Industrial communication networks - Fieldbus specifications - Part 6-9: Application layer protocol specification - Type 9 elements (IEC 61158-6-9:2014)

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 9 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 behavior provided by the Type
9 fieldbus Application Layer in terms of
a) the abstract syntax defining the application layer protocol data units conveyed between
communicating application entities,
b) the transfer syntax defining the application layer protocol data units conveyed between
communicating application entities,
c) the application context state machine defining the application service behavior visible
between communicating application entities; and
d) the application relationship state machines defining the communication behavior visible
between communicating application entities; and.
The purpose of this standard is to define the protocol provided to
1) define the wire-representation of the service primitives defined in IEC 61158-5-9, and
2) define the externally visible behavior associated with their transfer.
This standard specifies the protocol of the Type 9 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).

Industrielle Kommunikationsnetze - Feldbusse - Teil 6-9: Protokollspezifikation des Application Layer (Anwendungsschicht) - Typ 9-Elemente (IEC 61158-6-9:2014)

Réseaux de communication industriels - Spécifications des bus de terrain - Partie 6-9: Spécification du protocole de la couche application - Éléments de type 9 (CEI 61158-6-9:2014)

L'IEC 61158-6-9:2014 décrit le protocole mis en place pour définir la représentation filaire des primitives de service définies dans la CEI 61158-5-9 et définir le comportement visible de l'extérieur associé à leur transfert. La présente norme spécifie le protocole de la couche application de bus de terrain de Type 9, en conformité avec le modèle de référence de base OSI (ISO/CEI 7498-1) et la structure de la couche application OSI (ISO/CEI 9545). Cette troisième édition annule et remplace la deuxième édition parue en 2010. Elle constitue une révision technique. Les principales modifications sont:
- Correction de la plage valide de Time-difference (écart du temps);
- Correction des Passages d'états du Tableau 3;
- Inclusion de la classe de ponctualité "Transparent" dans le modèle formel des points AREP BNU.

Industrijska komunikacijska omrežja - Specifikacije za procesna vodila - 6-9. del: Specifikacija protokola na aplikacijski ravni - Elementi tipa 9 (IEC 61158-6-9:2014)

Aplikacijski nivo procesnih vodil (FAL) omogoča uporabniškim programom dostop do komunikacijskega okolja procesnih vodil. Glede na to 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 material, specifičen za procesna vodila tipa 9. 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 vedenje, ki ga zagotavlja aplikacijski nivo procesnih vodil tipa 9 v smislu
a) abstraktne sintakse, ki določa podatkovne enote protokola aplikacijskega nivoja, ki se prenašajo med aplikacijskimi osebki, ki komunicirajo,
a) prenosne sintakse, ki določa podatkovne enote protokola aplikacijskega nivoja, ki se prenašajo med aplikacijskimi osebki, ki komunicirajo,
c) stroja stanja aplikacijskega konteksta, ki opredeljuje vedenje aplikacijskega opravila, vidnega med aplikacijskimi osebki, ki komunicirajo, in
d) strojev stanja aplikacijskega razmerja, ki opredeljujejo komunikacijsko vedenje med aplikacijskimi osebki, ki komunicirajo.
Namen tega standarda je opredeliti protokol, ki se zagotavlja za
1) določitev žične predstavitve primitivov opravil iz standarda IEC 61158-5-9 in
2) določitev zunanje vidnega vedenja, povezanega z njihovim prenosom.
Ta standard določa protokol aplikacijskega nivoja procesnih vodil IEC tipa 9 v skladu z osnovnim referenčnim modelom OSI (ISO/IEC 7498-1) in strukturo aplikacijskega nivoja OSI (ISO/IEC 9545).

General Information

Status
Published
Publication Date
19-Feb-2015
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
29-Oct-2014
Due Date
03-Jan-2015
Completion Date
20-Feb-2015

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SLOVENSKI STANDARD
SIST EN 61158-6-9:2015
01-marec-2015
1DGRPHãþD
SIST EN 61158-6-9:2012
Industrijska komunikacijska omrežja - Specifikacije za procesna vodila - 6-9. del:
Specifikacija protokola na aplikacijski ravni - Elementi tipa 9 (IEC 61158-6-9:2014)
Industrial communication networks - Fieldbus specifications - Part 6-9: Application layer
protocol specification - Type 9 elements (IEC 61158-6-9:2014)
Industrielle Kommunikationsnetze - Feldbusse - Teil 6-9: Protokollspezifikation des
Application Layer (Anwendungsschicht) - Typ 9-Elemente (IEC 61158-6-9:2014)
Réseaux de communication industriels - Spécifications des bus de terrain - Partie 6-9:
Spécification du protocole de la couche application - Éléments de type 9 (CEI 61158-6-
9:2014)
Ta slovenski standard je istoveten z: EN 61158-6-9:2014
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 61158-6-9:2015 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 61158-6-9:2015

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SIST EN 61158-6-9:2015


EUROPEAN STANDARD EN 61158-6-9

NORME EUROPÉENNE

EUROPÄISCHE NORM
October 2014
ICS 25.040.40; 35.100.70; 35.110 Supersedes EN 61158-6-9:2012
English Version
Industrial communication networks - Fieldbus specifications -
Part 6-9: Application layer protocol specification - Type 9
elements
(IEC 61158-6-9:2014)
Réseaux de communication industriels - Spécifications des Industrielle Kommunikationsnetze - Feldbusse - Teil 6-9:
bus de terrain - Partie 6-9: Spécification du protocole de la Protokollspezifikation des Application Layer
couche application - Éléments de type 9 (Anwendungsschicht) - Typ 9-Elemente
(CEI 61158-6-9:2014) (IEC 61158-6-9:2014)
This European Standard was approved by CENELEC on 2014-09-23. 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 61158-6-9:2014 E

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SIST EN 61158-6-9:2015
EN 61158-6-9:2014 - 2 -
Foreword
The text of document 65C/764/FDIS, future edition 3 of IEC 61158-6-9, 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 61158-6-9:2014.
The following dates are fixed:
(dop) 2015-06-23
• latest date by which the document has to be implemented at
national level by publication of an identical national
standard or by endorsement
(dow) 2017-09-23
• latest date by which the national standards conflicting with
the document have to be withdrawn

This document supersedes EN 61158-6-9:2012.
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 61158-6-9:2014 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 61158-6-9:2015
- 3 - EN 61158-6-9:2014
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 -  Industrial communication networks - EN 61158-1 -
Fieldbus specifications -
Part 1: Overview and guidance for the
IEC 61158 and IEC 61784 series
IEC 61158-3-1 -  Industrial communication networks - EN 61158-3-1 -
Fieldbus specifications -
Part 3-1: Data-link layer service definition -
Type 1 elements
IEC 61158-4-1 -  Industrial communication networks - EN 61158-4-1 -
Fieldbus specifications -
Part 4-1: Data-link layer protocol
specification - Type 1 elements
IEC 61158-5-5 -  Industrial communication networks - EN 61158-5-5 -
Fieldbus specifications -
Part 5-5: Application layer service
definition - Type 5 elements
IEC 61158-5-9 -  Industrial communication networks - EN 61158-5-9 -
Fieldbus specifications -
Part 5-9: Application layer service
definition - Type 9 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 8824-1 -  Information technology - Abstract Syntax - -
Notation One (ASN.1): Specification of
basic notation

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SIST EN 61158-6-9:2015
EN 61158-6-9:2014 - 4 -
Publication Year Title EN/HD Year
ISO/IEC 8825-1 -  Information technology - ASN.1 encoding - -
rules: Specification of Basic Encoding
Rules (BER), Canonical Encoding Rules
(CER) and Distinguished Encoding Rules
(DER)
ISO/IEC 9545 -  Information technology - Open Systems - -
Interconnection - Application Layer
structure
ISO/IEC 10731 -  Information technology - Open Systems - -
Interconnection - Basic Reference Model -
Conventions for the definition of OSI
services
ISO/IEC/IEEE 60559 -  Information technology - Microprocessor - -
Systems - Floating-Point arithmetic

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SIST EN 61158-6-9:2015



IEC 61158-6-9

®


Edition 3.0 2014-08




INTERNATIONAL



STANDARD




NORME



INTERNATIONALE











Industrial communication networks – Fieldbus specifications –

Part 6-9: Application layer protocol specification – Type 9 elements




Réseaux de communication industriels – Spécifications des bus de terrain –

Partie 6-9: Spécification du protocole de la couche application – Eléments

de type 9















INTERNATIONAL

ELECTROTECHNICAL

COMMISSION


COMMISSION

ELECTROTECHNIQUE

PRICE CODE
INTERNATIONALE

CODE PRIX XD


ICS 25.040.40; 35.100.70; 35.110 ISBN 978-2-8322-1760-3



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

---------------------- Page: 7 ----------------------

SIST EN 61158-6-9:2015
– 2 – IEC 61158-6-9:2014 © IEC 2014
CONTENTS
FOREWORD . 5
INTRODUCTION . 7
1 Scope . 8
1.1 General . 8
1.2 Specifications . 8
1.3 Conformance . 9
2 Normative references . 9
3 Terms, definitions, symbols, abbreviations and conventions . 10
3.1 Terms and definitions from other ISO/IEC standards . 10
3.2 IEC 61158-1 terms . 11
3.3 Abbreviations and symbols . 14
3.4 Conventions . 15
3.5 Conventions used in state machines . 16
4 Abstract syntax . 17
4.1 FAL-AR PDU abstract syntax . 17
4.2 Abstract syntax of PDUBody . 19
4.3 Type definitions for ASEs . 22
4.4 Abstract syntax of data types . 27
5 Transfer syntax . 28
6 Structure of FAL protocol state machines . 39
7 AP-Context state machines . 40
7.1 VCR PM structure . 40
7.2 VCR PM state machine . 41
8 FAL service protocol machine (FSPM) . 53
8.1 General . 53
8.2 FSPM state tables . 53
8.3 Functions used by FSPM . 56
8.4 Parameters of FSPM/ARPM primitives . 56
9 Application relationship protocol machines (ARPMs) . 56
9.1 AREP mapping to data-link layer . 56
9.2 Application relationship protocol machines (ARPMs) . 66
9.3 AREP state machine primitive definitions . 82
9.4 AREP state machine functions . 83
10 DLL mapping protocol machine (DMPM) . 84
10.1 DMPM States . 84
10.2 DMPM state table . 85
10.3 Primitives exchanged between data-link layer and DMPM . 91
10.4 Functions used by DMPM . 93
Bibliography . 95

Figure 1 – Insertion of identification information in the FMS PDU . 29
Figure 2 – Identification . 30
Figure 3 – Coding with identification . 31
Figure 4 – Coding without identification . 31
Figure 5 – Representation of the value true . 31

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SIST EN 61158-6-9:2015
IEC 61158-6-9:2014 © IEC 2014 – 3 –
Figure 6 – Representation of the value false . 31
Figure 7 – Coding of data of data type Integer16 . 32
Figure 8 – Coding of data of data type Unsigned16 . 32
Figure 9 – Coding of data of data type Floating Point . 33
Figure 10 – Coding of data of data type Visible String . 33
Figure 11 – Coding of data of data type Octet String . 34
Figure 12 – Coding of data of type Date . 34
Figure 13 – Coding of data of data type Time-of-day . 35
Figure 14 – Coding of data of data type Time-difference . 36
Figure 15 – Coding of data of data type Bit String . 36
Figure 16 – Coding of data of data type Time-value . 37
Figure 17 – Coding of data of user data definitions with identifier. 37
Figure 18 – Coding of data of user data definitions without identifier . 37
Figure 19 – Coding of ID info for a SEQUENCE . 38
Figure 20 – Relationships among protocol machines and adjacent layers . 39
Figure 21 – Relationships among protocol machines and adjacent layers . 40
Figure 22 – VCR state machine . 41
Figure 23 – State transition diagram of FSPM . 53
Figure 24 – State transition diagram of the QUU ARPM . 67
Figure 25 – State transition diagram of QUB ARPM . 69
Figure 26 – State transition diagram of the BNU ARPM . 77
Figure 27 – State transition diagram of DMPM . 85

Table 1 – Conventions used for state machines . 16
Table 2 – Coding for Date type . 34
Table 3 – AP-VCR state machine transactions . 42
Table 4 – Primitives issued by FAL-User to VCR PM . 51
Table 5 – Primitives issued by VCR PM to FAL-User . 51
Table 6 – Primitives issued by VCR PM to FSPM . 52
Table 7 – Primitives issued by FSPM to VCR PM . 52
Table 8 – FSPM state table – sender transactions . 54
Table 9 – FSPM state table – receiver transactions . 55
Table 10 – Function SelectArep() . 56
Table 11 – Parameters used with primitives exchanged between FSPM and ARPM . 56
Table 12 – QUU ARPM states . 67
Table 13 – QUU ARPM state table – sender transactions . 67
Table 14 – QUU ARPM state table – receiver transactions . 68
Table 15 – QUB ARPM states . 68
Table 16 – QUB ARPM state table – sender transactions . 69
Table 17 – QUB ARPM state table – receiver transactions . 71
Table 18 – BNU ARPM states . 77
Table 19 – BNU ARPM state table – sender transactions . 78
Table 20 – BNU ARPM state table – receiver transactions . 79

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SIST EN 61158-6-9:2015
– 4 – IEC 61158-6-9:2014 © IEC 2014
Table 21 – Primitives issued from ARPM to DMPM . 82
Table 22 – Primitives issued by DMPM to ARPM . 82
Table 23 – Parameters used with primitives exchanged between ARPM and DMPM . 82
Table 24 – Function GetArepId() . 83
Table 25 – Function BuildFAS-PDU . 84
Table 26 – Function FAS_Pdu_Type . 84
Table 27 – Function AbortIdentifier . 84
Table 28 – Function AbortReason . 84
Table 29 – Function AbortDetail . 84
Table 30 – DMPM state descriptions . 85
Table 31 – DMPM state table – sender transactions . 85
Table 32 – DMPM state table – receiver transactions . 88
Table 33 – Primitives exchanged between data-link layer and DMPM . 91
Table 34 – Function PickArep . 93
Table 35 – Function FindAREP . 93
Table 36 – Function LocateQubArep . 94
Table 37 – Function SetIdentifier() . 94

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SIST EN 61158-6-9:2015
IEC 61158-6-9:2014 © IEC 2014 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

INDUSTRIAL COMMUNICATION NETWORKS –
FIELDBUS SPECIFICATIONS –

Part 6-9: Application layer protocol specification –
Type 9 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 61158-6-9 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. The main change with respect to the previous edition is listed
below:

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SIST EN 61158-6-9:2015
– 6 – IEC 61158-6-9:2014 © IEC 2014
• Correct Time-difference valid range
• Correct Table 3 state transition
• Include Transparent timeliness class in BNU AREP formal model
The text of this standard is based on the following documents:
FDIS Report on voting
65C/764/FDIS 65C/774/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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SIST EN 61158-6-9:2015
IEC 61158-6-9:2014 © IEC 2014 – 7 –
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 protocol provides the application service by making use of the services
available from the data-link or other immediately lower layer. The primary aim of this standard
is to provide a set of rules for communication expressed in terms of the procedures to be
carried out by peer application entities (AEs) at the time of communication. These rules for
communication are intended to provide a sound basis for development in order to serve a
variety of purposes:
• as a guide for implementors and designers;
• for use in the testing and procurement of equipment;
• as part of an agreement for the admittance of systems into the open systems environment;
• as a refinement to the understanding of time-critical communications within OSI.
This standard is concerned, in particular, with the communication and interworking of sensors,
effectors and other automation devices. By using this standard together with other standards
positioned within the OSI or fieldbus reference models, otherwise incompatible systems may
work together in any combination.

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SIST EN 61158-6-9:2015
– 8 – IEC 61158-6-9:2014 © IEC 2014
INDUSTRIAL COMMUNICATION NETWORKS –
FIELDBUS SPECIFICATIONS –

Part 6-9: Application layer protocol specification –
Type 9 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 9 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 behavior provided by the Type
9 fieldbus Application Layer in terms of
a) the abstract syntax defining the application layer protocol data units conveyed between
communicating application entities,
b) the transfer syntax defining the application layer protocol data units c
...

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