IEC 61158-5-20:2007

Industrial communication networks - Fieldbus specifications - Part 5-20: Application layer service definition - Type 20 elements

IEC 61158-5-20:2007 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 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. It includes the following significant changes with respect to the previous edition deletion of the former Type 6 fieldbus, and the placeholder for a Type 5 fieldbus data-link layer, for lack of market relevance; addition of new types of fieldbuses; division of this part into multiple parts numbered.

Réseaux de communications industriels - Spécifications des bus de terrain - Partie 5-20: Définition des services de la couche application - Eléments de Type 20

L'IEC 61158-5-20:2007 définit les services fournis: à l'utilisateur FAL à la limite entre l'utilisateur et la couche application du modèle de référence de bus de terrain, et à la gestion des systèmes à la limite entre la couche application et la gestion des systèmes du modèle de référence de bus de terrain. Elle spécifie la structure et les services de la couche application de bus de terrain CEI, conformément au modèle de référence de base OSI (ISO/CEI 7498) et à la structure de la couche application OSI (ISO/CEI 9545). Cette première édition et les autres normes de la sous-partie CEI 61158-5 annulent et remplacent la CEI 61558-5:2003. Cette édition de la présente partie constitue un ajout technique. Elle inclut les modifications suivantes: suppression de l'ancien bus de terrain de Type 6, qui n'est plus adapté au marché; ajout de nouveaux types de bus de terrain; éclatement de la partie 5 de la troisième édition en plusieurs parties numérotées-5-2, -5-3, La présente version bilingue (2014-06) correspond à la version anglaise monolingue publiée en 2007-12.

General Information

• Status: Published
• Publication Date: 13-Dec-2007
• ICS: 25.040.40 - Industrial process measurement and control
• ICS: 35.100.70 - Application layer
• Technical Committee: SC 65C - Industrial networks
• Drafting Committee: WG 9 - TC 65/SC 65C/WG 9
• Current Stage: DELPUB - Deleted Publication
• Completion Date: 06-Aug-2010

Relations

• Replaces: IEC 61158-5:2003/COR1:2004 - Corrigendum 1 - Digital data communications for measurement and control - Fieldbus for use in industrial control systems - Part 5: Application layer service definition
• Effective Date: 05-Sep-2023
• Replaces: IEC 61158-5:2003 - Digital data communications for measurement and control - Fieldbus for use in industrial control systems - Part 5: Application layer service definition
• Effective Date: 05-Sep-2023
• Revised: IEC 61158-5-20:2010 - Industrial communication networks - Fieldbus specifications - Part 5-20: Application layer service definition - Type 20 elements
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 61158-5-20
Edition 1.0 2007-12
INTERNATIONAL
STANDARD
Industrial communication networks – Fieldbus specifications –
Part 5-20: Application layer service definition – Type 20 elements

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form

or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
either IEC or IEC's member National Committee in the country of the requester.
If you have any questions about IEC copyright or have an enquiry about obtaining additional rights to this publication,

please contact the address below or your local IEC member National Committee for further information.

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IEC 61158-5-20
Edition 1.0 2007-12
INTERNATIONAL
STANDARD
Industrial communication networks – Fieldbus specifications –
Part 5-20: Application layer service definition – Type 20 elements

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
X
ICS 35.100.70; 25.040.40 ISBN 2-8318-9473-5

– 2 – 61158-5-20 © IEC:2007(E)

CONTENTS
FOREWORD.4

INTRODUCTION.6

1 Scope.7

1.1 Overview .7

1.2 Specifications .8

1.3 Conformance.8

2 Normative references .8

3 Terms, definitions, symbols, abbreviations 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 terms .9
3.5 IEC/TR 61158-1 terms.9
3.6 Fieldbus application-layer specific definitions .12
3.7 Abbreviations and symbols .14
3.8 Conventions .14
4 Concepts .18
5 Data type ASE.18
5.1 Overview .18
5.2 Formal definition of data type objects .19
5.3 FAL defined data types.21
5.4 Data type ASE service specification .24
5.5 Summary of data types.24
6 Communication model specification .25
6.1 Common parameters .25
6.2 ASEs .26
6.3 ARs .41
6.4 Summary of classes .44
6.5 Permitted services by AREP role .44
Bibliography.46

Figure 1 – Data type class hierarchy .18

Figure 2 – VFD model .26

Table 1 – Packed ASCII character set.
Table 2 – ISO Latin-1 characters .24
Table 3 – Data type summary .24
Table 4 – Comm status values .25
Table 5 – Response code values .25
Table 6 – Device status values .26
Table 7 – Identify service parameters .29
Table 8 – Read service parameters.32
Table 9 – Write service parameters.33
Table 10 – AR get attributes service parameters.43
Table 11 – AR set attributes service parameters .44

61158-5-20 © IEC:2007(E) – 3 –

Table 12 – Class summary.44

Table 13 – Services by AREP class .45

– 4 – 61158-5-20 © IEC:2007(E)

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,
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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
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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.
NOTE  Use of some of the associated protocol types is restricted by their 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 particular data-link layer protocol type to be used with physical layer and application layer protocols in Type
combinations as specified explicitly in the IEC 61784 series. Use of the various protocol types in other
combinations may require permission from their respective intellectual-property-right holders.
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 edition and its companion parts of IEC 61158-5 cancel and replace IEC 61158-5:2003.
This edition of this part constitutes a technical addition.
This edition of IEC 61158-5 includes the following significant changes from the prior edition:
a) deletion of the former Type 6 fieldbus for lack of market relevance;
b) addition of new types of fieldbuses;

61158-5-20 © IEC:2007(E) – 5 –

c) partition of part 5 of the third edition into multiple parts numbered -5-2, -5-3, …

The text of this standard is based on the following documents:

FDIS Report on voting
65C/475/FDIS 65C/486/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.

The committee has decided that the contents of this publication will remain unchanged until
the maintenance result 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.
NOTE  The revision of this standard will be synchronized with the other parts of the IEC 61158 series.
The list of all the parts of the IEC 61158 series, under the general title Industrial
communication networks – Fieldbus specifications, can be found on the IEC web site.

– 6 – 61158-5-20 © IEC:2007(E)

INTRODUCTION
This standard 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/TR 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 characterist
...

IEC 61158-5-20 ®
Edition 1.0 2007-12
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
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form

or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from

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The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.

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The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
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IEC 61158-5-20 ®
Edition 1.0 2007-12
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 X
ICS 25.040.40; 35.100.70 ISBN 978-2-8322-1508-1

– 2 – IEC 61158-5-20:2007 © IEC:2007

CONTENTS
FOREWORD . 4

INTRODUCTION . 6

1 Scope . 7

1.1 Overview . 7

1.2 Specifications . 8

1.3 Conformance . 8

2 Normative references . 8

3 Terms, definitions, symbols, abbreviations 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 terms . 9
3.5 IEC/TR 61158-1 terms . 9
3.6 Fieldbus application-layer specific definitions . 12
3.7 Abbreviations and symbols . 14
3.8 Conventions . 14
4 Concepts . 18
5 Data type ASE . 18
5.1 Overview . 18
5.2 Formal definition of data type objects . 19
5.3 FAL defined data types . 21
5.4 Data type ASE service specification . 24
5.5 Summary of data types . 24
6 Communication model specification . 25
6.1 Common parameters . 25
6.2 ASEs . 26
6.3 ARs . 41
6.4 Summary of classes . 44
6.5 Permitted services by AREP role . 44
Bibliography . 46

Figure 1 – Data type class hierarchy . 18

Figure 2 – VFD model . 26

Table 1 – Packed ASCII character set . 23
Table 2 – ISO Latin-1 characters . 24
Table 3 – Data type summary . 24
Table 4 – Comm status values . 25
Table 5 – Response code values . 25
Table 6 – Device status values . 26
Table 7 – Identify service parameters . 29
Table 8 – Read service parameters . 32
Table 9 – Write service parameters . 33
Table 10 – AR get attributes service parameters . 43
Table 11 – AR set attributes service parameters . 44

Table 12 – Class summary . 44

Table 13 – Services by AREP class . 45

– 4 – IEC 61158-5-20:2007 © IEC:2007

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
...