SIST EN 61158-5-20:2015
(Main)Industrial communication networks - Fieldbus specifications - Part 5-20: Application layer service definition - Type 20 elements (IEC 61158-5-20:2014)
Industrial communication networks - Fieldbus specifications - Part 5-20: Application layer service definition - Type 20 elements (IEC 61158-5-20:2014)
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 International Standard provides common elements for basic time-critical and non-timecritical
messaging communications between application programs in an automation
environment and material specific to Type 20 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 20 fieldbus Application Layer in terms of
a) an abstract model for defining application resources (objects) capable of being
manipulated by users via the use of the FAL service,
b) the primitive actions and events of the service;
c) the parameters associated with each primitive action and event, and the form which they
take; and
d) the interrelationship between these actions and events, and their valid sequences.
The purpose of this International Standard is to define the services provided to the FAL
user at the boundary between the user and the Application Layer of the Fieldbus Reference
Model.
This International Standard specifies the structure and services of the IEC fieldbus Application
Layer, in conformance with the OSI Basic Reference Model (ISO/IEC 7498-1) and the OSI
Application Layer Structure (ISO/IEC 9545).
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 International Standard to provide access to the FAL to control certain aspects of its
operation.
Industrielle Kommunikationsnetze - Feldbusse - Teil 5-20: Dienstfestlegungen des Application Layer (Anwendungsschicht) - Typ 20-Elemente (IEC 61158-5-20:2014)
Réseaux de communication industriels - Spécifications des bus de terrain - Partie 5-20: Définition des services de la couche application - Eléments de type 20 (CEI 61158-5-20:2014)
L'IEC 61158-5-20:2014 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 troisième édition annule et remplace la deuxième édition parue en 2010. Elle constitue une révision technique. Cette édition inclut les modifications majeures suivantes:
- ajout de Types de données;
- ajout de services;
- mise à jour des Références Normatives, des Termes, définitions, symboles, abréviations,
- correction des erreurs rédactionnelles et syntaxiques.
Industrijska komunikacijska omrežja - Specifikacije za procesna vodila - 5-20. del: Definicija opravil na aplikacijski ravni - Elementi tipa 20 (IEC 61158-5-20:2014)
Aplikacijski nivo procesnih vodil (FAL) omogoča uporabniškim programom dostop do komunikacijskega okolja procesnih vodil. Glede na to je mogoče aplikacijski nivo procesnih vodil šteti za »okno med ustreznimi aplikacijami«.
Ta mednarodni standard določa skupne elemente za osnovne časovno kritične in časovno nekritične
sporočilne komunikacije med aplikacijskimi programi v avtomatizacijskem okolju in materialom, specifičnim za procesna vodila tipa 20. 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 20 v smislu a) abstraktnega modela za določanje aplikacijskih virov (objektov), ki jih uporabniki lahko spreminjajo prek opravila aplikacijskega nivoja procesnih vodil, 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 opredeliti opravila, ki se zagotavljajo za uporabnika aplikacijskega nivoja procesnih vodil na meji med uporabnikom in aplikacijskim nivojem referenčnega modela procesnih vodil. Ta mednarodni standard določa strukturo in opravila aplikacijskega nivoja procesnih vodil IEC v skladu z osnovnim referenčnim modelom OSI (ISO/IEC 7498-1) in strukturo aplikacijskega nivoja OSI (ISO/IEC 9545).
Čeprav ta opravila določajo način izdajanja in dostavljanja zahtev in odzivov z vidika aplikacij, ne zajemajo specifikacije v zvezi s tem, kako naj se nanje odzovejo aplikacije, ki te zahteve in odzive oddajajo. To pomeni, da vedenjski vidiki aplikacij niso opredeljeni; opredeljena je le definicija zahtev in odzivov, ki jih lahko pošiljajo/prejemajo. Tako se uporabnikom aplikacijskega nivoja procesnih vodil omogoči večja prilagodljivost pri standardizaciji takega vedenja objektov. Poleg teh opravil so v tem mednarodnem standardu 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 61158-5-20:2015
01-marec-2015
1DGRPHãþD
SIST EN 61158-5-20:2012
Industrijska komunikacijska omrežja - Specifikacije za procesna vodila - 5-20. del:
Definicija opravil na aplikacijski ravni - Elementi tipa 20 (IEC 61158-5-20:2014)
Industrial communication networks - Fieldbus specifications - Part 5-20: Application layer
service definition - Type 20 elements (IEC 61158-5-20:2014)
Industrielle Kommunikationsnetze - Feldbusse - Teil 5-20: Dienstfestlegungen des
Application Layer (Anwendungsschicht) - Typ 20-Elemente (IEC 61158-5-20:2014)
Réseaux de communication industriels - Spécifications des bus de terrain - Partie 5-20:
Définition des services de la couche application - Eléments de type 20 (CEI 61158-5-
20:2014)
Ta slovenski standard je istoveten z: EN 61158-5-20:2014
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 61158-5-20:2015 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 61158-5-20:2015
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SIST EN 61158-5-20:2015
EUROPEAN STANDARD EN 61158-5-20
NORME EUROPÉENNE
EUROPÄISCHE NORM
October 2014
ICS 25.040.40; 35.100.70; 35.110 Supersedes EN 61158-5-20:2012
English Version
Industrial communication networks - Fieldbus specifications -
Part 5-20: Application layer service definition - Type 20 elements
(IEC 61158-5-20:2014)
Réseaux de communication industriels - Spécifications des Industrielle Kommunikationsnetze - Feldbusse -
bus de terrain - Partie 5-20: Définition des services de la Teil 5-20: Dienstfestlegungen des Application Layer
couche application - Eléments de type 20 (Anwendungsschicht) - Typ 20-Elemente
(CEI 61158-5-20:2014) (IEC 61158-5-20:2014)
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 61158-5-20:2014 E
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SIST EN 61158-5-20:2015
EN 61158-5-20:2014 - 2 -
Foreword
The text of document 65C/763/FDIS, future edition 3 of IEC 61158-5-20, 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 61158-5-20:2014.
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 61158-5-20:2012.
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 61158-5-20:2014 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 61158-6-20 NOTE Harmonized as EN 61158-6-20.
IEC 61784-1 NOTE Harmonized as EN 61784-1.
IEC 61784-2 NOTE Harmonized as EN 61784-2.
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SIST EN 61158-5-20:2015
- 3 - EN 61158-5-20:2014
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
NOTE 1 When an International Publication has been modified by common modifications, indicated by (mod), the relevant
EN/HD applies.
NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available here:
www.cenelec.eu
Publication Year Title EN/HD Year
IEC 61158-1 2014 Industrial communication networks - EN 61158-1 2014
Fieldbus specifications -
Part 1: Overview and guidance for the
IEC 61158 and IEC 61784 series
IEC 62591 2010 Industrial communication networks - EN 62591 2010
Wireless communication network
and communication profiles -
TM
WirelessHART
ISO/IEC 7498-1 - Information technology - Open Systems - -
Interconnection - Basic reference model:
The basic model
ISO/IEC 8824-1 - Information technology - Abstract Syntax - -
Notation One (ASN.1): Specification of
basic notation
ISO/IEC 8859-1 - Information technology - 8-bit single-byte - -
coded graphic character sets -
Part-1: Latin alphabet No. 1
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
IEEE 754 - IEEE Standard for Floating-Point - -
Arithmetic
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SIST EN 61158-5-20:2015
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SIST EN 61158-5-20:2015
IEC 61158-5-20
®
Edition 3.0 2014-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Industrial communication networks – Fieldbus specifications –
Part 5-20: Application layer service definition – Type 20 elements
Réseaux de communication industriels – Spécifications des bus de terrain –
Partie 5-20: Définition des services de la couche application – Eléments
de type 20
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX XA
ICS 25.040.40; 35.100.70; 35.110 ISBN 978-2-8322-1741-2
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 61158-5-20:2015
– 2 – IEC 61158-5-20:2014 © IEC 2014
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 6
2 Normative references . 6
3 Terms, definitions, symbols, abbreviations and conventions . 7
3.1 Terms and definitions from other ISO/IEC standards . 7
3.2 IEC 61158-1 terms . 8
3.3 Type 20 fieldbus application-layer specific definitions . 10
3.4 Abbreviations and symbols . 12
3.5 Conventions . 13
4 Concepts . 16
5 Data type ASE . 16
5.1 Overview . 16
5.2 Formal definition of data type objects . 18
5.3 FAL defined data types . 20
5.4 Data type ASE service specification . 23
5.5 Summary of data types . 24
6 Communication model specification . 24
6.1 Common parameters . 24
6.2 ASEs . 25
6.3 ARs . 52
6.4 Summary of classes . 54
6.5 Permitted services by AREP role . 55
Bibliography . 56
Figure 1 – Data type class hierarchy . 17
Figure 2 – VFD model . 25
Table 1 – Packed ASCII character set . 23
Table 2 – ISO Latin-1 characters . 23
Table 3 – Data type summary . 24
Table 4 – Response code values . 24
Table 5 – Communication status values . 25
Table 6 – Identify service parameters . 28
Table 7 – Read service parameters . 32
Table 8 – Write service parameters . 33
Table 9 – Information report parameters . 34
Table 10 – Action service parameters . 36
Table 11 – AR get attributes service parameters . 53
Table 12 – AR set attributes service parameters . 54
Table 13 – Class summary . 55
Table 14 – Confirmed services by AREP class . 55
Table 15 – Unconfirmed services by AREP class . 55
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IEC 61158-5-20:2014 © IEC 2014 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
INDUSTRIAL COMMUNICATION NETWORKS –
FIELDBUS SPECIFICATIONS –
Part 5-20: Application layer service definition –
Type 20 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 61158-5-20 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 2010. This edition
constitutes a technical revision.
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The main change with respect to the previous edition is listed below:
– added Data types;
– added services;
– updated the Normative references, Terms, definitions, symbols, abbreviations;
– corrected the editorial errors and the text.
The text of this standard is based on the following documents:
FDIS Report on voting
65C/763/FDIS 65C/773/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with 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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IEC 61158-5-20:2014 © IEC 2014 – 5 –
INTRODUCTION
This document is one of a series produced to facilitate the interconnection of automation
system components. It is related to other documents 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 5-20: Application layer service definition –
1 Scope
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 International Standard provides common elements for basic time-critical and non-time-
critical messaging communications between application programs in an automation
environment and material specific to Type 20 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 20 fieldbus Application Layer in terms of
a) an abstract model for defining application resources (objects) capable of being
manipulated by users via the use of the FAL service,
b) the primitive actions and events of the service;
c) the parameters associated with each primitive action and event, and the form which they
take; and
d) the interrelationship between these actions and events, and their valid sequences.
The purpose of this International Standard is to define the services provided to the FAL
user at the boundary between the user and the Application Layer of the Fieldbus Reference
Model.
This International Standard specifies the structure and services of the IEC fieldbus Application
Layer, in conformance with the OSI Basic Reference Model (ISO/IEC 7498-1) and the OSI
Application Layer Structure (ISO/IEC 9545).
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 International Standard to provide access to the FAL to control certain aspects of its
operation.
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.
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IEC 61158-5-20:2014 © IEC 2014 – 7 –
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 61158-1:2014, Industrial communication networks – Fieldbus specifications – Part 1:
Overview and guidance for the IEC 61158 and IEC 61784 series
IEC 62591:2010, Industrial communication networks – Wireless communication network and
communication profiles – WirelessHART™
ISO/IEC 7498-1, Information technology – Open Systems Interconnection – Basic Reference
Model: The Basic Model
ISO/IEC 8824-1, Information technology – Abstract Syntax Notation One (ASN.1):
Specification of basic notation
ISO/IEC 8859-1, Information technology – 8-bit single-byte coded graphic character sets –
Part 1: Latin alphabet No. 1
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
ANSI/IEEE 754: IEEE Standard for Floating-Point Arithmetic
3 Terms, definitions, symbols, abbreviations and conventions
For the purposes of this document, the following terms, definitions, abbreviations, symbols
and conventions apply.
3.1 Terms and definitions from other ISO/IEC standards
3.1.1 ISO/IEC 7498-1 terms
a) abstract syntax
b) application entity
c) application process
d) application protocol data unit
e) application service element
3.1.2 ISO/IEC 9545 terms
a) application-entity-invocation
b) application-service-element
c) application-service-element
3.1.3 ISO/IEC 8824-1 terms
a) object identifier
b) type
c) value
d) simple type
e) structured type
f) component type
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g) tag
h) true
i) false
j) integer type
k) octet string type
m) null type
3.2 IEC 61158-1 terms
For the purposes of this document, the following terms and definitions apply.
3.2.1
application
function or data structure for which data is consumed or produced
3.2.2
application object
object class that manages and provides the run time exchange of messages across the
network and within the network device
Note 1 to entry: Multiple types of application object classes may be defined.
3.2.3
application process
part of a distributed application on a network, which is located on one device and
unambiguously addressed
3.2.4
application process object
component of an application process that is identifiable and accessible through an FAL
application relationship
Note 1 to entry: Application process object definitions are composed of a set of values for the attributes of their
class (see the definition for Application Process Object Class Definition). Application process object definitions may
be accessed remotely using the services of the FAL Object Management ASE. FAL Object Management services
can be used to load or update object definitions, to read object definitions, and to dynamically create and delete
application objects and their corresponding definitions
3.2.5
application process object class
class of application process objects defined in terms of the set of their network-accessible
attributes and services
3.2.6
application relationship
cooperative association between two or more application-entity-invocations for the purpose of
exchange of information and coordination of their joint operation
Note 1 to entry: This relationship is activated either by the exchange of application-protocol-data-units or as a
result of pre-configuration activities
3.2.7
application relationship endpoint
context and behavior of an application relationship as seen and maintained by one of the
application processes involved in the application relationship
Note 1 to entry: Each application process involved in the application relationship maintains its own application
relationship endpoint
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3.2.8
attribute
description of an externally visible characteristic or feature of an object
Note 1 to entry: The attributes of an object contain information about variable portions of an object. Typically, they
provide status information or govern the operation of an object. Attributes may also affect the behaviour of an
object. Attributes are divided into class attributes and instance attributes
3.2.9
behaviour
indication of how the object responds to particular events
Note 1 to entry: Its description includes the relationship between attribute values and services.
3.2.10
class
set of objects, all of which represent the same kind of system component
Note 1 to entry: A class is a generalisation of the object; a template for defining variables and methods. All
objects in a class are identical in form and behaviour, but usually contain different data in their attributes
3.2.11
class attributes
attribute that is shared by all objects within the same class
3.2.12
class code
unique identifier assigned to each object class
3.2.13
class specific service
service defined by a particular object class to perform a required function which is not
performed by a common service
Note 1 to entry: A class specific object is unique to the object class which defines it.
3.2.14
client
a) an object which uses the services of another (server) object to perform a task
b) an initiator of a message to which a server reacts, such as the role of an AR endpoint in
which it issues confirmed service request APDUs to a single AR endpoint acting as a
server
3.2.15
conveyance path
unidirectional flow of APDUs across an application relationship
3.2.16
cyclic
term used to describe events which repeat in a regular and repetitive manner
3.2.17
endpoint
one of the communicating entities involved in a connection
3.2.18
error
discrepancy between a computed, observed or measured value or condition and the specified
or theoretically correct value or condition
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SIST EN 61158-5-20:2015
– 10 – IEC 61158-5-20:2014 © IEC 2014
3.2.19
error code
identification of a specific type of error within an error class
3.2.20
management information
network-accessible information that supports managing the operation of the fieldbus system,
including the application layer
Note 1 to entry: Managing includes functions such as controlling, monitoring, and diagnosing.
3.2.21
server
a) role of an AREP in which it returns a confirmed service response APDU to the client that
initiated the request
b) an object which provides services to another (client) object
3.2.2
...
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