IEC TR 61491:2010

IEC/TR 61491 ®
Edition 1.0 2010-01
TECHNICAL
REPORT
RAPPORT
TECHNIQUE
Electrical equipment of industrial machines – Serial data link for real-time
communication between controls and drives
Équipement électrique des machines industrielles – Liaison des données
sérielles pour communications en temps réel entre unités de commande et
dispositifs d’entraînement
IEC/TR 61491:2010
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IEC/TR 61491 ®
Edition 1.0 2010-01
TECHNICAL
REPORT
RAPPORT
TECHNIQUE
Electrical equipment of industrial machines – Serial data link for real-time
communication between controls and drives

Équipement électrique des machines industrielles – Liaison des données
sérielles pour communications en temps réel entre unités de commande et
dispositifs d’entraînement
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.200; 35.240.50 ISBN 2-8318-1075-6
– 2 – TR 61491  IEC:2010
CONTENTS
FOREWORD .3

INTRODUCTION .5

1 Scope .6

2 Normative references .6

3 Terms, definitions, symbols and abbreviated terms .7

3.1 Terms and definitions .7

3.2 Symbols and abbreviated terms .7

4 Structure of the communication specification .7
5 Structure of the application specification .8
Bibliography .9

Table 1 – Overview on communication profiles of CPF 16 .8

TR 61491  IEC:2010 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION

____________
ELECTRICAL EQUIPMENT OF INDUSTRIAL MACHINES –

SERIAL DATA LINK FOR REAL-TIME COMMUNICATION

BETWEEN CONTROLS AND DRIVES
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
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2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
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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.
The main task of IEC technical committees is to prepare International Standards. However, a

technical committee may propose the publication of a technical report when it has collected
data of a different kind from that which is normally published as an International Standard, for
example "state of the art".
IEC 61491, which is a technical report, has been prepared by subcommittee 22G: Adjustable
speed electric drive systems incorporating semiconductor power converters, of IEC technical
committee 22: Power electronic systems and equipment.
This first edition of the technical report cancels and replaces the second edition of IEC 61491,
published in 2002. The changes are primarily to make reference to material that was moved to
IEC 61158, IEC 61784 and IEC 61800-7 series of standards.

– 4 – TR 61491  IEC:2010
The text of this technical report is based on the following documents:

Enquiry draft Report on voting

22G/199/DTR 22G/209/RVC
Full information on the voting for the approval of this technical report can be found in the

report on voting indicated in the above table.

This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

The committee has decided that the contents of this publication will remain unchanged until
the maintenance result 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.
TR 61491  IEC:2010 – 5 –
INTRODUCTION
This technical report replaces the second edition of IEC 61491:2002 which has been

separated into:
a) communication parts, included in the IEC 61158 and IEC 61784 series (prepared by

subcommittee 65C: Industrial networks, of IEC technical committee 65: Industrial process

measurement, control and automation);

b) the application part, included in the IEC 61800-7 series (prepared by subcommittee 22G:

Adjustable speed electric drive systems incorporating semiconductor power converters, of

IEC technical committee 22: Power electronic systems and equipment.)

The communication related content of the second edition of IEC 61491:2002 and technical
updates are specified by communication profile family 16 (CPF 16) in IEC 61784-1 and
IEC 61784-2. The application related content of the second edition of IEC 61491:2002 (drive
profile) and technical updates are specified in IEC 61800-7.

– 6 – TR 61491  IEC:2010
ELECTRICAL EQUIPMENT OF INDUSTRIAL MACHINES –

SERIAL DATA LINK FOR REAL-TIME COMMUNICATION

BETWEEN CONTROLS AND DRIVES
1 Scope
This technical report presents an overview and guidance for IEC 61158, IEC 61784-1,

IEC 61784-2 and IEC 61800-7 with respect to a real-time serial interface between the control
unit and its associated devices, which is utilized to transmit periodic and non periodic data.
This interface is intended to apply to industrial machines, such as machine tools, with multiple
devices connected via this interface. This interface supports different operation modes.
2 Normative references
The following referenced documents are indispensable for the application 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.
IEC 61158 (all parts), Industrial communication networks – Fieldbus specifications
IEC 61158-1, Industrial communication networks – Fieldbus specifications – Part 1: Overview
and guidance for the IEC 61158 and IEC 61784 series
IEC 61158-2, Industrial communication networks – Fieldbus specifications – Part 2: Physical
layer specification and service definition
IEC 61158-3-16, Industrial communication networks – Fieldbus specifications – Part 3-16:
Data-link layer service definition – Type 16 elements
IEC 61158-3-19, Industrial communication networks – Fieldbus specifications – Part 3-19:
Data-link layer service definition – Type 19 elements
IEC 61158-4-16, Industrial communication networks – Fieldbus specifications – Part 4-16:
Data-link layer protocol specification – Type 16 elements

IEC 61158-4-19, Industrial communication networks – Fieldbus specifications – Part 4-19:
Data-link layer protocol specification – Type 19 elements
IEC 61158-5-16, Industrial communication networks – Fieldbus specifications – Part 5-16:
Application layer service definition – Type 16 elements
IEC 61158-5-19, Industrial communication networks – Fieldbus specifications – Part 5-19:
Application layer service definition – Type 19 elements
IEC 61158-6-16, Industrial communication networks – Fieldbus specifications – Part 6-16:
Application layer protocol specification – Type 16 elements
IEC 61158-6-19, Industrial communication networks – Fieldbus specifications – Part 6-19:
Application layer protocol specification – Type 19 elements
IEC 61784-1, Industrial communication networks – Profiles – Part 1: Fieldbus profiles

TR 61491  IEC:2010 – 7 –
IEC 61784-2, Industrial communication networks – Profiles – Part 2: Additional fieldbus

profiles for real-time networks based on ISO/IEC 8802-3

IEC 61800-7 (all subparts) Adjustable speed electrical power drive systems – Part 7-xxx:

Generic interface and use of profiles for power drive systems

IEC 61800-7-1, Adjustable speed electrical power drive systems – Part 7-1: Generic interface

and use of profiles for power drive systems – Interface definition

IEC 61800-7-204, Adjustable speed electrical power drive systems – Part 7-204: Generic

interface and use of profiles for power drive systems – Profile type 4 specification

IEC 61800-7-304, Adjustable speed electrical power drives systems – Part 7-304: Generic
interface and use of profiles for power drive systems – Mapping of profile type 4 to network
technologies
ISO/IEC 8802-3, Information technology – Telecommunications and information exchange
between systems – Local and metropolitan area networks – Specific requirements – Part 3:
Carrier sense multiple access with collision detection (CSMA/CD) access method and
physical layer specifications
3 Terms, definitions, symbols and abbreviated terms
3.1 Terms and definitions
For the purposes of this document, the terms and definitions given in the referenced
specifications apply.
3.2 Symbols and abbreviated terms
The following abbreviations apply for this document.
CP Communication profile
CPF Communication profile family
PDS Power drive system
4 Structure of the communication specification

The communication related specification is divided into three communication profiles:
• communication profile 16/1 (CP 16/1) in IEC 61784-1 covers the communication related
content of the second edition of IEC 61491:2002;
• communication profile 16/2 (CP 16/2) in IEC 61784-1 covers CP 16/1 and the increased
bit rates (8 Mbit/s and 16 Mbit/s);
• communication profile 16/3 (CP 16/3) in IEC 61784-2 covers an extended functionality of
CP 16/2 based on ISO/IEC 8802-3.
CP 16/1 and CP 16/2 correspond to Type 16 of the IEC 61158 series. CP 16/3 corresponds to
Type 19 of the IEC 61158 series. The relations are shown in Table 1.
The general structure of the IEC 61158 series is explained in IEC 61158-1.

– 8 – TR 61491  IEC:2010
Table 1 – Overview on communication profiles of CPF 16

CP CPF Type Physical layer Data link layer Application layer

16/1 16 16 IEC 61158-2 IEC 61158-3-16 IEC 61158-5-16

IEC 61158-4-16 IEC 611
...