationship class specification . 65
5.3.3 Application relationship ASE service specifications . 66
Bibliography . 71
Figure 1 – Relationship to the OSI basic reference model . 22
Figure 2 – Architectural positioning of the fieldbus Application Layer . 23
Figure 3 – Client/server interactions . 25
Figure 4 – Pull model interactions . 26
Figure 5 – Push model interactions . 27
Figure 6 – APOs services conveyed by the FAL . 29
Figure 7 – Application entity structure . 30
Figure 8 – Example FAL ASEs . 32
Figure 9 – FAL management of objects . 32
Figure 10 – ASE service conveyance . 33
Figure 11 – Defined and established AREPs . 36
Figure 12 – FAL architectural components . 37
Figure 13 – FAL AE . 41
Figure 14 – Summary of the FAL architecture . 43
Figure 15 – FAL service procedure overview. 44
Figure 16 – Time sequence diagram for the confirmed services . 45
Figure 17 – Time sequence diagram for unconfirmed services . 46
Table 1 – REQUEST service parameters . 60
Table 2 – RESPONSE service parameters . 61
Table 3 – Error codes by source . 62
Table 4 – Reserve REP service parameters . 63
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Table 5 – Free AREP service parameters . 63
Table 6 – Get REP attribute service parameters . 63
Table 7 – Set REP attribute service parameters . 64
Table 8 – AR send service parameters . 68
Table 9 – AR acknowledge service parameters . 68
Table 10 – AR get attributes service parameters . 69
Table 11 – AR set attributes service parameters . 69
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SIST EN IEC 61158-5-4:2019
IEC 61158-5-4:2019 © IEC 2019 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
INDUSTRIAL COMMUNICATION NETWORKS –
FIELDBUS SPECIFICATIONS –
Part 5-4: Application layer service definition –
Type 4 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
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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 61158-5-4 has been prepared by subcommittee 65C: Industrial
networks, of IEC technical committee 65: Industrial-process measurement, control and
automation.
This third edition cancels and replaces the second edition published in 2014. This edition
constitutes a technical revision.
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– 6 – IEC 61158-5-4:2019 © IEC 2019
This edition includes the following significant technical changes with respect to the previous
edition:
a) additional user parameters to services;
b) additional services to support distributed objects;
c) additional secure services;
The text of this International Standard is based on the following documents:
FDIS Report on voting
65C/947/FDIS 65C/950/RVD
Full information on the voting for the approval of this International Standard can be found in
the report on voting indicated in the above table.
This publication has been drafted in accordance with ISO/IEC Directives, Part 2.
A list of all the parts of the IEC 61158 series, 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.
A bilingual version of this publication may be issued at a later date.
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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IEC 61158-5-4:2019 © IEC 2019 – 7 –
INTRODUCTION
This document 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 document 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 document is a conceptual architectural
service, independent of administrative and implementation divisions.
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INDUSTRIAL COMMUNICATION NETWORKS –
FIELDBUS SPECIFICATIONS –
Part 5-4: Application layer service definition –
Type 4 elements
1 Scope
1.1 General
The 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 part of IEC 61158 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 4 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 Type 4 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 document is to define the services provided to:
1) the FAL user at the boundary between the user and the application layer of the fieldbus
reference model, and
2) Systems Management at the boundary between the application layer and Systems
Management of the fieldbus reference model.
This document specifies the structure and services of the Type 4 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
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SIST EN IEC 61158-5-4:2019
IEC 61158-5-4:2019 © IEC 2019 – 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 document to provide access to the FAL to control certain aspects of its operation.
1.2 Specifications
The principal objective of this document is to specify the characteristics of conceptual
application layer services suitable f
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