IEC 61158-6-28:2023

Industrial communication networks - Fieldbus specifications - Part 6-28: Application layer protocol specification - Type 28 elements

IEC 61158-6-28:2023 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 28 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 can cause 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 6-28: Spécification du protocole de la couche application - Éléments de type 28

L’IEC 61158-6-28:2023 donne les éléments communs visant à assurer les communications de messagerie de base prioritaires et non prioritaires entre les programmes d’application d’un environnement d’automatisation et d’un matériel spécifique au bus de terrain de type 28. Le terme "prioritaire" 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. La non-réalisation des actions spécifiées dans la fenêtre temporelle peut provoquer la défaillance des applications qui les demandent, avec les risques associés pour l’équipement, l’usine, voire les personnes.

General Information

• Status: Published
• Publication Date: 23-Mar-2023
• ICS: 25.040 - Industrial automation systems
• Technical Committee: SC 65C - Industrial networks
• Drafting Committee: WG 9 - TC 65/SC 65C/WG 9
• Current Stage: PPUB - Publication issued
• Start Date: 31-Mar-2023
• Completion Date: 24-Mar-2023

Standards Content (Sample)

IEC 61158-6-28 ®
Edition 1.0 2023-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Industrial communication networks – Fieldbus specifications –
Part 6-28: Application layer protocol specification – Type 28 elements

Réseaux de communication industriels – Spécifications des bus de terrain –
Partie 6-28: Spécification du protocole de la couche application – Éléments de
type 28
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IEC 61158-6-28 ®
Edition 1.0 2023-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Industrial communication networks – Fieldbus specifications –

Part 6-28: Application layer protocol specification – Type 28 elements

Réseaux de communication industriels – Spécifications des bus de terrain –

Partie 6-28: Spécification du protocole de la couche application – Éléments de

type 28
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 25.040 ISBN 978-2-8322-6621-2

– 2 – IEC 61158-6-28:2023 © IEC 2023
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
1.1 Overview. 7
1.2 Specifications . 7
1.3 Conformance . 8
2 Normative references . 8
3 Terms, definitions, symbols, abbreviated terms and conventions . 9
3.1 Terms and definitions from other ISO/IEC standards . 9
3.1.1 Terms and definitions from ISO/IEC 7498-1 . 9
3.1.2 Terms and definitions from ISO/IEC 9545 . 9
3.1.3 Terms and definitions from ISO/IEC 8824-1 . 9
3.1.4 Terms and definitions from ISO/IEC 8825-7 . 9
3.1.5 Terms and definitions from IEC 61158-5 . 10
3.2 Type 28 fieldbus application-layer specific definitions . 10
3.3 Abbreviations and symbols . 10
3.4 Conventions . 11
3.4.1 General concept . 11
3.4.2 Conventions for class definitions . 11
3.4.3 Abstract syntax conventions . 11
3.5 Conventions used in state machines . 11
3.5.1 State machine conventions for Type 28 . 11
4 APDU structure . 12
4.1 APDU header . 12
4.2 DTU APDU . 14
4.3 Time service notification APDU . 15
4.4 System management APDU . 16
5 State machine . 17
5.1 Publisher state machine . 17
5.2 Subscriber state machine . 19
5.3 Client state machine . 20
5.4 Server state machine . 21
5.5 ALCE state machine . 22
5.6 ALDE state machine . 22
5.7 ALME state machine . 23
Bibliography . 25

Figure 1 – APDU header structure . 12
Figure 2 – APDU structure of multiple DTUs . 14
Figure 3 – Transmission unit APDU structure . 14
Figure 4 – Time service notification APDU structure . 15
Figure 5 – System management data APDU structure . 17
Figure 6 – Diagram of state transition of publisher state machine . 18
Figure 7 – Diagram of state transition of subscriber state machine . 20
Figure 8 – Diagram of state transition of client state machine . 21

Figure 9 – Diagram of transition state of server state machine . 21
Figure 10 – Diagram of transition state of ALCE state machine . 22
Figure 11 – Diagram of transition state of ALDE state machine . 23
Figure 12 – Diagram of state transition for ALME state machine . 24

Table 1 – State machine description elements . 11
Table 2 – AL service type flag encoding . 12
Table 3 – State transition table of publisher state machine . 18
Table 4 – State transition table of subscriber state machine . 19
Table 5 – State transition table of client state machine . 20
Table 6 – State transition table of server state machine . 21
Table 7 – State transition table of ALCE state machine . 22
Table 8 – State transition table of ALDE state machine . 23
Table 9 – State transition table of ALME state machine . 24

– 4 – IEC 61158-6-28:2023 © IEC 2023
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
INDUSTRIAL COMMUNICATION NETWORKS –
FIELDBUS SPECIFICATIONS –
Part 6-28: Application layer protocol specification –
Type 28 elements
FOREWORD
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