IEC 61158-5-4:2023
(Main)Industrial communication networks - Fieldbus specifications - Part 5-4: Application layer service definition - Type 4 elements
Industrial communication networks - Fieldbus specifications - Part 5-4: Application layer service definition - Type 4 elements
IEC 61158-5-4:2023 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 4 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.
Réseaux de communication industriels - Spécifications des bus de terrain - Partie 5-4: Définition des services de la couche application - Éléments de type 4
L'IEC 61158-5-4:2023 fournit des éléments communs pour les communications prioritaires ou non entre des programmes d’application dans un environnement et avec un matériel d’automatisation spécifiques aux bus de terrain de type 4. Le terme "prioritaire" signale l’existence d’une fenêtre temporelle dans laquelle une ou plusieurs actions spécifiées doivent être réalisées, avec un niveau de certitude défini. Si les actions spécifiées ne sont pas réalisées dans la fenêtre temporelle, les applications demandant les actions risquent de connaître une défaillance, avec les risques que cela comporte pour les équipements, les installations et éventuellement la vie humaine.
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IEC 61158-5-4 ®
Edition 4.0 2023-03
INTERNATIONAL
STANDARD
Industrial communication networks – Fieldbus specifications –
Part 5-4: Application layer service definition – Type 4 elements
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IEC 61158-5-4 ®
Edition 4.0 2023-03
INTERNATIONAL
STANDARD
Industrial communication networks – Fieldbus specifications –
Part 5-4: Application layer service definition – Type 4 elements
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 25.040.40; 35.100.70; 35.110 ISBN 978-2-8322-6572-7
– 2 – IEC 61158-5-4:2023 © IEC 2023
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, symbols, abbreviated terms and conventions . 9
3.1 ISO/IEC 7498-1 terms . 9
3.2 ISO/IEC 8822 terms . 9
3.3 ISO/IEC 9545 terms . 10
3.4 ISO/IEC 8824-1 terms . 10
3.5 Fieldbus data-link layer terms . 10
3.6 Fieldbus application layer specific definitions . 10
3.7 Abbreviations and symbols . 16
3.8 Conventions . 17
3.8.1 Overview . 17
3.8.2 General conventions . 18
3.8.3 Conventions for class definitions . 18
3.8.4 Conventions for service definitions . 19
4 Concepts . 20
4.1 Overview. 20
4.2 Architectural relationships . 21
4.2.1 Relationship to the Application Layer of the OSI basic reference model . 21
4.2.2 Relationships to other fieldbus entities. 21
4.3 Fieldbus Application Layer structure . 23
4.3.1 Overview . 23
4.3.2 Fundamental concepts . 23
4.3.3 Fieldbus application processes . 23
4.3.4 Application process objects . 27
4.3.5 Application entities . 29
4.3.6 Fieldbus application service elements . 30
4.3.7 Application relationships . 33
4.4 Fieldbus Application Layer naming and addressing . 35
4.4.1 General . 35
4.4.2 Identifying objects accessed through the FAL . 35
4.4.3 Addressing APs accessed through the FAL. 36
4.5 Architecture summary . 36
4.6 FAL service procedures . 36
4.6.1 FAL confirmed service procedures . 36
4.6.2 FAL unconfirmed service procedures . 37
4.7 Common FAL attributes . 37
4.8 Common FAL service parameters . 38
4.9 APDU size . 39
5 Type 4 communication model specification . 39
5.1 Concepts . 39
5.1.1 Overview . 39
5.1.2 Application entities . 39
5.1.3 Gateway and routing . 41
5.1.4 Architecture summary . 42
5.1.5 FAL service procedures and time sequence diagrams . 43
5.2 Variable ASE . 45
5.2.1 Variable types. 45
5.2.2 Variable model class specification . 47
5.2.3 Basic variable type specifications . 48
5.2.4 Constructed variable type specifications . 53
5.2.5 Route endpoint ASE . 57
5.2.6 Route endpoint ASE service specification . 60
5.3 Application relationship ASE . 64
5.3.1 Overview . 64
5.3.2 Application relationship class specification . 64
5.3.3 Application relationship ASE service specifications . 66
Bibliography . 71
Figure 1 – Relationship to the OSI basic reference model . 21
Figure 2 – Architectural positioning of the fieldbus Application Layer . 22
Figure 3 – Client/server interactions. 24
Figure 4 – Pull model interactions . 25
Figure 5 – Push model interactions . 26
Figure 6 – APOs services conveyed by the FAL . 28
Figure 7 – Application entity structure . 29
Figure 8 – Example FAL ASEs . 31
Figure 9 – FAL management of objects . 31
Figure 10 – ASE service conveyance . 32
Figure 11 – Defined and established AREPs . 35
Figure 12 – FAL architectural components . 36
Figure 13 – FAL AE . 40
Figure 14 – Summary of the FAL architecture . 42
Figure 15 – FAL service procedure overview . 43
Figure 16 – Time sequence diagram for the confirmed services . 44
Figure 17 – Time sequence diagram for unconfirmed services . 45
Table 1 – REQUEST service parameters . 60
Table 2 – RESPONSE service parameters . 61
Table 3 – Error codes by source . 62
Table 4 – Reserve REP service parameters . 62
Table 5 – Free AREP service parameters . 63
Table 6 – Get REP attribute service parameters . 63
Table 7 – Set REP attribute service parameters . 64
Table 8 – AR send service parameters. 68
Table 9 – AR acknowledge service parameters . 68
Table 10 – AR get attributes service parameters . 69
Table 11 – AR set attributes service parameters . 69
– 4 – IEC 61158-5-4:2023 © IEC 2023
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
INDUSTRIAL COMMUNICATION NETWORKS –
FIELDBUS SPECIFICATIONS –
Part 5-4: Application layer service definition –
Type 4 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 an
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