IEC 61158-3-4:2023
(Main)Industrial communication networks - Fieldbus specifications - Part 3-4: Data-link layer service definition - Type 4 elements
Industrial communication networks - Fieldbus specifications - Part 3-4: Data-link layer service definition - Type 4 elements
IEC 61158-3-4:2023 provides common elements for basic time-critical messaging communications between devices in an automation environment. 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.
This document defines in an abstract way the externally visible services provided by the Type 4 fieldbus data-link layer in terms of
the primitive actions and events of the services;
the parameters associated with each primitive action and event, and the form which they take; and
the interrelationship between these actions and events, and their valid sequences.
The purpose of this document is to define the services provided to
the Type 4 fieldbus application layer at the boundary between the application and data-link layers of the fieldbus reference model;
systems management at the boundary between the data-link layer and systems management of the fieldbus reference model.
Réseaux de communication industriels - Spécifications des bus de terrain - Partie 3-4: Définition des services de la couche liaison de données - Éléments de type 4
L’IEC 61158-3-4:2023 fournit les éléments communs pour les communications de messagerie prioritaires entre les appareils d’un environnement d’automatisation. 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 induit un risque de défaillance des applications qui demandent ces actions, avec les risques qui en découlent pour l’équipement, les installations et éventuellement la vie humaine.
Le présent document définit de manière abstraite les services visibles externes fournis par la couche liaison de données de bus de terrain de type 4, concernant:
les actions et événements liés aux primitives du service;
les paramètres associés à chaque action et événement de primitive, ainsi que la forme prise par ces paramètres; et
l’interrelation entre ces actions et événements, et leurs séquences valides.
Le présent document a pour objet de définir les services fournis:
la couche application de bus de terrain de type 4 à la limite entre les couches application et liaison de données du modèle de référence de bus de terrain;
la gestion-système à la frontière entre la couche liaison de données et la gestion-système du modèle de référence de bus de terrain.
General Information
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Standards Content (Sample)
IEC 61158-3-4 ®
Edition 4.0 2023-03
INTERNATIONAL
STANDARD
Industrial communication networks – Fieldbus specifications –
Part 3-4: Data-link layer service definition – Type 4 elements
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IEC 61158-3-4 ®
Edition 4.0 2023-03
INTERNATIONAL
STANDARD
Industrial communication networks – Fieldbus specifications –
Part 3-4: Data-link layer service definition – Type 4 elements
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 25.040.40; 35.100.20; 35.110 ISBN 978-2-8322-6575-8
– 2 – IEC 61158-3-4:2023 © IEC 2023
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
1.1 General . 7
1.2 Specifications . 7
1.3 Conformance . 7
2 Normative references . 8
3 Terms, definitions, symbols, abbreviated terms and conventions . 8
3.1 Reference model terms and definitions . 8
3.2 Service convention terms and definitions . 9
3.3 Data-link service terms and definitions . 10
3.4 Symbols and abbreviations . 12
3.5 Conventions . 13
4 Data-link service and concepts . 14
4.1 Overview. 14
4.1.1 General . 14
4.1.2 Overview of DL-naming (addressing) . 14
4.2 Types and classes of data-link service . 15
4.3 Functional classes . 15
4.4 Facilities of the connectionless-mode data-link service . 15
4.5 Model of the connectionless-mode data-link service . 15
4.5.1 General . 15
4.5.2 Unconfirmed request . 15
4.5.3 Confirmed request . 16
4.6 Sequence of primitives . 16
4.6.1 Constraints on sequence of primitives . 16
4.6.2 Relation of primitives at the end-points of connectionless service . 17
4.6.3 Sequence of primitives at one DLSAP. 18
4.7 Connectionless-mode data transfer functions . 18
4.7.1 General . 18
4.7.2 Types of primitives and parameters . 18
5 DL-management service . 21
5.1 Scope and inheritance . 21
5.2 Facilities of the DL-management service . 21
5.3 Model of the DL-management service . 21
5.4 Constraints on sequence of primitives . 21
5.5 Set . 22
5.5.1 Function . 22
5.5.2 Types of parameters . 22
5.6 Get . 23
5.6.1 Function . 23
5.6.2 Types of parameters . 23
5.7 Action . 23
5.7.1 Function . 23
5.7.2 Types of parameters . 24
5.7.3 Sequence of primitives . 24
5.8 Event . 25
5.8.1 Function . 25
5.8.2 Types of parameters . 25
Bibliography . 26
Figure 1 – Relationship of PhE, DLE and DLS-users . 14
Figure 2 – Confirmed and unconfirmed UNITDATA request time-sequence diagram . 17
Figure 3 – Repeated confirmed request time-sequence diagram . 17
Figure 4 – State transition diagram for sequences of primitives at one DLSAP . 18
Figure 5 – Sequence of primitives for the DLM action service . 21
Table 1 – Summary of DL-connectionless-mode primitives and parameters . 17
Table 2 – Unitdata transfer primitives and parameters . 18
Table 3 – Control-status error codes . 20
Table 4 – Summary of DL-management primitives and parameters . 22
Table 5 – DLM-Set primitive and parameters . 22
Table 6 – DLM-Get primitive and parameters . 23
Table 7 – DLM-Action primitive and parameters . 24
Table 8 – DLM-Event primitive and parameters . 25
– 4 – IEC 61158-3-4:2023 © IEC 2023
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
INDUSTRIAL COMMUNICATION NETWORKS –
FIELDBUS SPECIFICATIONS –
Part 3-4: Data-link layer service definition –
Type 4 elements
FOREWORD
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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 61158-3-4 has been prepared by subcommittee 65C: Industrial networks, of IEC technical
committee 65: Industrial-process measurement, control and automation. It is an International
Standard.
This fourth edition cancels and replaces the third edition published in 2019. This edition
constitutes a technical revision.
This edition includes the following significant technical change with respect to the previous
edition:
a) Use of extended data size for DLS-user data. This extension is restricted to nodes operating
on a P-NET IP network.
The text of this International Standard is based on the following documents:
Draft Report on voting
65C/1201/FDIS 65C/1242/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 the parts of the IEC 61158 series, 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.
– 6 – IEC 61158-3-4:2023 © IEC 2023
INTRODUCTION
This document 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.
Throughout the set of fieldbus standards, the term "service" refers to the abstract capability
provided by one layer of the OSI Basic Reference Model to the layer immediately above. Thus,
the data-link layer service defined in this document is a conceptual architectural service,
independent of administrative and implementation divisions.
INDUSTRIAL COMMUNICATION NETWORKS –
FIELDBUS SPECIFICATIONS –
Part 3-4: Data-link layer service definition –
Type 4 elements
1 Scope
1.1 General
This part of IEC 61158 provides common elements for basic time-critical messaging
communications between devices in an automation environment. 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.
This document defines in an abstract way the externally visible services provided by the Type
4 fieldbus data-link layer in terms of
a) the primitive actions and events of the services;
b) the parameters associated with each primitive action and event, and the form which they
take; and
c) the interrelationship between these actions and events, and their valid sequences.
The purpose of this document is to define the services provided to
• the Type 4 fieldbus application layer at the boundary between the application and data-link
layers of the fieldbus reference model;
• systems management at the boundary between the data-link layer and systems
management of the fieldbus reference model.
1.2 Specifications
The principal objective of this document is to specify the characteristics of conceptual data-link
layer services suitable for time-critical communications, and thus supplement the OSI Basic
Reference Model in guiding the development of data-link protocols for time-critical
communications. A secondary objective is to provide migration paths from previously-existing
industrial communications protocols.
This document can be used as the basis for formal DL-Programming-Interfaces. Nevertheless,
it is not a formal programming interface, and any such interface will need to address
implementation issues not covered by this specification, including
a) the sizes and octet ordering of various multi-octet service parameters;
b) the correlation of paired request and confirm, or indication and response, primitives.
1.3 Conformance
This document does not specify individual implementations or products, nor does it constrain
the implementations of data-link entities within industrial automation systems.
There is no conformance of equipment to this data-link layer service definition standard.
Instead, conformance is achieved through implementation of the corresponding data-link
protocol that fulfills the Type 4 data-link layer services defined in this document.
– 8 – IEC 61158-3-4:2023 © IEC 2023
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.
ISO/IEC 7498-1, Information technology – Open Systems Interconnection – Basic Reference
Model: The Basic Model
ISO/IEC 7498-3, 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
3 Terms, definitions, symbols, abbreviated terms and conventions
For the purposes of this document, the following terms, definitions, symbols, abbreviated terms
and conventions apply.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at https://www.electropedia.org/
• ISO Online browsing platform: available at https://www.iso.org/obp
3.1 Reference model terms and definitions
This document is based in part on the concepts developed in ISO/IEC 7498-1 and
ISO/IEC 7498-3, and makes use of the following terms defined therein.
3.1.1 DL-address [7498-3]
3.1.2 DL-address-mapping [7498-1]
3.1.3 called-DL-address [7498-3]
3.1.4 calling-DL-address [7498-3]
3.1.5 centralized multi-end-point-connection [7498-1]
3.1.6 correspondent (N)-entities [7498-1]
correspondent DL-entities (N=2)
correspondent Ph-entities (N=1)
3.1.7 DL-connection [7498-1]
3.1.8 DL-connection-end-point [7498-1]
3.1.9 DL-connection-end-point-identifier [7498-1]
3.1.10 DL-connection-mode transmission [7498-1]
3.1.11 DL-connectionless-mode transmission [7498-1]
3.1.12 DL-duplex-transmission [7498-1]
3.1.13 (N)-entity [7498-1]
DL-entity (N=2)
Ph-entity (N=1)
3.1.14 DL-facility
[7498-1]
3.1.15 flow control [7498-1]
3.1.16 (N)-layer [7498-1]
DL-layer (N=2)
Ph-layer (N=1)
3.1.17 layer-management [7498-1]
3.1.18 DL-local-view
[7498-3]
3.1.19 DL-name [7498-3]
3.1.20 naming-(addressing)-domain
[7498-3]
3.1.21 primitive name [7498-3]
3.1.22 DL-protocol
[7498-1]
3.1.23 DL-protocol-connection-identifier [7498-1]
3.1.24 DL-protocol-data-unit [7498-1]
3.1.25 DL-relay [7498-1]
3.1.26 Reset
[7498-1]
3.1.27 responding-DL-address [7498-3]
3.1.28 routing
[7498-1]
3.1.29 segmenting [7498-1]
3.1.30 (N)-service [7498-1]
DL-service (N=2)
Ph-service (N=1)
3.1.31 (N)-service-access-point [7498-1]
DL-service-access-point (N=2)
Ph-service-access-point (N=1)
3.1.32 DL-service-access-point-address
[7498-3]
3.1.33 DL-service-connection-identifier [7498-1]
3.1.34 DL-service-data-unit
[7498-1]
3.1.35 DL-simplex-transmission [7498-1]
3.1.36 DL-subsystem [7498-1]
3.1.37 systems-management [7498-1]
3.1.38 DLS-user-data
[7498-1]
3.2 Service convention terms and definitions
This document also makes use of the following terms defined in ISO/IEC 10731 as they apply
to the data-link layer:
– 10 – IEC 61158-3-4:2023 © IEC 2023
3.2.1 acceptor
3.2.2 confirm (primitive);
requestor.deliver (primitive)
3.2.3 deliver (primitive)
3.2.4 DL-confirmed-facility
3.2.5 DL-facility
3.2.6 DL-local-view
3.2.7 DL-mandatory-facility
3.2.8 DL-non-confirmed-facility
3.2.9 DL-service-primitive;
primitive
3.2.10 DL-service-provider
3.2.11 DL-service-user
3.2.12 DLS-user-optional-facility
3.2.13 indication (primitive);
acceptor.deliver (primitive)
3.2.14 request (primitive);
requestor.submit (primitive)
3.2.15 requestor
3.2.16 response (primitive);
acceptor.submit (primitive)
3.2.17 submit (primitive)
3.3 Data-link service terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.3.1
broadcast-node-address
address used to designate all DLEs on a link
Note 1 to entry: All DLEs on a link receive all DLPDUs where the first node-address is equal to the broadcast-node-
address. Such DLPDUs are always unconfirmed, and their receipt is never acknowledged. The value of the broadcast-
node-address is 126.
3.3.2
destination-DL-route
sequence of DL-route-elements, describing the complete route to the destination
Note 1 to entry: This includes both the destination DLSAP and a local component meaningful to the destination
DLS-user.
3.3.3
DL-route-element
octet holding a node DL-address or an address used by the DLS-user
3.3.4
DLSAP
distinctive point at which DL-services are provided by a single DL-entity to a single higher-layer
entity
3.3.5
DL(SAP)-address
individual DLSAP-address, designating a single DLSAP of a single DLS-user
3.3.6
DLS-user address
uniquely identifies a DLS-user locally
3.3.7
frame
denigrated synonym for DLPDU
3.3.8
full DL-route
combination of a destination-DL-route and a source-DL-route
3.3.9
local link
single DL-subnetwork in which any of the connected DLEs may communicate directly, without
any intervening DL-relaying, whenever all of those DLEs that are participating in an instance of
communication are simultaneously attentive to the DL-subnetwork during the period(s) of
attempted communication
3.3.10
maximum-indication-delay
time value that indicates to the DLS-user the maximum time interval for the DLS-user to prepare
a response after receiving an indication requiring a response
Note 1 to entry: If the DLS-user is unable to prepare a response within maximum-indication-delay, the DLS-user is
required to issue a DL-UNITDATA request with a DLSDU type indicating ACKNOWLEDGE. As a result the DLE will
transmit an acknowledging DLPDU on the link.
3.3.11
maximum-retry-time
time value that indicates to the DLE for how long time retransmission of the request can be
performed, as a result of Wait acknowledges from the remote DLE or DLS-user
3.3.12
no-confirm-node-address
node address which indicates that a request or response is unconfirmed
Note 1 to entry: The value of the no-confirm-node-address is 0.
3.3.13
node
single DL-entity as it appears on one local link
3.3.14
node-address
value that uniquely identifies a DLE on a link
Note 1 to entry: The value of a Node-address is in the range of 0-127. The values 0, 126 and 127 are reserved for
special purposes.
– 12 – IEC 61158-3-4:2023 © IEC 2023
3.3.15
normal class device
device which replies to requests from other normal class devices, and initiates transmissions
Note 1 to entry: Such a device can act as a server (responder) and as a client (requestor) – this is also called a
peer.
3.3.16
receiving DLS-user
DL-service user that acts as a recipient of DLS-user-data
Note 1 to entry: A DL-service user can be concurrently both a sending and receiving DLS-user.
3.3.17
sending DLS-user
DL-service user that acts as a source of DLS-user-data
3.3.18
service-node-address
address reserved for service purposes only
Note 1 to entry: All DLEs on a link receive all DLPDUs where the first Node-address is equal to the service-node-
address. Such DLPDUs can be Confirmed or Unconfirmed, and it is possible that their receipt can be acknowledged,
or not. The service-node-address can be used on links with only two DLEs – the requesting Normal class DLE and
the responding simple-class or normal-class DLE. The value of the service-node-address is 127.
3.3.19
simple-class device
device which replies to requests from normal class devices
Note 1 to entry: Such a device can act as a server or responder only.
3.3.20
source-DL-route
holds a sequence of DL-route-elemen
...
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