IEC 61158-5-4:2023

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
...