IEC 61158-3-4:2019

Industrial communication networks - Fieldbus specifications - Part 3-4: Data-link layer service definition - Type 4 elements

IEC 61158-3-4:2019 defines 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 and systems management at the boundary between the data-link layer and systems management of the fieldbus reference model. This third edition cancels and replaces the second edition published in 2014. It constitutes a technical revision. The main changes are:
-Additional user parameters to services;
-Additional services to support distributed objects;
-Additional secure services

Réseaux de communication industriels - Spécifications des bus de terrain - Partie 3-4: Définition des services de couche liaison de données - Elements de type 4

L’IEC 61158-3-4:2019 fournit les éléments communs des communications de messagerie critiques du point de vue temporel entre dispositifs dans un environnement automatisé. Le terme "en temps critique" signale l'existence d'une fenêtre temporelle dans laquelle des actions spécifiées doivent être exécutées, avec un niveau de certitude défini. La non-réalisation des actions spécifiées dans la fenêtre temporelle induit un risque de défaillance des applications qui demandent ces actions, avec les risques afférents pour l'équipement, les installations et éventuellement la vie humaine.
La présente norme définit de manière abstraite les services visibles de l'extérieur fournis par la couche liaison de données de réseau de terrain de type 4 en termes
a) des actions et événements primitifs des services;
b) de paramètres associés à chaque événement et action de primitive, ainsi que de forme prise par ces paramètres; et
c) d'interaction entre ces événements et ces actions, ainsi que de séquences valides desdits événements et actions.

General Information

• Status: Published
• Publication Date: 23-Apr-2019
• ICS: 25.040.40 - Industrial process measurement and control
• ICS: 35.100.20 - Data link layer
• ICS: 35.110 - Networking
• Technical Committee: SC 65C - Industrial networks
• Drafting Committee: WG 9 - TC 65/SC 65C/WG 9
• Current Stage: DELPUB - Deleted Publication
• Completion Date: 16-Mar-2023

Relations

• Revised: IEC 61158-3-4:2023 - Industrial communication networks - Fieldbus specifications - Part 3-4: Data-link layer service definition - Type 4 elements
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 61158-3-4
®

Edition 3.0 2019-04
INTERNATIONAL
STANDARD



Industrial communication networks – Fieldbus specifications –
Part 3-4: Data-link layer service definition – Type 4 elements

IEC 61158-3-4:2019-04(en)

---------------------- Page: 1 ----------------------
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IEC 61158-3-4

®


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INTERNATIONAL



STANDARD



















Industrial communication networks – Fieldbus specifications –

Part 3-4: Data-link layer service definition – Type 4 elements



























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– 2 – IEC 61158-3-4:2019 © IEC 2019
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, abbreviations 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 . 20
5.1 Scope and inheritance . 20
5.2 Facilities of the DL-management service . 20
5.3 Model of the DL-management service . 21
5.4 Constraints on sequence of primitives . 21
5.5 Set . 21
5.5.1 Function . 21
5.5.2 Types of parameters . 22
5.6 Get . 22
5.6.1 Function . 22
5.6.2 Types of parameters . 22
5.7 Action . 23
5.7.1 Function . 23
5.7.2 Types of parameters . 23
5.7.3 Sequence of primitives . 24

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IEC 61158-3-4:2019 © IEC 2019 – 3 –
5.8 Event . 24
5.8.1 Function . 24
5.8.2 Types of parameters . 24
Bibliography . 25

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 . 21
Table 5 – DLM-Set primitive and parameters . 22
Table 6 – DLM-Get primitive and parameters . 22
Table 7 – DLM-Action primitive and parameters . 23
Table 8 – DLM-Event primitive and parameters . 24

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INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

INDUSTRIAL COMMUNICATION NETWORKS –
FIELDBUS SPECIFICATIONS –

Part 3-4: Data-link 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
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5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
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6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
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other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
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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 IEC 61784-1 and IEC 61784-2.
International Standard IEC 61158-3-4 has been prepared by subcommittee 65C: Industrial
networks, of IEC technical committee 65: Industrial-process measurement, control and
automation.
This third edition cancels and replaces the second edition published in 2014. This edition
constitutes a technical revision.

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IEC 61158-3-4:2019 © IEC 2019 – 5 –
This edition includes the following significant technical changes with respect to the previous
edition:
a) additional user parameters to services;
b) additional services to support distributed objects;
c) additional secure services;
The text of this International Standard is based on the following documents:
FDIS Report on voting
65C/945/FDIS 65C/954/RVD

Full information on the voting for the approval of this International Standard can be found in
the report on voting indicated in the above table.
This publication has been drafted in accordance with ISO/IEC Directives, Part 2.
A list of all the parts of the IEC 61158 series, published under the general title Industrial
communication networks – Fieldbus specifications can be found on the IEC website.
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
A bilingual version of this publication may be issued at a later date.

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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.

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IEC 61158-3-4:2019 © IEC 2019 – 7 –
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 International Standard 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 specification may 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 1 data-link layer services defined in this document.

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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 IEC 61784-1 and IEC 61784-2 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, abbreviations and conventions
For the purposes of this document, the following terms, definitions, symbols, abbreviations
and conventions apply.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://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 DL-connection [7498-1]
3.1.7 DL-connection-end-point [7498-1]
3.1.8 DL-connection-end-point-identifier [7498-1]
3.1.9 DL-connection-mode transmission [7498-1]
3.1.10 DL-connectionless-mode transmission [7498-1]
3.1.11 correspondent (N)-entities [7498-1]
  correspondent DL-entities  (N=2)
  correspondent Ph-entities  (N=1)
3.1.12 DL-duplex-transmission [7498-1]

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IEC 61158-3-4:2019 © IEC 2019 – 9 –
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:

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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

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IEC 61158-3-4:2019 © IEC 2019 – 11 –
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 may 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

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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 their receipt may or may not be acknowledged. 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-elements, describing the complete route back to the source
3.4 Symbols and abbreviations
NOTE Many symbols and abbreviations are common to more than one protocol Type; they are not necessarily
used by all protocol Types.
DL- Data-link layer (as a prefix)
DLC DL-connection
DLCEP DL-connection-end-point
DLE DL-entity (the local active instance of the data-link layer)
DLL DL-layer
DLPCI DL-protocol-control-information
DLPDU DL-protocol-data-unit
DLM DL-management
DLME DL-management Entity (the local active instance of DL-management)
DLMS DL-management Service
DLS DL-service
DLSAP DL-service-access-point
DLSDU DL-service-data-unit
FIFO First-in first-out (queuing method)
OSI Open systems interconnection
Ph- Physical layer (as a prefix)
PhE Ph-entity (the local active instance of the physical layer)

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IEC 61158-3-4:2019 © IEC 2019 – 13 –
PhL Ph-layer
QoS Quality of service

3.5 Conventions
This document uses the descriptive conventions given in ISO/IEC 10731.
The service model, service primitives, and time-sequence diagrams used are entirely abstract
descriptions; they do not represent a specification for implementation.
Service primitives, used to represent service user/service provider interactions (see
ISO/IEC 10731), convey parameters that indicate information available in the user/provider
interaction.
This document uses a tabular format to describe the component parameters of the DLS
primitives. The parameter
...

IEC 61158-3-4
®

Edition 3.0 2019-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE


Industrial communication networks – Fieldbus specifications –
Part 3-4: Data-link layer service definition – Type 4 elements

Réseaux de communication industriels – Spécifications des bus de terrain –
Partie 3-4: Définition des services de couche liaison de données – Éléments
de type 4

IEC 61158-3-4:2019-04(en-fr)

---------------------- Page: 1 ----------------------
THIS PUBLICATION IS COPYRIGHT PROTECTED
Copyright © 2019 IEC, Geneva, Switzerland

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
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The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.

About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigendum or an amendment might have been published.

IEC publications search - webstore.iec.ch/advsearchform Electropedia - www.electropedia.org
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IEC 61158-3-4

®


Edition 3.0 2019-04




INTERNATIONAL



STANDARD




NORME


INTERNATIONALE











Industrial communication networks – Fieldbus specifications –

Part 3-4: Data-link layer service definition – Type 4 elements



Réseaux de communication industriels – Spécifications des bus de terrain –

Partie 3-4: Définition des services de couche liaison de données – Éléments

de type 4















INTERNATIONAL

ELECTROTECHNICAL

COMMISSION


COMMISSION

ELECTROTECHNIQUE


INTERNATIONALE




ICS 25.040.40; 35.100.20; 35.110 ISBN 978-2-8322-9110-8




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

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

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

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– 2 – IEC 61158-3-4:2019 © IEC 2019
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, abbreviations and conventions . 8
3.1 Reference model terms and definitions . 8
3.2 Service convention terms and definitions . 10
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 . 16
4.5 Model of the connectionless-mode data-link service . 16
4.5.1 General . 16
4.5.2 Unconfirmed request . 16
4.5.3 Confirmed request . 16
4.6 Sequence of primitives . 17
4.6.1 Constraints on sequence of primitives . 17
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 . 23
5.7.3 Sequence of primitives . 24

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IEC 61158-3-4:2019 © IEC 2019 – 3 –
5.8 Event . 24
5.8.1 Function . 24
5.8.2 Types of parameters . 24
Bibliography . 26

Figure 1 – Relationship of PhE, DLE and DLS-users . 15
Figure 2 – Confirmed and unconfirmed UNITDATA request time-sequence diagram . 17
Figure 3 – Repeated confirmed request time-sequence diagram . 18
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 . 19
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

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– 4 – IEC 61158-3-4:2019 © IEC 2019
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

INDUSTRIAL COMMUNICATION NETWORKS –
FIELDBUS SPECIFICATIONS –

Part 3-4: Data-link 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 and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
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4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
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 IEC 61784-1 and IEC 61784-2.
International Standard IEC 61158-3-4 has been prepared by subcommittee 65C: Industrial
networks, of IEC technical committee 65: Industrial-process measurement, control and
automation.
This third edition cancels and replaces the second edition published in 2014. This edition
constitutes a technical revision.

---------------------- Page: 6 ----------------------
IEC 61158-3-4:2019 © IEC 2019 – 5 –
This edition includes the following significant technical changes with respect to the previous
edition:
a) additional user parameters to services;
b) additional services to support distributed objects;
c) additional secure services;
The text of this International Standard is based on the following documents:
FDIS Report on voting
65C/945/FDIS 65C/954/RVD

Full information on the voting for the approval of this International Standard can be found in
the report on voting indicated in the above table.
This publication has been drafted in accordance with ISO/IEC Directives, Part 2.
A list of all the parts of the IEC 61158 series, published under the general title Industrial
communication networks – Fieldbus specifications can be found on the IEC website.
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.

---------------------- Page: 7 ----------------------
– 6 – IEC 61158-3-4:2019 © IEC 2019
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.

---------------------- Page: 8 ----------------------
IEC 61158-3-4:2019 © IEC 2019 – 7 –
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 International Standard 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 specification may 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 1 data-link layer services defined in this document.

---------------------- Page: 9 ----------------------
– 8 – IEC 61158-3-4:2019 © IEC 2019
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 IEC 61784-1 and IEC 61784-2 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, abbreviations and conventions
For the purposes of this document, the following terms, definitions, symbols, abbreviations
and conventions apply.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://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.

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IEC 61158-3-4:2019 © IEC 2019 – 9 –
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 DL-connection
[7498-1]
3.1.7 DL-connection-end-point [7498-1]
3.1.8 DL-connection-end-point-identifier
[7498-1]
3.1.9 DL-connection-mode transmission [7498-1]
3.1.10 DL-connectionless-mode transmission
[7498-1]
3.1.11 correspondent (N)-entities [7498-1]
  correspondent DL-entities  (N=2)
  correspondent Ph-entities  (N=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]

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– 10 – IEC 61158-3-4:2019 © IEC 2019
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:
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.

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IEC 61158-3-4:2019 © IEC 2019 – 11 –
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 may be
performed, as a result of Wait acknowledges from the remote DLE or DLS-user

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– 12 – IEC 61158-3-4:2019 © IEC 2019
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
...