IEC 61158-6-4:2023
(Main)Industrial communication networks - Fieldbus specifications - Part 6-4: Application layer protocol specification - Type 4 elements
Industrial communication networks - Fieldbus specifications - Part 6-4: Application layer protocol specification - Type 4 elements
IEC 61158-6-4:2023 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 6-4: Spécification du protocole de la couche application - Eléments de type 4
L'IEC 61158-6-4:2023 fournit des éléments communs pour les communications de messagerie prioritaires et non prioritaires élémentaires entre les programmes d’application des environnements d’automatisation et le matériel spécifique au bus de terrain de type 4. Le terme "à temps critique" est utilisé pour indiquer la présence d’une fenêtre temporelle, dans laquelle il est exigé de réaliser une ou plusieurs actions spécifiées selon un niveau défini de certitude. Tout manquement à réaliser ces actions dans la fenêtre de temps prévue risque de provoquer la défaillance des applications qui les demandent, avec le risque de mettre en danger l’équipement, l’usine, voire les personnes.
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IEC 61158-6-4 ®
Edition 4.0 2023-03
INTERNATIONAL
STANDARD
Industrial communication networks – Fieldbus specifications –
Part 6-4: Application layer protocol specification – Type 4 elements
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IEC 61158-6-4 ®
Edition 4.0 2023-03
INTERNATIONAL
STANDARD
Industrial communication networks – Fieldbus specifications –
Part 6-4: Application layer protocol specification – Type 4 elements
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 25.040.40; 35.100.70; 35.110 ISBN 978-2-8322-6632-8
– 2 – IEC 61158-6-4:2023 © IEC 2023
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, abbreviated terms and conventions . 10
3.1 Referenced terms and definitions . 10
3.1.1 ISO/IEC 7498-1 terms . 10
3.1.2 ISO/IEC 8822 terms . 10
3.1.3 ISO/IEC 9545 terms . 10
3.1.4 ISO/IEC 8824-1 terms . 10
3.1.5 Fieldbus data-link layer terms . 11
3.2 Abbreviations and symbols . 11
3.3 Conventions . 12
3.3.1 General concept . 12
3.3.2 Conventions for state machines for Type 4 . 12
4 FAL syntax description . 13
4.1 FAL-AR PDU abstract syntax . 13
4.1.1 General . 13
4.1.2 Abstract syntax of APDU header . 13
4.1.3 Abstract syntax of APDU body . 15
4.2 Data types . 16
5 Transfer syntaxes . 16
5.1 APDU encoding . 16
5.1.1 APDU Header encoding . 16
5.1.2 APDU body encoding . 18
5.2 Variable object encoding and packing . 20
5.2.1 Encoding of simple variables . 20
5.2.2 Encoding of constructed variables . 21
5.2.3 Alignment . 22
5.2.4 Variable object attributes . 24
5.3 Error codes . 25
6 FAL protocol state machines . 26
7 AP-context state machine . 27
8 FAL service protocol machine (FSPM) . 27
8.1 Primitives exchanged between FAL User and FSPM . 27
8.2 FSPM states . 27
8.2.1 General . 27
8.2.2 FSPM proxy object states . 27
8.2.3 FSPM real object state machine description . 32
9 Application relationship protocol machine (ARPM) . 34
9.1 Primitives exchanged between ARPM and FSPM . 34
9.2 ARPM States . 35
9.2.1 General . 35
9.2.2 Sender state transitions . 35
9.2.3 Receiver state transitions . 36
10 DLL mapping protocol machine (DMPM) . 37
10.1 Data-link Layer service selection. 37
10.1.1 General . 37
10.1.2 DL-UNITDATA request . 37
10.1.3 DL-UNITDATA indication . 37
10.1.4 DL-UNITDATA response . 37
10.1.5 DLM-Set primitive and parameters . 37
10.1.6 DLM-Get primitive and parameters . 37
10.2 Primitives exchanged between ARPM and DLPM . 37
10.3 Primitives exchanged between DLPM and data-link layer . 38
10.4 DLPM states . 38
10.4.1 States . 38
10.4.2 Sender state transitions . 38
10.4.3 Receiver state transitions . 39
11 Protocol options. 40
Bibliography . 41
Figure 1 – State transition diagram . 12
Figure 2 – APDU header structure . 16
Figure 3 – Subfields of ControlStatus for Request . 17
Figure 4 – Subfields of ControlStatus for Response with error . 17
Figure 5 – Subfields of ControlStatus for Response with no error . 18
Figure 6 – DataFieldFormat encoding . 18
Figure 7 – Structure of request APDU body . 19
Figure 8 – Structure of response APDU body . 19
Figure 9 – Variable identifier . 19
Figure 10 – Code subfield of variable identifier . 19
Figure 11 – Sequence of data in the APDU body subfield . 21
Figure 12 – MSG consists of APDU header and APDU body . 22
Figure 13 – Summary of FAL architecture . 26
Figure 14 – FSPM proxy object state machine . 28
Figure 15 – FSPM real object state machine . 33
Figure 16 – ARPM state machine . 35
Figure 17 – DLPM state machine . 38
Table 1 – State machine description elements . 12
Table 2 – APDU header . 13
Table 3 – APDU body . 15
Table 4 – Transfer syntax for Array . 23
Table 5 – Transfer syntax for Structure . 23
Table 6 – Common variable object attributes . 24
Table 7 – Variable type identifiers . 24
Table 8 – FIFO variable object attributes . 25
– 4 – IEC 61158-6-4:2023 © IEC 2023
Table 9 – Error codes . 25
Table 10 – Primitives exchanged between FAL-User and FSPM . 27
Table 11 – REQUEST.req FSPM constraints . 28
Table 12 – REQUEST.req FSPM actions . 29
Table 13 – RESPONSE.cnf FSPM constraints . 31
Table 14 – RESPONSE.cnf FSPM actions .
...
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