IEC 61158-4-28:2023

Industrial communication networks - Fieldbus specifications - Part 4-28: Data-link layer protocol specification - Type 28 elements

IEC 61558-4-28:2023 provides a means of connecting devices through a partial mesh network, such that most failures of an interconnection between two devices can be circumvented. In common practice, the devices are interconnected in a non-redundant hierarchical manner reflecting application needs.

Réseaux de communication industriels - Spécifications des bus de terrain - Partie 4-28: Spécification du protocole de la couche liaison de données - Éléments de type 28

L’IEC 61158-4-28:2023 fournit un moyen de connexion des appareils par l’intermédiaire d’un réseau maillé partiel, de telle sorte que la plupart des défaillances d’une interconnexion entre deux appareils puissent être contournées. Dans la pratique courante, les appareils sont interconnectés d’une manière hiérarchique non redondante reflétant les besoins de l’application.

General Information

• Status: Published
• Publication Date: 06-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: 07-Mar-2023

Standards Content (Sample)

IEC 61158-4-28
®

Edition 1.0 2023-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Industrial communication networks – Fieldbus specifications –
Part 4-28: Data-link layer protocol specification – Type 28 elements

Réseaux de communication industriels – Spécifications des bus de terrain –
Partie 4-28: Spécification du protocole de la couche liaison de données –
Éléments de type 28

IEC 61158-4-28:2023-03(en-fr)

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IEC 61158-4-28

®


Edition 1.0 2023-03




INTERNATIONAL



STANDARD




NORME


INTERNATIONALE
colour

inside










Industrial communication networks – Fieldbus specifications –

Part 4-28: Data-link layer protocol specification – Type 28 elements



Réseaux de communication industriels – Spécifications des bus de terrain –

Partie 4-28: Spécification du protocole de la couche liaison de données –

Éléments de type 28















INTERNATIONAL

ELECTROTECHNICAL

COMMISSION


COMMISSION

ELECTROTECHNIQUE


INTERNATIONALE




ICS 25.040 ISBN 978-2-8322-6557-4




Warning! Make sure that you obtained this publication from an authorized distributor.

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® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale

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– 2 – IEC 61158-4-28:2023 © IEC 2023
CONTENTS
FOREWORD . 5
INTRODUCTION . 7
1 Scope . 8
1.1 General . 8
1.2 Specifications . 8
1.3 Procedures . 8
1.4 Applicability . 8
1.5 Conformance . 8
2 Normative references . 9
3 Terms, definitions, symbols, abbreviated terms and conventions . 9
3.1 Reference model terms and definitions . 9
3.2 Service convention terms and definitions . 11
3.3 Common terms and definitions . 12
3.4 Additional Type 28 terms and definitions . 13
3.5 Additional Type 28 symbols and abbreviations . 15
4 Overview of the DL-protocol . 16
4.1 DLL protocol architecture . 16
4.2 DLL working mechanism . 18
4.2.1 Node . 18
4.2.2 Addressing . 18
4.2.3 Multicast . 19
4.2.4 Resource mapping and scheduling . 19
5 DLPDU structure . 21
5.1 Universal DLPDU structure . 21
5.2 Basic configuration DLPDU . 23
5.3 Address assignment DLPDU . 25
5.4 Multicast assignment DLPDU . 25
5.5 Resource allocation DLPDU . 26
5.6 Access notification DLPDU . 28
5.7 Resource application DLPDU . 29
5.8 Resource release DLPDU . 30
5.9 Status query DLPDU . 30
5.10 Status response DLPDU . 31
5.11 Announcement DLPDU . 32
5.12 Clock synchronization DLPDU. 33
5.13 Common DLPDU . 34
6 Working procedure . 35
6.1 Initialization procedure . 35
6.1.1 Basic configuration . 35
6.1.2 Resource mapping configuration . 35
6.2 DLL node management procedure . 37
6.2.1 DLL maintenance . 37
6.2.2 Node join . 38
6.2.3 Node query . 39
6.2.4 Node leave . 39
6.3 Data transmission procedure . 40

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IEC 61158-4-28:2023 © IEC 2023 – 3 –
6.4 Clock synchronization procedure . 42
7 State machine . 44
7.1 DLDE state machine . 44
7.2 DLME state machine . 47
7.3 DLCE state machine . 48
8 Error handling . 49
8.1 General . 49
8.2 Possible sources and characteristics of errors . 49
8.3 Error handling of MN / TN . 50
8.4 PhL error source . 50
8.4.1 General . 50
8.4.2 Lost connection . 50
8.4.3 CRC error . 50
8.4.4 Buffer overflow . 50
8.4.5 Symbol resource conflict . 50
8.4.6 Symbol resource insufficient . 50
Annex A (informative) Example for NodeID and MAC address mapping . 51
Annex B (informative) Example for multicast group working mechanism . 52
Bibliography . 53

Figure 1 – Relationships of DLSAPs, DLSAP-addresses and group DL-addresses . 12
Figure 2 – Bitmap data type diagram. 15
Figure 3 – DLL in Type 28 protocol stack architecture . 16
Figure 4 – Relationship of the fieldbus DLL to other fieldbus layers and to users of the
fieldbus DLS . 17
Figure 5 – Type 28 DLL protocol architecture diagram . 17
Figure 6 – Resource mapping between DLL and PhL . 20
Figure 7 – DLL resource mapping message queue scheduling diagram . 21
Figure 8 – Universal DLPDU structure . 22
Figure 9 – Basic configuration DLPDU structure . 23
Figure 10 – General configuration block structure . 24
Figure 11 – Address allocation DLPDU structure. 25
Figure 12 – Multicast assignment DLPDU structure. 26
Figure 13 – Resource allocation DLPDU structure . 27
Figure 14 – Access notification DLPDU structure . 28
Figure 15 – Resource application DLPDU structure. 29
Figure 16 – Resource release DLPDU structure . 30
Figure 17 – Status query DLPDU structure . 31
Figure 18 – Status response DLPDU structure . 31
Figure 19 – Announcement DLPDU structure . 32
Figure 20 – Clock synchronization DLPDU structure . 34
Figure 21 – Common DLPDU structure . 35
Figure 22 – Resource mapping configuration diagram . 36
Figure 23 – Initial access configuration procedure diagram . 37
Figure 24 – The random access configuration procedure diagram . 38

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Figure 25 – Node leave procedure diagram . 40
Figure 26 – DLS data sending procedure diagram . 41
Figure 27 – DLS data receiving procedure diagram . 42
Figure 28 – Clock synchronization delay measurement procedure diagram . 43
Figure 29 – Clock register structure diagram . 43
Figure 30 – Clock synchronization procedure . 44
Figure 31 – DLDE state machine . 45
Figure 32 – DLME state machine . 47
Figure 33 – DLCE state machine . 48
Figure B.1 – Multicast working mechanism diagram . 52

Table 1 – NodeID address assignment of Type 28 DLL . 18
Table 2 – NodeID and MAC address mapping table . 18
Table 3 – Members of multicast group mapping table . 19
Table 4 – DLDE state transition . 46
Table 5 – DLME state machine state transition . 48
Table 6 – DLCE state machine state transition . 49
Table A.1 – Example of NodeID and MAC address mapping table saved on TN . 51

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IEC 61158-4-28:2023 © IEC 2023 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

INDUSTRIAL COMMUNICATION NETWORKS –
FIELDBUS SPECIFICATIONS –

Part 4-28: Data-link layer protocol specification –
Type 28 elements

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
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6) All users should ensure that they have the latest edition of this publication.
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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 the IEC 61784-1 series and the IEC 61784-2 series.
IEC 61158-4-28 has been prepared by subcommittee 65C: Industrial networks, of IEC technical
committee 65: Industrial-process measurement, control and automation. It is an International
Standard.

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– 6 – IEC 61158-4-28:2023 © IEC 2023
The text of this International Standard is based on the following documents:
Draft Report on voting
65C/1206/FDIS 65C/1235/RVD

Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/publications.
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 document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
 reconfirmed,
 withdrawn,
 replaced by a revised edition, or
 amended.

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IEC 61158-4-28:2023 © IEC 2023 – 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 data-link protocol provides the data-link service by making use of the services available
from the physical layer. The primary aim of this document is to provide a set of rules for
communication expressed in terms of the procedures to be carried out by peer data-link entities
(DLEs) 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:
a) as a guide for implementers and designers;
b) for use in the testing and procurement of equipment;
c) as part of an agreement for the admittance of systems into the open systems environment;
d) as a refinement to the understanding of time-critical communications within OSI.
This document is concerned, in particular, with the communication and interworking of sensors,
effectors and other automation devices. By using this document together with other standard
positioned within the OSI or fieldbus reference models, otherwise incompatible systems could
work together in any combination.

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– 8 – IEC 61158-4-28:2023 © IEC 2023
INDUSTRIAL COMMUNICATION NETWORKS –
FIELDBUS SPECIFICATIONS –

Part 4-28: Data-link layer protocol specification –
Type 28 elements



1 Scope
1.1 General
The data-link layer provides several types of messaging communications between devices in
an automation environment.
This part of IEC 61158 provides a means of connecting devices through a partial mesh network,
such that most failures of an interconnection between two devices can be circumvented. In
common practice, the devices are interconnected in a non-redundant hierarchical manner
reflecting application needs.
1.2 Specifications
This document specifies
a) procedures for the timely transfer of data and control information from one data-link user
entity to a peer user entity, and among the data-link entities forming the distributed data-
link service provider;
b) the structure of the fieldbus DLPDUs used for the transfer of data and control information
by the protocol of this document, and their representation as physical interface data units.
1.3 Procedures
The procedures are defined in terms of
a) the interactions between peer DL-entities (DLEs) through the exchange of the fieldbus
DLPDUs;
b) the interactions between a DL-service (DLS) provider and a DLS-user in the same system
through the exchange of DLS primitives;
c) the interactions between a DLS-provider and a Ph-service provider in the same system
through the exchange of Ph-service primitives.
1.4 Applicability
These procedures are applicable to instances of communication between systems which
support time-critical communications services within the data-link layer of the OSI or the
fieldbus reference models, and which require the ability to interconnect in an open systems
interconnection environment.
1.5 Conformance
This document also specifies conformance requirements for systems implementing these
procedures. This document does not contain tests to demonstrate compliance with such
requirements.

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IEC 61158-4-28:2023 © IEC 2023 – 9 –
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies.
For undated references, the latest edition of the referenced document (including any
amendments) applies.
NOTE All parts of the IEC 61158 series, as well as the IEC 61784-1 series and the IEC 61784-2 series are
maintained simultaneously. Cross-references to these documents within the text therefore refer to the editions as
dated in this list of normative references.
IEC 61158-2:2023, Industrial communication networks – Fieldbus specifications – Part 2:
Physical layer specification and service definition
IEC 61158-3-28:2023, Industrial communication networks – Fieldbus specifications – Part 3-28:
Data-link layer service definition – Type 28 elements
ISO/IEC 7498-1:1994, Information technology – Open Systems Interconnection – Basic
Reference Model – Basic Reference Model: The Basic Model
ISO/IEC 7498-3:1997, Information technology – Open Systems Interconnection – Basic
Reference Model: Naming and addressing
ISO/IEC 10731:1994, Information technology – Open Systems Interconnection – Basic
Reference Model – Conventions for the definition of OSI services
ISO/IEC 8886:1996, Information technology – Open Sys
...