SIST EN 61158-5-22:2015
(Main)Industrial communication networks - Fieldbus specifications - Part 5-22: Application layer service definition - Type 22 elements (IEC 61158-5-22:2014)
Industrial communication networks - Fieldbus specifications - Part 5-22: Application layer service definition - Type 22 elements (IEC 61158-5-22:2014)
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 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 22 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 standard defines in an abstract way the externally visible service provided by the 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 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 standard specifies the structure and services of the 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.
Industrielle Kommunikationsnetze - Feldbusse - Teil 5-22: Dienstfestlegungen des Application Layer (Anwendungsschicht) - Typ 22-Elemente (IEC 61158-5-22:2014)
Réseaux de communication industriels - Spécifications des bus de terrain - Partie 5-22: Définition des services de la couche application - Éléments de type 22 (CEI 61158-5-22:2014)
L'IEC 61158-5-22:2014 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). Cette deuxième édition annule et remplace la première édition parue en 2010. Elle constitue une révision technique. Cette édition inclut les modifications suivantes: adoption des dates de révision des normes citées.
Industrijska komunikacijska omrežja - Specifikacije za procesna vodila - 5-22. del: Definicija opravil na aplikacijski ravni - Elementi tipa 22 (IEC 61158-5-22:2014)
Aplikacijski nivo procesnih vodil (FAL) omogoča uporabniškim programom dostop do komunikacijskega okolja procesnih vodil. V tem smislu je mogoče aplikacijski nivo procesnih vodil obravnavati kot »okno med ustreznimi aplikacijami«. Ta standard določa skupne elemente za osnovne časovno kritične in časovno nekritične sporočilne komunikacije med aplikacijami v avtomatizacijskem okolju in materialu, specifičnem za procesna vodila tipa 22. 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 zagotavlja aplikacijski nivo 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 FAL 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 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.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 61158-5-22:2015
01-marec-2015
1DGRPHãþD
SIST EN 61158-5-22:2012
Industrijska komunikacijska omrežja - Specifikacije za procesna vodila - 5-22. del:
Definicija opravil na aplikacijski ravni - Elementi tipa 22 (IEC 61158-5-22:2014)
Industrial communication networks - Fieldbus specifications - Part 5-22: Application layer
service definition - Type 22 elements (IEC 61158-5-22:2014)
Industrielle Kommunikationsnetze - Feldbusse - Teil 5-22: Dienstfestlegungen des
Application Layer (Anwendungsschicht) - Typ 22-Elemente (IEC 61158-5-22:2014)
Réseaux de communication industriels - Spécifications des bus de terrain - Partie 5-22:
Définition des services de la couche application - Éléments de type 22 (CEI 61158-5-
22:2014)
Ta slovenski standard je istoveten z: EN 61158-5-22:2014
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 61158-5-22:2015 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 61158-5-22:2015
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SIST EN 61158-5-22:2015
EUROPEAN STANDARD EN 61158-5-22
NORME EUROPÉENNE
EUROPÄISCHE NORM
October 2014
ICS 25.040.40; 35.100.70; 35.110 Supersedes EN 61158-5-22:2012
English Version
Industrial communication networks - Fieldbus specifications -
Part 5-22: Application layer service definition - Type 22 elements
(IEC 61158-5-22:2014)
Réseaux de communication industriels - Spécifications des Industrielle Kommunikationsnetze - Feldbusse -
bus de terrain - Partie 5-22: Définition des services de la Teil 5-22: Dienstfestlegungen des Application Layer
couche application - Éléments de type 22 (Anwendungsschicht) - Typ 22-Elemente
(CEI 61158-5-22:2014) (IEC 61158-5-22:2014)
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 61158-5-22:2014 E
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SIST EN 61158-5-22:2015
EN 61158-5-22:2014 - 2 -
Foreword
The text of document 65C/763/FDIS, future edition 2 of IEC 61158-5-22, 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 61158-5-22:2014.
The following dates are fixed:
• latest date by which the document has to be (dop) 2015-06-22
implemented at national level by
publication of an identical national
standard or by endorsement
(dow) 2017-09-22
• latest date by which the national
standards conflicting with the
document have to be withdrawn
This document supersedes EN 61158-5-22:2012.
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 61158-5-22:2014 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.
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SIST EN 61158-5-22:2015
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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 61131-3 - Programmable controllers - EN 61131-3 -
Part 3: Programming languages
IEC 61158-1 2014 Industrial communication networks - EN 61158-1 2014
Fieldbus specifications -
Part 1: Overview and guidance for the
IEC 61158 and IEC 61784 series
1)
IEC 61158-4-22 2014 Industrial communication networks - EN 61158-4-22 -
Fieldbus specifications -
Part 4-22: Data-link layer protocol
specification - Type 22 elements
1)
IEC 61158-6-22 - Industrial communication networks - EN 61158-6-22 -
Fieldbus specifications -
Part 6-22: Application layer protocol
specification - Type 22 elements
ISO/IEC 646 - Information technology - ISO 7-bit coded - -
character set for information interchange
ISO/IEC 7498-1 - Information technology - Open Systems - -
Interconnection - Basic reference model:
The basic model
ISO/IEC 8802-3 - Information technology - - -
Telecommunications and information
exchange between systems - Local and
metropolitan area networks - Specific
requirements -
Part 3: Carrier sense multiple access with
collision detection (CSMA/CD) access
method and physical layer specifications
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
1)
To be published.
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SIST EN 61158-5-22:2015
EN 61158-5-22:2014 - 4 -
Publication Year Title EN/HD Year
ISO/IEC 9545 - Information technology - Open Systems - -
Interconnection - Application layer
structure
ISO/IEC 10646 - Information technology - Universal Coded - -
Character Set (UCS)
ISO/IEC 10731 - Information technology - Open Systems - -
Interconnection - Basic Reference Model -
Conventions for the definition of OSI
services
ISO/IEC/IEEE - Information technology - Microprocessor - -
60559 Systems - Floating-Point arithmetic
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SIST EN 61158-5-22:2015
IEC 61158-5-22
®
Edition 2.0 2014-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Industrial communication networks – Fieldbus specifications –
Part 5-22: Application layer service definition – Type 22 elements
Réseaux de communication industriels – Spécifications des bus de terrain –
Partie 5-22: Définition des services de la couche application – Éléments
de type 22
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX XC
ICS 25.040.40; 35.100.70; 35.110 ISBN 978-2-8322-1742-9
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.
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
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SIST EN 61158-5-22:2015
– 2 – IEC 61158-5-22:2014 © IEC 2014
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
1.1 General . 7
1.2 Specifications . 8
1.3 Conformance . 8
2 Normative references . 8
3 Terms, definitions, abbreviations, symbols and conventions . 9
3.1 ISO/IEC 7498-1 terms . 9
3.2 ISO/IEC 8822 terms . 9
3.3 ISO/IEC 9545 terms . 9
3.4 ISO/IEC 8824-1 terms . 10
3.5 Type 22 fieldbus application-layer specific definitions . 10
3.6 Abbreviations and symbols . 13
3.7 Conventions . 15
4 Concepts . 18
4.1 Common concepts . 18
4.2 Type specific concepts . 18
5 Data type ASE . 22
5.1 Overview . 22
5.2 Formal definition of data type objects . 22
5.3 FAL defined data types . 22
6 Communication model specification . 30
6.1 Application service elements (ASEs) . 30
6.2 Application relationships (ARs) . 71
Bibliography . 76
Figure 1 – Producer-consumer interaction model . 20
Figure 2 – RTFL device reference model . 21
Figure 3 – RTFN device reference model . 22
Figure 4 – Type 22 CeS device structure . 31
Figure 5 – Successful SDO expedited download sequence . 44
Figure 6 – Successful SDO normal download initialization sequence . 44
Figure 7 – Successful SDO download sequence . 44
Figure 8 – Successful SDO expedited upload sequence. 45
Figure 9 – Successful SDO normal upload initialization sequence . 45
Figure 10 – Successful SDO upload sequence . 45
Figure 11 – Failed SDO expedited download initialization sequence . 46
Figure 12 – Failed SDO download after initialization sequence . 46
Figure 13 – Failed SDO download sequence . 47
Figure 14 – Emergency sequence . 47
Figure 15 – Heartbeat sequence . 48
Figure 16 – Process data write sequence. 48
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IEC 61158-5-22:2014 © IEC 2014 – 3 –
Figure 17 – PDO mapping principle . 49
Figure 18 – Process data object . 49
Figure 19 – SEF service sequence. 62
Table 1 – Object dictionary structure . 31
Table 2 – Initiate SDO expedited download service . 52
Table 3 – Initiate SDO normal download service . 53
Table 4 – SDO download service . 54
Table 5 – Initiate SDO expedited upload service . 55
Table 6 – Initiate SDO normal upload service . 57
Table 7 – SDO upload service . 58
Table 8 – SDO abort service . 59
Table 9 – Process data write service. 60
Table 10 – Emergency service (EMCY) . 60
Table 11 – Heartbeat service . 61
Table 12 – Send frame service . 63
Table 13 – AL-Network verification service . 65
Table 14 – AL-RTFL configuration service . 65
Table 15 – AL-DelayMeasurement start service . 67
Table 16 – AL-DelayMeasurement read service . 67
Table 17 – PCS configuration service . 68
Table 18 – MII read service . 68
Table 19 – MII write service . 68
Table 20 – AL-RTFN scan network read service . 69
Table 21 – Application layer management service . 70
Table 22 – Start synchronization service . 70
Table 23 – Stop synchronization service . 71
Table 24 – PTPNSU AREP class . 73
Table 25 – PTMNSU AREP class . 73
Table 26 – PTPNSC AREP class . 73
Table 27 – PTPUTC AREP class. 74
Table 28 – FAL services by AREP class . 74
Table 29 – FAL services by AREP role . 75
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INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
INDUSTRIAL COMMUNICATION NETWORKS –
FIELDBUS SPECIFICATIONS –
Part 5-22: Application layer service definition –
Type 22 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 61158-5-22 has been prepared by subcommittee 65C: Industrial
networks, of IEC technical committee 65: Industrial-process measurement, control and
automation.
This second edition cancels and replaces the first edition published in 2010. This edition
constitutes a technical revision.
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SIST EN 61158-5-22:2015
IEC 61158-5-22:2014 © IEC 2014 – 5 –
This edition includes the following technical changes with respect to the previous edition.
• Adopted revisions dates of cited standards.
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 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 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.
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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.
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SIST EN 61158-5-22:2015
IEC 61158-5-22:2014 © IEC 2014 – 7 –
INDUSTRIAL COMMUNICATION NETWORKS –
FIELDBUS SPECIFICATIONS –
Part 5-22: Application layer service definition –
Type 22 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 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 22 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 standard defines in an abstract way the externally visible service provided by the 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 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 standard specifies the structure and services of the 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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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 standard to provide access to the FAL to control certain aspects of its operation.
1.2 Specifications
The 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.
1.3 Conformance
This standard does not specify individual implementations or products, nor does it constrain
the implementations of application layer entities within industrial automation systems.
There is no conformance of equipment to this application layer service definition standard.
Instead, conformance is achieved through implementation of conforming application layer
protocols that fulfill the application layer services as defined in this standard.
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 refe
...
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