IEC 62026-1:2019

Low-voltage switchgear and controlgear - Controller-device interfaces (CDIs) - Part 1: General rules

IEC 62026-1:2019 applies to interfaces between low-voltage switchgear, controlgear, and controllers (e.g. programmable controllers, personal computers, etc.). This document does not apply to higher level industrial communication networks that have become known as fieldbuses and are considered by IEC subcommittee 65C. This third edition cancels and replaces the second edition published in 2007. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
a) additional requirements for safety information and instructions, including the measures to be taken, if any, for achieving EMC compliance;
b) EMC immunity requirements aligned with current IEC 61000-6 series of standards. Radiated radio-frequency electromagnetic fields test level increased to 6 GHz;
c) EMC emissions requirements aligned with current CISPR 11 publication.

Appareillage à basse tension - Interfaces appareil de commande-appareil (CDI) - Partie 1: Règles générales

L'IEC 62026-1:2019 s’applique aux interfaces entre l’appareillage à basse tension et des appareils de commande (par exemple automates programmables, ordinateurs personnels, etc.). Le présent document ne s’applique pas aux réseaux de communication industriels de plus haut niveau connus sous le nom de bus de terrain et qui relèvent du sous-comité 65C de l’IEC. Cette troisième édition annule et remplace la deuxième édition parue en 2007. Cette édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
a) exigences supplémentaires pour les informations et les instructions relatives à la sécurité, notamment les mesures à prendre, s’il y a lieu, pour parvenir à la conformité CEM;
b) alignement des exigences CEM concernant l’immunité sur celles de la série de normes IEC 61000-6. Niveau d’essai des champs électromagnétiques rayonnés aux fréquences radioélectriques porté à 6 GHz;
c) alignement des exigences CEM concernant les émissions sur celles de la publication CISPR 11 actuelle.

General Information

• Status: Published
• Publication Date: 08-May-2019
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 29.130.20 - Low voltage switchgear and controlgear
• Technical Committee: SC 121A - Low-voltage switchgear and controlgear
• Drafting Committee: WG 3 - TC 121/SC 121A/WG 3
• Current Stage: PPUB - Publication issued
• Start Date: 24-May-2019
• Completion Date: 09-May-2019

Relations

• Revises: IEC 62026-1:2007 - Low-voltage switchgear and controlgear - Controller-device interfaces (CDIs) - Part 1: General rules
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 62026-1 ®
Edition 3.0 2019-05
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Low-voltage switchgear and controlgear – Controller-device interfaces (CDIs) –
Part 1: General rules
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
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IEC Central Office Tel.: [phone]
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Switzerland
About the IEC
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.

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If you wish to give us your feedback on this publication or CISPR.

need further assistance, please contact the Customer Service

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IEC 62026-1 ®
Edition 3.0 2019-05
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Low-voltage switchgear and controlgear – Controller-device interfaces (CDIs) –

Part 1: General rules
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.130.20 ISBN 978-2-8322-6929-9

– 2 – IEC 62026-1:2019 RLV © IEC 2019
CONTENTS
FOREWORD . 3
INTRODUCTION . 2
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
4 Classifications . 8
5 Characteristics . 9
5.1 CDI components . 9
5.2 Interfaces . 9
5.3 Topology . 9
5.4 Information exchanges . 9
5.5 Attributes . 9
6 Product information . 10
6.1 Instructions for installation, operation and maintenance . 10
6.2 Profiles . 10
6.3 Marking . 10
6.4 Degree of protection . 10
7 Normal service, mounting and transport conditions . 10
7.1 General . 10
7.2 Normal service conditions . 10
7.2.1 General . 10
7.2.2 Ambient air temperature . 10
7.2.3 Altitude . 11
7.2.4 Climatic conditions . 11
7.3 Conditions during transport and storage . 11
7.4 Mounting . 11
8 Constructional and performance requirements . 11
8.1 General . 11
8.2 Electromagnetic compatibility (EMC) . 12
8.2.1 Immunity . 12
8.2.2 Emission . 12
8.2.3 EMC tests . 13
9 Tests . 13
9.1 General . 13
9.2 Type tests . 13
9.3 Electromagnetic compatibility . 13
Bibliography . 14

Table 1 – Immunity requirements . 12

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR –
CONTROLLER-DEVICE INTERFACES (CDIs) –

Part 1: General rules
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
misinterpretation by any end user.
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.
This redline version of the official IEC Standard allows the user to identify the changes
made to the previous edition. A vertical bar appears in the margin wherever a change
has been made. Additions are in green text, deletions are in strikethrough red text.

– 4 – IEC 62026-1:2019 RLV © IEC 2019
International Standard IEC 62026-1 has been prepared by subcommittee 121A: Low-voltage
switchgear and controlgear, of IEC technical committee 121: Switchgear and controlgear and
their assemblies for low voltage.
This third edition cancels and replaces the second edition published in 2007. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) additional requirements for safety information and instructions, including the measures to
be taken, if any, for achieving EMC compliance;
b) EMC immunity requirements aligned with current IEC 61000-6 series of standards.
Radiated radio-frequency electromagnetic fields test level increased to 6 GHz;
c) EMC emissions requirements aligned with current CISPR 11 publication.
The text of this International Standard is based on the following documents:
FDIS Report on voting
121A/280/FDIS 121A/295/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 document has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts of the IEC 62026, under the general title Low-voltage switchgear and
controlgear – Controller-device interfaces (CDIs), can be found on the IEC website.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
IMPORTANT – The “colour inside” logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct understanding
of its contents. Users should therefore print this publication using a colour printer.

INTRODUCTION
The class of controller-device interfaces (CDIs) covered in this document includes industrial
CDIs for control systems, factory automation and process automation.
Industrial CDIs have proliferated to meet specific user needs, but no single CDI meets all
needs. The reason for multiple solutions is the wide range of physical, usage, information
content and configuration requirements. The physical requirements have resulted in CDIs with
widely differing signal and line conditioning mechanisms in order to meet distance, node count
and environmental considerations.
While there is wide variation in CDI technologies, there are common components, interfaces
and environmental requirements that are specified by this document. Standardized definitions
of these common CDI requirements assist the user
...

IEC 62026-1 ®
Edition 3.0 2019-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Low-voltage switchgear and controlgear – Controller-device interfaces (CDIs) –
Part 1: General rules
Appareillage à basse tension – Interfaces appareil de commande-appareil (CDI) –
Partie 1: Règles générales
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
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CH-1211 Geneva 20 www.iec.ch
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About the IEC
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
The advanced search enables to find IEC publications by a The world's leading online dictionary on electrotechnology,
variety of criteria (reference number, text, technical containing more than 22 000 terminological entries in English
committee,…). It also gives information on projects, replaced and French, with equivalent terms in 16 additional languages.
and withdrawn publications. Also known as the International Electrotechnical Vocabulary

(IEV) online.
IEC Just Published - webstore.iec.ch/justpublished
Stay up to date on all new IEC publications. Just Published IEC Glossary - std.iec.ch/glossary
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once a month by email. French extracted from the Terms and Definitions clause of
IEC publications issued since 2002. Some entries have been
IEC Customer Service Centre - webstore.iec.ch/csc collected from earlier publications of IEC TC 37, 77, 86 and
If you wish to give us your feedback on this publication or CISPR.

need further assistance, please contact the Customer Service

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IEC 62026-1 ®
Edition 3.0 2019-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Low-voltage switchgear and controlgear – Controller-device interfaces (CDIs) –

Part 1: General rules
Appareillage à basse tension – Interfaces appareil de commande-appareil (CDI) –

Partie 1: Règles générales
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.130.20 ISBN 978-2-8322-6868-1

– 2 – IEC 62026-1:2019 © IEC 2019
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
4 Classifications . 8
5 Characteristics . 8
5.1 CDI components . 8
5.2 Interfaces . 9
5.3 Topology . 9
5.4 Information exchanges . 9
5.5 Attributes . 9
6 Product information . 9
6.1 Instructions for installation, operation and maintenance . 9
6.2 Profiles . 9
6.3 Marking . 10
6.4 Degree of protection . 10
7 Normal service, mounting and transport conditions . 10
7.1 General . 10
7.2 Normal service conditions . 10
7.2.1 General . 10
7.2.2 Ambient air temperature . 10
7.2.3 Altitude . 10
7.2.4 Climatic conditions . 10
7.3 Conditions during transport and storage . 11
7.4 Mounting . 11
8 Constructional and performance requirements . 11
8.1 General . 11
8.2 Electromagnetic compatibility (EMC) . 11
8.2.1 Immunity . 11
8.2.2 Emission . 12
8.2.3 EMC tests . 12
9 Tests . 12
9.1 General . 12
9.2 Type tests . 13
9.3 Electromagnetic compatibility . 13
Bibliography . 14

Table 1 – Immunity requirements . 12

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR –
CONTROLLER-DEVICE INTERFACES (CDIs) –

Part 1: General rules
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
misinterpretation by any end user.
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.
International Standard IEC 62026-1 has been prepared by subcommittee 121A: Low-voltage
switchgear and controlgear, of IEC technical committee 121: Switchgear and controlgear and
their assemblies for low voltage.
This third edition cancels and replaces the second edition published in 2007. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) additional requirements for safety info
...