IEC 61158-3-19:2019

Industrial communication networks - Fieldbus specifications - Part 3-19: Data-link layer service definition - Type 19 elements

IEC 61158-3-19:2019 defines the services provided to the Type 19 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 fourth edition cancels and replaces the third edition published in 2014. It constitutes a technical revision. The main changes are:
-improving the hotplug and redundancy features;
-improving the phase switching and the error handling;
-editorial improvements

Réseaux de communication industriels - Spécifications des bus de terrain - Partie 3-19: Définition des services de couche liaison de données - Éléments de type 19

L’IEC 61158-3-19:2019 fournit les éléments communs des communications de messagerie critiques du point de vue temporel entre appareils dans un environnement automatisé. Le terme "prioritaire" sert à représenter la présence d'une fenêtre temporelle, dans les limites de laquelle une ou plusieurs actions spécifiées sont tenues d'être parachevées avec un certain niveau défini de certitude. Le manquement à parachever les actions spécifiées dans les limites de la fenêtre temporelle risque d'entraîner la défaillance des applications qui demandent ces actions, avec le risque concomitant pour l'équipement, l'installation et éventuellement pour la vie humaine.
La présente norme définit de manière abstraite le service visible de l'extérieur fourni par la couche liaison de données de bus de terrain de type 19 en termes
a) des actions et événements primitifs du service;
b) des paramètres associés à chaque action primitive et événement primitif, et la forme qu'ils prennent; et
c) de l'interrelation entre ces actions et événements, et leurs séquences valides.

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: PPUB - Publication issued
• Start Date: 26-Apr-2019
• Completion Date: 24-Apr-2019

Standards Content (Sample)

IEC 61158-3-19
®

Edition 4.0 2019-04
INTERNATIONAL
STANDARD



Industrial communication networks – Fieldbus specifications –
Part 3-19: Data-link layer service definition – Type 19 elements

IEC 61158-3-19:2019-04(en)

---------------------- Page: 1 ----------------------
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IEC 61158-3-19

®


Edition 4.0 2019-04




INTERNATIONAL



STANDARD



















Industrial communication networks – Fieldbus specifications –

Part 3-19: Data-link layer service definition – Type 19 elements



























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– 2 – IEC 61158-3-19:2019 © 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 . 13
3.5 Common conventions . 13
4 Data-link services and concepts . 15
4.1 Overview. 15
4.1.1 General . 15
4.1.2 Acknowledged connection oriented data transfer: Read (RD) . 16
4.1.3 Acknowledged connection oriented data transfer: Read (WR) . 16
4.1.4 Acknowledged connection oriented data transfer:
Initiate_cyclic_communication (ICC) . 17
4.1.5 Acknowledged connection oriented data transfer:
Disable_cyclic_communication (DCC) . 17
4.1.6 Unacknowledged connectionless data transfer: Write_cyclic (WRC) . 17
4.1.7 Unacknowledged connectionless data transfer: Send_Device_Status
(SDS) . 17
4.1.8 Unacknowledged connectionless data transfer: Write_Device_Status
(WDS) . 17
4.2 Service channel services (SVC services) . 17
4.2.1 General . 17
4.2.2 Read (RD) . 17
4.2.3 Write (WR). 18
4.3 Hot-plug services . 19
4.3.1 Enable_Hotplug (EHP) . 19
4.3.2 Notify_Hotplug (NHP) . 20
4.4 Realtime channel setup services (RTCS services) . 20
4.4.1 General . 20
4.4.2 Initiate_cyclic_communication (ICC) . 20
4.4.3 Disable_cyclic_communication (DCC) . 21
4.5 RTC services . 22
4.5.1 General . 22
4.5.2 Notify_Error (NER) . 22
4.5.3 Write_cyclic (WRC) . 22
4.5.4 Send_Device_Status (SDS) . 23
4.5.5 Write_Device_Status (WDS) . 24
4.5.6 Notify_Network_Status_Change (NNSC) . 24
Bibliography . 25

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IEC 61158-3-19:2019 © IEC 2019 – 3 –
Figure 1 – Relationships of DLSAPs, DLSAP-addresses and group DL-addresses . 15

Table 1 – Summary of DL services and primitives . 16
Table 2 – Read (RD) . 18
Table 3 – Write (WR) . 19
Table 4 – Enable_Hotplug (EHP) . 20
Table 5 – Notify_Hotplug (NHP) . 20
Table 6 – Initiate_cyclic_communication (ICC) . 21
Table 7 – Disable_cyclic_communication (DCC) . 22
Table 8 – Notify_Error (NER) . 22
Table 9 – Write_cyclic (WRC) . 23
Table 10 – Send_Device_Status (SDS) . 23
Table 11 – Write_Device_Status (WDS) . 24
Table 12 – Notify_Network_Status_Change (NNSC) . 24

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– 4 – IEC 61158-3-19:2019 © IEC 2019
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

INDUSTRIAL COMMUNICATION NETWORKS –
FIELDBUS SPECIFICATIONS –

Part 3-19: Data-link layer service definition –
Type 19 elements

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
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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 61158-3-19 has been prepared by subcommittee 65C: Industrial
networks, of IEC technical committee 65: Industrial-process measurement, control and
automation.
This fourth edition cancels and replaces the third edition published in 2014.This edition
constitutes a technical revision.

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IEC 61158-3-19:2019 © IEC 2019 – 5 –
This edition includes the following significant technical changes with respect to the previous
edition:
• improving the hotplug and redundancy features;
• improving the phase switching and the error handling;
• editorial improvements.
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 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 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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– 6 – IEC 61158-3-19:2019 © 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.

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IEC 61158-3-19:2019 © IEC 2019 – 7 –
INDUSTRIAL COMMUNICATION NETWORKS –
FIELDBUS SPECIFICATIONS –

Part 3-19: Data-link layer service definition –
Type 19 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 service provided
by the Type 19 fieldbus data-link layer in terms of
a) the primitive actions and events of the service;
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 19 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.
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 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, and
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 do they 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 fulfils the Type 19 data-link layer services defined in this document.

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– 8 – IEC 61158-3-19:2019 © 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, 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)

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IEC 61158-3-19:2019 © IEC 2019 – 9 –
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 peer-entities
[7498-1]
3.1.22 primitive name [7498-3]
3.1.23 DL-protocol [7498-1]
3.1.24 DL-protocol-connection-identifier [7498-1]
3.1.25 DL-protocol-data-unit
[7498-1]
3.1.26 DL-relay [7498-1]
3.1.27 reset
[7498-1]
3.1.28 responding-DL-address [7498-3]
3.1.29 routing
[7498-1]
3.1.30 segmenting [7498-1]
3.1.31 (N)-service
[7498-1]
 DL-service  (N=2)
 Ph-service  (N=1)
3.1.32 (N)-service-access-point [7498-1]
 DL-service-access-point  (N=2)
 Ph-service-access-point  (N=1)
3.1.33 DL-service-access-point-address
[7498-3]
3.1.34 DL-service-connection-identifier [7498-1]
3.1.35 DL-service-data-unit [7498-1]
3.1.36 DL-simplex-transmission [7498-1]
3.1.37 DL-subsystem
[7498-1]
3.1.38 systems-management [7498-1]
3.1.39 DL-user-data
[7498-1]

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– 10 – IEC 61158-3-19:2019 © IEC 2019
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 asymmetrical service
3.2.3 confirm (primitive);
 requestor.deliver (primitive)
3.2.4 deliver (primitive)
3.2.5 DL-confirmed-facility
3.2.6 DL-facility
3.2.7 DL-local-view
3.2.8 DL-mandatory-facility
3.2.9 DL-non-confirmed-facility
3.2.10 DL-provider-initiated-facility
3.2.11 DL-provider-optional-facility
3.2.12 DL-service-primitive;
 primitive
3.2.13 DL-service-provider
3.2.14 DL-service-user
3.2.15 DL-user-optional-facility
3.2.16 indication (primitive);
 acceptor.deliver (primitive)
3.2.17 multi-peer
3.2.18 request (primitive);
 requestor.submit (primitive)
3.2.19 requestor
3.2.20 response (primitive);
 acceptor.submit (primitive)
3.2.21 submit (primitive)
3.2.22 symmetrical service
3.3 Data-link service terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.3.1
communication cycle
fixed time period between two master synchronization telegrams in which real-time telegrams
are transmitted in the RT channel and non real-time telegrams are transmitted in the IP
channel

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IEC 61158-3-19:2019 © IEC 2019 – 11 –
3.3.2
cycle time
duration of a communication cycle
3.3.3
cyclic communication
periodic exchange of telegrams
3.3.4
cyclic data
part of a telegram, which does not change its meaning during cyclic operation of the network
3.3.5
device
a slave in the communication network, (e.g., a power drive system as defined in the
IEC 61800, I/O stations as defined in the IEC 61131)
3.3.6
device status
four adjacent octets inside the acknowledge telegram containing status information for each
device
3.3.7
DL-segment
link
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
3.3.8
DLSAP
distinctive point at which DL-services are provided by a single DL-entity to a single higher-
layer entity
Note 1 to entry: Definition derived from ISO/IEC 7498-1:1994, Clause 5.
3.3.9
DL(SAP)-address
either an individual DLSAP-address, designating a single DLSAP of a single DLS-user, or a
group DL-address potentially designating multiple DLSAPs, each of a single DLS-user
Note 1 to entry: This terminology is chosen because ISO/IEC 7498-3 does not permit the use of the term DLSAP-
address to designate more than a single DLSAP at a single DLS-user.
3.3.10
(individual) DLSAP-address
DL-address that designates only one DLSAP within the extended link
Note 1 to entry: A single DL-entity may have multiple DLSAP-addresses associated with a single DLSAP.
3.3.11
element
part of IDNs – each IDN has 7 elements, whereas each one has a specific meaning (e.g.,
number, name, data)

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– 12 – IEC 61158-3-19:2019 © IEC 2019
3.3.12
extended link
DL-subnetwork, consisting of the maximal set of links interconnected by DL-relays, sharing a
single DL-name (DL-address) space, in which any of the connected DL-entities may
communicate, one with another, either directly or with the assistance of one or more of those
intervening DL-relay entities
Note 1 to entry: An extended link may be composed of just a single link.
3.3.13
frame
denigrated synonym for DLPDU
3.3.14
group DL-address
DL-address that potentially designates more than one DLSAP within the extended link
Note 1 to entry: A single DL-entity may have multiple group DL-addresses associated with a single DLSAP. A
single DL-entity also may have a single group DL-address associated with more than one DLSAP.
3.3.15
identification number
IDN
designation of operating data under which a data block is preserved with its attribute, name,
unit, minimum and maximum input values, and the data
3.3.16
master
node, which assigns the other nodes (i.e., slaves) the right to transmit
3.3.17
node
single DL-entity as it appears on one local link
3.3.18
protocol
convention about the data formats, time sequences, and error correction in the data exchange
of communication systems
3.3.19
receiving DLS-user
DL-service user that acts as a recipient of DL-user-data
Note 1 to entry: A DL-service user can be concurrently both a sending and receiving DLS-user.
3.3.20
sending DLS-user
DL-service user that acts as a source of DL-user-data
3.3.21
service channel
SVC
non-real-time transmission of information upon master request during RT channel
3.3.22
slave
node, which is assigned the right to transmit by the master

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IEC 61158-3-19:2019 © IEC 2019 – 13 –
3.3.23
topology
physical network architecture with respect to the connection between the stations of the
communication system
3.4 Symbols and abbreviations
AT Acknowledge telegram
CA Procedure command acknowledgment
CC Cross communication between participants
DA Destination address
DAT Duration of acknowledge telegram
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)
HS service channel handshake (see AHS and MHS)
IDN Identification number
INFO service channel information
MC motion control or motion controller (see also NC)
NC numerical control (also control unit or controller)
OSI Open systems interconnection
Ph- Physical layer (as a prefix)
PhE Ph-entity (the local active instance of the physical layer)
PhL Ph-layer
QoS Quality of service
RE Resource element
RT real-time
RTC real-time channel
SA source address
SI Sub Index
SVC Service Channel
XX address of a device

3.5 Common conventions
This document uses the descriptive conventions given in ISO/IEC 10731.

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– 14 – IEC 61158-3-19:2019 © IEC 2019
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
pr
...

IEC 61158-3-19
®

Edition 4.0 2019-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE


Industrial communication networks – Fieldbus specifications –
Part 3-19: Data-link layer service definition – Type 19 elements

Réseaux de communication industriels – Spécifications des bus de terrain –
Partie 3-19: Définition des services de couche liaison de données – Éléments
de type 19

IEC 61158-3-19:2019-04(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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---------------------- Page: 2 ----------------------
IEC 61158-3-19

®


Edition 4.0 2019-04




INTERNATIONAL



STANDARD




NORME


INTERNATIONALE











Industrial communication networks – Fieldbus specifications –

Part 3-19: Data-link layer service definition – Type 19 elements



Réseaux de communication industriels – Spécifications des bus de terrain –

Partie 3-19: Définition des services de couche liaison de données – Éléments

de type 19















INTERNATIONAL

ELECTROTECHNICAL

COMMISSION


COMMISSION

ELECTROTECHNIQUE


INTERNATIONALE




ICS 25.040.40; 35.100.20; 35.110 ISBN 978-2-8322-9113-9




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

---------------------- Page: 3 ----------------------
– 2 – IEC 61158-3-19:2019 © 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 . 11
3.4 Symbols and abbreviations . 13
3.5 Common conventions . 14
4 Data-link services and concepts . 16
4.1 Overview. 16
4.1.1 General . 16
4.1.2 Acknowledged connection oriented data transfer: Read (RD) . 17
4.1.3 Acknowledged connection oriented data transfer: Read (WR) . 17
4.1.4 Acknowledged connection oriented data transfer:
Initiate_cyclic_communication (ICC) . 18
4.1.5 Acknowledged connection oriented data transfer:
Disable_cyclic_communication (DCC) . 18
4.1.6 Unacknowledged connectionless data transfer: Write_cyclic (WRC) . 18
4.1.7 Unacknowledged connectionless data transfer: Send_Device_Status
(SDS) . 18
4.1.8 Unacknowledged connectionless data transfer: Write_Device_Status
(WDS) . 18
4.2 Service channel services (SVC services) . 18
4.2.1 General . 18
4.2.2 Read (RD) . 18
4.2.3 Write (WR). 19
4.3 Hot-plug services . 20
4.3.1 Enable_Hotplug (EHP) . 20
4.3.2 Notify_Hotplug (NHP) . 21
4.4 Realtime channel setup services (RTCS services) . 21
4.4.1 General . 21
4.4.2 Initiate_cyclic_communication (ICC) . 21
4.4.3 Disable_cyclic_communication (DCC) . 22
4.5 RTC services . 23
4.5.1 General . 23
4.5.2 Notify_Error (NER) . 23
4.5.3 Write_cyclic (WRC) . 23
4.5.4 Send_Device_Status (SDS) . 24
4.5.5 Write_Device_Status (WDS) . 25
4.5.6 Notify_Network_Status_Change (NNSC) . 25
Bibliography . 26

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IEC 61158-3-19:2019 © IEC 2019 – 3 –
Figure 1 – Relationships of DLSAPs, DLSAP-addresses and group DL-addresses . 16

Table 1 – Summary of DL services and primitives . 17
Table 2 – Read (RD) . 19
Table 3 – Write (WR) . 20
Table 4 – Enable_Hotplug (EHP) . 21
Table 5 – Notify_Hotplug (NHP) . 21
Table 6 – Initiate_cyclic_communication (ICC) . 22
Table 7 – Disable_cyclic_communication (DCC) . 23
Table 8 – Notify_Error (NER) . 23
Table 9 – Write_cyclic (WRC) . 24
Table 10 – Send_Device_Status (SDS) . 24
Table 11 – Write_Device_Status (WDS) . 25
Table 12 – Notify_Network_Status_Change (NNSC) . 25

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– 4 – IEC 61158-3-19:2019 © IEC 2019
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

INDUSTRIAL COMMUNICATION NETWORKS –
FIELDBUS SPECIFICATIONS –

Part 3-19: Data-link layer service definition –
Type 19 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
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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
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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
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between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
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5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
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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
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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 61158-3-19 has been prepared by subcommittee 65C: Industrial
networks, of IEC technical committee 65: Industrial-process measurement, control and
automation.
This fourth edition cancels and replaces the third edition published in 2014.This edition
constitutes a technical revision.

---------------------- Page: 6 ----------------------
IEC 61158-3-19:2019 © IEC 2019 – 5 –
This edition includes the following significant technical changes with respect to the previous
edition:
• improving the hotplug and redundancy features;
• improving the phase switching and the error handling;
• editorial improvements.
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 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 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 61158-3-19:2019 © 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 61158-3-19:2019 © IEC 2019 – 7 –
INDUSTRIAL COMMUNICATION NETWORKS –
FIELDBUS SPECIFICATIONS –

Part 3-19: Data-link layer service definition –
Type 19 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 service provided
by the Type 19 fieldbus data-link layer in terms of
a) the primitive actions and events of the service;
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 19 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.
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 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, and
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 do they 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 fulfils the Type 19 data-link layer services defined in this document.

---------------------- Page: 9 ----------------------
– 8 – IEC 61158-3-19:2019 © 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, 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 61158-3-19:2019 © 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 peer-entities [7498-1]
3.1.22 primitive name
[7498-3]
3.1.23 DL-protocol [7498-1]
3.1.24 DL-protocol-connection-identifier [7498-1]
3.1.25 DL-protocol-data-unit [7498-1]
3.1.26 DL-relay
[7498-1]
3.1.27 reset [7498-1]
3.1.28 responding-DL-address
[7498-3]
3.1.29 routing [7498-1]
3.1.30 segmenting
[7498-1]

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– 10 – IEC 61158-3-19:2019 © IEC 2019
3.1.31 (N)-service [7498-1]
 DL-service  (N=2)
 Ph-service  (N=1)
3.1.32 (N)-service-access-point
[7498-1]
 DL-service-access-point  (N=2)
 Ph-service-access-point  (N=1)
3.1.33 DL-service-access-point-address [7498-3]
3.1.34 DL-service-connection-identifier
[7498-1]
3.1.35 DL-service-data-unit [7498-1]
3.1.36 DL-simplex-transmission
[7498-1]
3.1.37 DL-subsystem [7498-1]
3.1.38 systems-management
[7498-1]
3.1.39 DL-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:

---------------------- Page: 12 ----------------------
IEC 61158-3-19:2019 © IEC 2019 – 11 –
3.2.1 acceptor
3.2.2 asymmetrical service
3.2.3 confirm (primitive);
 requestor.deliver (primitive)
3.2.4 deliver (primitive)
3.2.5 DL-confirmed-facility
3.2.6 DL-facility
3.2.7 DL-local-view
3.2.8 DL-mandatory-facility
3.2.9 DL-non-confirmed-facility
3.2.10 DL-provider-initiated-facility
3.2.11 DL-provider-optional-facility
3.2.12 DL-service-primitive;
 primitive
3.2.13 DL-service-provider
3.2.14 DL-service-user
3.2.15 DL-user-optional-facility
3.2.16 indication (primitive);
 acceptor.deliver (primitive)
3.2.17 multi-peer
3.2.18 request (primitive);
 requestor.submit (primitive)
3.2.19 requestor
3.2.20 response (primitive);
 acceptor.submit (primitive)
3.2.21 submit (primitive)
3.2.22 symmetrical service
3.3 Data-link service terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.3.1
communication cycle
fixed time period between two master synchronization telegrams in which real-time telegrams
are transmitted in the RT channel and non real-time telegrams are transmitted in the IP
channel
3.3.2
cycle time
duration of a communication cycle
3.3.3
cyclic communication
periodic exchange of telegrams
3.3.4
cyclic data
part of a telegram, which does not change its meaning during cyclic operation of the network

---------------------- Page: 13 ----------------------
– 12 – IEC 61158-3-19:2019 © IEC 2019
3.3.5
device
a slave in the communication network, (e.g., a power drive system as defined in the
IEC 61800, I/O stations as defined in the IEC 61131)
3.3.6
device status
four adjacent octets inside the acknowledge telegram containing status information for each
device
3.3.7
DL-segment
link
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
3.3.8
DLSAP
distinctive point at which DL-services are provided by a single DL-entity to a single higher-
layer entity
Note 1 to entry: Definition derived from ISO/IEC 7498-1:1994, Clause 5.
3.3.9
DL(SAP)-address
either an individual DLSAP-address, designating a single DLSAP of a single DLS-user, or a
group DL-address potentially designating multiple DLSAPs, each of a single DLS-user
Note 1 to entry: This terminology is chosen because ISO/IEC 7498-3 does not permit the use of the term DLSAP-
address to designate more than a single DLSAP at a single DLS-user.
3.3.10
(individual) DLSAP-address
DL-address that designates only one DLSAP within the extended link
Note 1 to entry: A single DL-entity may have multiple DLSAP-addresses associated with a single DLSAP.
3.3.11
element
part of IDNs – each IDN has 7 elements, whereas each one has a specific meaning (e.g.,
number, name, data)
3.3.12
extended link
DL-subnetwork, consisting of the maximal set of links interconnected by DL-relays, sharing a
single DL-name (DL-address) space, in which any of the connected DL-entities may
communicate, one with another, either directly or with the assistance of one or more of those
intervening DL-relay entities
Note 1 to entry: An extended link may be composed of just a single link.
3.3.13
frame
denigrated synonym for DLPDU

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IEC 61158-3-19:2019 © IEC 2019 – 13 –
3.3.14
group DL-address
DL-address that potentially designates more than one DLSAP within the extended link
Note 1 to entry: A single DL-entity may have multiple group DL-addresses associated with a single DLSAP. A
single DL-entity also may have a single group DL-address associated with more than one DLSAP.
3.3.15
identificatio
...