EN 61158-5-22:2014

Industrial communication networks - Fieldbus specifications - Part 5-22: Application layer service definition - Type 22 elements

IEC 61158-5-22:2014 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). This second edition cancels and replaces the first edition published in 2010 and constitutes a technical revision. The main changes are: adopted revisions dates of cited standards.

Industrielle Kommunikationsnetze - Feldbusse - Teil 5-22: Dienstfestlegungen des Application Layer (Anwendungsschicht) - Typ 22-Elemente

Réseaux de communication industriels - Spécifications des bus de terrain - Partie 5-22: Définition des services de la couche application - Éléments de type 22

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

• Status: Published
• Publication Date: 16-Oct-2014
• Withdrawal Date: 21-Sep-2017
• ICS: 25.040.40 - Industrial process measurement and control
• ICS: 35.100.70 - Application layer
• ICS: 35.110 - Networking
• Technical Committee: CLC/TC 65X - Industrial-process measurement, control and automation
• Drafting Committee: IEC/SC 65C - IEC_SC_65C
• Current Stage: 6060 - Document made available - Publishing
• Start Date: 17-Oct-2014
• Completion Date: 17-Oct-2014
• Mandate: M/490 - Standardisation mandate to the European Standardisation Organisations (ESOs) to support European Smart Grid deployment
• Ref Project: SIST EN 61158-5-22:2015 - Industrial communication networks - Fieldbus specifications - Part 5-22: Application layer service definition - Type 22 elements (IEC 61158-5-22:2014)

Relations

• Replaces: EN 61158-5-22:2012 - Industrial communication networks - Fieldbus specifications - Part 5-22: Application layer service definition - Type 22 elements
• Effective Date: 23-Jan-2023
• Parent: EN 61158-5-2:2014 - Industrial communication networks - Fieldbus specifications - Part 5-2: Application layer service definition - Type 2 elements
• Effective Date: 07-Jun-2022
• Parent: EN 61158-5-2:2014 - Industrial communication networks - Fieldbus specifications - Part 5-2: Application layer service definition - Type 2 elements
• Effective Date: 23-Mar-2020

Overview

EN 61158-5-22:2014 (identical to IEC 61158-5-22:2014) is a fieldbus standard for industrial communication networks that defines the application layer service definition for Type 22 elements. It specifies the structure and services provided at the Fieldbus Application Layer (FAL) boundary between the user and the application layer, and the interface to Systems Management. The standard aligns with the OSI Basic Reference Model (ISO/IEC 7498-1) and the OSI application layer structure (ISO/IEC 9545), and is a technical revision superseding the 2010 edition.

Key topics and requirements

• Application layer services (FAL): Defines the services available to FAL users and the role of Systems Management at the application layer boundary.
• Communication model and ASEs: Covers Application Service Elements (ASEs), application relationships (ARs), and interaction models (e.g., producer–consumer).
• Data types and object dictionary: Formal definitions for application-layer data types and an object dictionary structure used by Type 22 devices.
• Configuration and management services: Describes services for AL-Network verification, AL-RTFL/RTFN configuration, delay measurement, PCS configuration, and application layer management.
• Process and service exchanges: Includes Process Data Object (PDO) mapping principles, Service Data Object (SDO) sequences (expedited/normal upload/download and abort), emergency and heartbeat services, and frame/send services.
• Device reference models: Defines RTFL/RTFN device reference models and Type 22 device structures to support interoperability and conformance testing.
• Conformance and normative references: Specifies conformance expectations and references related IEC/ISO standards (e.g., IEC 61158 parts, ISO/IEC 8822/9545).

Applications and who uses it

EN 61158-5-22:2014 is intended for:

• Industrial control system designers and system integrators implementing Type 22 fieldbus solutions.
• Device manufacturers building fieldbus-enabled I/O, PLCs, motion controllers, and gateways requiring standardized application-layer services.
• Network architects and commissioning engineers who configure application-layer parameters, PDO/SDO mappings, and perform system diagnostics.
• Standards and compliance teams assessing conformance with IEC/EN fieldbus specifications.

Common practical uses include device interoperability, fieldbus application design, configuration of process data mapping, and systems management in process and factory automation.

Related standards

• IEC 61158 series (Part 1 overview, Parts 4-22 data-link, 6-22 application protocol)
• ISO/IEC 7498-1 (OSI Basic Reference Model)
• ISO/IEC 9545 (OSI application layer structure)
• IEC 61131-3 (programmable controller programming languages)

Keywords: EN 61158-5-22:2014, IEC 61158-5-22, industrial communication networks, fieldbus, application layer, FAL, Type 22, OSI model, SDO, PDO, object dictionary.

Standards Content (Sample)

SLOVENSKI STANDARD
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
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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
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.

- 3 - EN 61158-5-22:2014
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 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.
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

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

– 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

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

– 4 – IEC 61158-5-22:2014 © IEC 2014
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-
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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
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services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
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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.

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.
– 6 – IEC 61158-5-22:2014 © IEC 2014
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.

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

– 8 – IEC 61158-5-22:2014 © IEC 2014
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 references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any
amendments) applies.
NOTE All parts of the IEC 61158 series, as well as IEC 61784-1 and IEC 61784-2 are maintained simultaneously.
Cross-references to these documents within the text therefore refer to the editions as dated in this list of normative
references.
IEC 61131-3, Programmable controllers – Part 3: Programming languages
IEC 61158-1:2014, Industrial communication networks – Fieldbus specifications – Part 1:
Overview and guidance for the IEC 61158 and IEC 61784 series
IEC 61158-4-22:2014, Industrial communication networks – Fieldbus specifications –
Part 4-22: Data-link layer protocol specification – Type 22 elements
IEC 61158-6-22, Industrial communication networks – 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
IEC 61158-5-22:2014 © IEC 2014 – 9 –
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
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 60559, Information technology – Microprocessor systems – Floating-point
arithmetic
3 Terms, definitions, abbreviations, symbols and conventions
For the purposes of this document, the following terms, definitions, symbols and abbreviations
as defined in these publications apply:
3.1 ISO/IEC 7498-1 terms
a) application entity
b) application process
c) application protocol data unit
d) application service element
e) application entity invocation
f) application process invocation
g) application transaction
h) real open system
i) transfer syntax
3.2 ISO/IEC 8822 terms
a) abstract syntax
b) presentation context
3.3 ISO/IEC 9545 terms
a) application-association
b) application-context
c) application context name
d) application-entity-invocation
e) application-entity-type
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f) application-process-invocation
g) application-process-type
h) application-service-element
i) application control service element
3.4 ISO/IEC 8824-1 terms
a) object identifier
b) type
3.5 Type 22 fieldbus application-layer specific definitions
3.5.1
application
function for which data is exchanged
3.5.2
application object
representation of a particular component within a device
3.5.3
acyclic data
data which is transferred from time to time for dedicated purposes
3.5.4
bit
unit of information consisting of a 1 or a 0
Note 1 to entry:  This is the smallest data unit that can be transmitted.
3.5.5
cell
synonym for a single DL-segment which uses RTFL communication model
3.5.6
channel
path provided for conveying data
3.5.7
client
object which uses the services of a server by initiating a message to perform a task
3.5.8
communication cycle
fixed time period between which the root device issues empty DLPDUs for cyclic
communication initiation in which data is transmitted utilizing CDC and MSC
3.5.9
connection
logical binding between two application objects
3.5.10
cycle time
duration of a communication cycle
3.5.11
cyclic
events which repeat in a regular and repetitive manner

IEC 61158-5-22:2014 © IEC 2014 – 11 –
3.5.12
cyclic communication
periodic exchange of telegrams
3.5.13
cyclic data
data which is transferred in a regular and repetitive manner for dedicated purposes
3.5.14
cyclic data channel
CDC
part of one or more DLPDUs, which is reserved for cyclic data
3.5.15
data
generic term used to refer to any information carried over a fieldbus
3.5.16
device
physical entity connected to the fieldbus
3.5.17
error
discrepancy between a computed, observed or measured value or condition and the specified
or theoretically correct value or condition
3.5.18
error code
identification number of a specific type of error
3.5.19
gateway
device acting as a linking element between different protocols
3.5.20
index
position of an object within the object dictionary
3.5.21
inter-cell communication
communication between a RTFL device and a RTFN device or communication between a
RTFL device and another RTFL device in different cells linked by RTFN
3.5.22
interface
shared boundary between two functional units, defined by functional characteristics, signal
characteristic, or other characteristics as appropriate
3.5.23
intra-cell communication
communication between a RTFL device and another RTFL device in the same cell
3.5.24
logical double line
sequence of root device and all ordinary devices processing the communication DLPDU in
forward and backward direction

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3.5.25
mapping parameters
set of values defining the correspondence between application objects and process data
objects
3.5.26
master clock
global time base for the PCS mechanism
3.5.27
message
ordered sequence of octets intended to convey data
3.5.28
message channel
MSC
part of one or more DLPDUs, which is reserved for acyclic data
3.5.29
network
set of devices connected by some type of communication medium, including any intervening
repeaters, bridges, routers and lower-layer gateways
3.5.30
ordinary device
OD
slave in the communication system, which utilizes RTFL for cyclic and acyclic data
interchange with other ODs in the same logical double line
3.5.31
precise clock synchronization
PCS
mechanism to synchronize clocks of RTFL devices and maintain a global time base
3.5.32
process data
data designated to be transferred cyclically or acyclically for the purpose of processing
3.5.33
process data object
dedicated data object(s) designated to be transferred cyclically or acyclically for the purpose
of processing
3.5.34
protocol
convention about the data formats, time sequences, and error correction in the data exchange
of communication systems
3.5.35
root device
RD
master in the communication system, which organises, initiates and controls the RTFL cyclic
and acyclic data interchange for one logical double line
3.5.36
real time frame line
RTFL
communication model communicating in a logical double line

IEC 61158-5-22:2014 © IEC 2014 – 13 –
3.5.37
real time frame network
RTFN
communication model communicating in a switched network
3.5.38
round trip time
transmission time needed by a DLPDU from the RD to the last OD in forward and backward
direction
3.5.39
sub-index
sub-position of an individual element of an object within the object dictionary
3.5.40
timing signal
time-based indication of the occurrence of an event, commonly as an interrupt signal, used for
DL-user synchronization
3.5.41
topology
physical network architecture with respect to the connection between the stations of the
communication system
3.6 Abbreviations and symbols
AE Application entity
AL Application layer
ALME Application layer management entity
AP Application process
APDU Application layer protocol data unit
APO Application process object
AR Application relationship
AREP Application relationship end point
ASE Application service element
CAN Controller area network
CDC Cyclic data channel
CDCL CDC line
CDCN CDC network
CeS CANopen expands Type 22
CL Communication layer
Cnf Confirmation
DA Device address
DHCP Dynamic Host Configuration Protocol
DL- Data-link layer (as a prefix)
DLL DL-layer
DLPDU DL-protocol data unit
EDS Electronic data sheet
– 14 – IEC 61158-5-22:2014 © IEC 2014
EMCY Emergency
FAL Fieldbus application layer
GW Gateway
ID Identification
IETF Internet Engineering Task Force
Ind Indication
IP Internet protocol
IPv4 IP version 4
IPv6 IP version 6
IRQ Interrupt request
LME Layer management entity
MAC Medium access control
MC Master clock
MII Media independent interface
MSC Message channel
MSCL MSC line
MSCN MSC network
OD Ordinary device
OS Operating system
OSI Open systems interconnection
PCS Precise clock synchronization
PDO Process data object
PHY Physical interface controller
PID Packet ID
PTMNSU Point-to-multipoint network-scheduled unconfirmed
PTPNSC Point-to-point network-scheduled confirmed
PTPNSU Point-to-point network-scheduled unconfirmed
PTPUTC Point-to-point user-triggered confirmed
RD Root device
Req Request
RFC Request for comments
Rsp Response
RTF Real time frame
RTFL Real time frame line
RTFN Real time frame network
RO Read only
RW Read and write access
Rx Receive direction
RxPDO Receive PDO
SDO Service data object
IEC 61158-5-22:2014 © IEC 2014 – 15 –
SEF Standard ISO/IEC 8802-3 DLPDU
StdErr Standard error output
StdIn Standard input
StdOut Standard output
SYNC Synchronization
TCP Transmission control protocol
TT Transmission type
Tx Transmit direction
TxPDO Transmit PDO
UDP User datagram protocol
WO Write only
3.7 Conventions
3.7.1 Overview
The FAL is defined as a set of object-oriented ASEs. Each ASE is specified in a separate sub-
clause. Each ASE specification is composed of two parts, its class specification, and its
service specification.
The class specification defines the attributes of the class. The attributes are accessible from
instances of the class using the Object Management ASE services specified in Clause 5 of
this standard. The service specification defines the services that are provided by the ASE.
3.7.2 General conventions
This standard uses the descriptive conventions given in ISO/IEC 10731.
3.7.3 Conventions for class definitions
Class definitions are described using templates. Each template consists of a list of attributes
for the class. The general form of the template is shown below:
FAL ASE: ASE Name
CLASS: Class name
CLASS ID: #
PARENT CLASS: Parent class name
ATTRIBUTES:
1 (o) Key Attribute: numeric identifier
2 (o) Key Attribute: name
3 (m) Attribute: attribute name(values)
4 (m) Attribute: attribute name(values)
4.1 (s) Attribute: attribute name(values)
4.2 (s) Attribute: attribute name(values)
4.3 (s) Attribute: attribute name(values)
5. (c) Constraint: constraint expression
5.1 (m) Attribute: attribute name(values)
5.2 (o) Attribute: attribute name(values)
6 (m) Attribute: attribute name(values)
6.1 (s) Attribute: attribute name(values)

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6.2 (s) Attribute: attribute name(values)
SERVICES:
1 (o) OpsService: service name
2 (c) Constraint: constraint expression
2.1 (o) OpsService: service name
3 (m) MgtService: service name

(1) The "FAL ASE:" entry is the name of the FAL ASE that provides the services for the
class being specified.
(2) The "CLASS:" entry is the name of the class being specified. All objects defined using
this template will be an instance of this class. The class may be specified by this
standard, or by a user of this standard.
(3) The "CLASS ID:" entry is a number that identifies the class being specified. This
number is unique within the FAL ASE that will provide the services for this class. When
qualified by the identity of its FAL ASE, it unambiguously identifies the class within the
scope of the FAL. The value "NULL" indicates that the class cannot be instantiated.
Class IDs between 1 and 255 are reserved by this standard to identify standardized
classes. They have been assigned to maintain compatibility with existing national
standards. CLASS IDs between 256 and 2048 are allocated for identifying user defined
classes.
(4) The "PARENT CLASS:" entry is the name of the parent class for the class being
specified. All attributes defined for the parent class and inherited by it are inherited for
the class being defined, and therefore do not have to be redefined in the template for
this class.
NOTE The parent-class "TOP" indicates that the class being defined is an initial class definition. The parent
class TOP is used as a starting point from which all other classes are defined. The use of TOP is reserved for
classes defined by this standard.
(5) The "ATTRIBUTES" label indicate that the following entries are attributes defined for
the class.
a) Each of the attribute entries contains a line number in column 1, a mandatory (m) /
optional (o) / conditional (c) / selector (s) indicator in column 2, an attribute type
label in column 3, a name or a conditional expression in column 4, and optionally a
list of enumerated values in column 5. In the column following the list of values, the
default value for the attribute may be specified.
b) Objects are normally identified by a numeric identifier or by an object name, or by
both. In the class templates, these key attributes are defined under the key
attribute.
c) The line number defines the sequence and the level of nesting of the line. Each
nesting level is identified by period. Nesting is used to specify
i) fields of a structured attribute (4.1, 4.2, 4.3),
ii) attributes conditional on a constraint statement (5). Attributes may be
mandatory (5.1) or optional (5.2) if the constraint is true. Not all optional
attributes require constraint statements as does the attribute defined in (5.2).
iii) the selection fields of a choice type attribute (6.1 and 6.2).
(6) The "SERVICES" label indicates that the following entries are services defined for the
class.
a) An (m) in column 2 indicates that the service is mandatory for the class, while an

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