IEC 62026-1:2019
(Main)Low-voltage switchgear and controlgear - Controller-device interfaces (CDIs) - Part 1: General rules
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.
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IEC 62026-1 ®
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INTERNATIONAL
STANDARD
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Low-voltage switchgear and controlgear – Controller-device interfaces (CDIs) –
Part 1: General rules
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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
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– 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 in comparing and selecting technologies to
match the distance, node count, throughout and installation requirements for a specific
application.
This document simplifies the CDI selection process by providing a common structure for
generating a specific CDI’s IEC standard while also allowing specific interface features and
capabilities to be included. Clauses 1 4 to 8 contain the outline of general requirements that
the CDI’s IEC standard identifies. Clause 9 contains the test specification.
Standardization of CDI aspects also simplifies the task of writing the software for the higher
layer functions of industrial control systems, such as supervisory control, operator interface
and control strategy programming.
For this document to be complete and usable, it requires the availability of specific CDI
standards, which make up the other parts of the IEC 62026 series.
– 6 – IEC 62026-1:2019 RLV © IEC 2019
LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR –
CONTROLLER-DEVICE INTERFACES (CDIs) –
Part 1: General rules
1 Scope
This part of IEC 62026 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.
The purpose of this document is to harmonize and define rules, components and requirements
of a general nature applicable to industrial CDIs. Those features of the various CDI standards
which can be considered as general have therefore been brought together in this document.
For each CDI, two main documents are necessary to determine all requirements and tests:
a) this document, referred to as “IEC 62026-1” in the relevant CDI parts covering the various
types of CDIs;
b) the specific CDI part of the IEC 62026 series.
A specific CDI part may omit a general requirement if it is not applicable, or it may add to it if
it is inadequate in the particular case, but it should not deviate from the requirement unless
there is substantial technical justification.
NOTE Product-specific requirements for products incorporating a CDI are given in the relevant product standards.
These requirements apply in addition to those given in this document.
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.
IEC 60947-1:2007, Low-voltage switchgear and controlgear − Part 1: General rules
IEC 60947-1:2007/AMD1:2010
IEC 60947-1:2007/AMD2:2014
IEC 61000-4-2:19952008, Electromagnetic compatibility (EMC) – Part 4-2: Testing and
measurement techniques – Electrostatic discharge immunity test
Amendment 1 (1998)
Amendment 2 (2000)
IEC 61000-4-3:2006, Electromagnetic compatibility (EMC) – Part 4-3: Testing and
measurement techniques – Radiated, radio-frequency, electromagnetic field immunity test
IEC 61000-4-3:2006/AMD1:2007
IEC 61000-4-3:2006/AMD2:2010
IEC 61000-4-4:20042012, Electromagnetic compatibility (EMC) – Part 4-4: Testing and
measurement techniques – Electrical fast transient/burst immunity test
IEC 61000-4-5:20052014, Electromagnetic compatibility (EMC) – Part 4-5: Testing and
measurement techniques – Surge immunity test
IEC 61000-4-5:2014/AMD1:2017
IEC 61000-4-6:20032013, Electromagnetic compatibility (EMC) – Part 4-6: Testing and
measurement techniques – Immunity to conducted disturbances, induced by radio-frequency
fields
Amendment 1 (2004)
Amendment 2 (2006)
IEC 61000-6-2:20052016, Electromagnetic compatibility (EMC) – Part 6-2: Generic standards
– Immunity standard for industrial environments
CISPR 11:20032015, Industrial, scientific and medical (ISM) radio-frequency equipment –
Electromagnetic Radio-frequency disturbance characteristics – Limits and methods of
measurement
Amendment 1 (2004)
Amendment 2 (2006)
CISPR 11:2015/AMD1:2016
3 Terms and definitions
For the purposes of this document, the following terms and definitions 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
change of state
process of data exchange which occurs only when a device's or controller's data changes
state according to specific change criteria
3.2
controller
programmable controller, personal computer or equivalent computing hardware in which the
software controlling the application or process runs
3.3
controller-device communication medium
means (such as two or more wires or fibre optic cable) utilized by devices or controllers to
transfer data to other devices or controllers
Note 1 to entry: A CDI that has "power on the communication medium" architecture uses two wires that also
distribute power within the CDI.
3.4
controller-device interface
CDI
arrangement of nodes and their interconnections that transport information between
controllers and devices in an industrial control system
Note 1 to entry: This note applies to the French language only.
3.5
CDI component
device, controller or other component for which the requirements are specified in a CDI part
– 8 – IEC 62026-1:2019 RLV © IEC 2019
3.6
CDI power supply
power supply with characteristics and parameters suitable for the CDI's functionality and
capability
3.7
CDI power distribution medium
inter-connecting means used to transfer power within a CDI
Note 1 to entry: In the case of a CDI that has "power on the communication medium" architecture, the CDI power
distribution medium also transfers data within the CDI.
3.8
device
physical unit containing application elements and that may contain communication elements
EXAMPLE Control circuit device (see 2.2.16 of IEC 60947-1:2007), presence sensing device, pressure sensing
device, actuator, annunciator, operator terminal, motor controller, current sensor, valve control, data logger, bar-
code scanner, push-button, pilot light, etc.
3.9
device profile
representation of device functionality available to the CDI
3.10
multicast
process of data exchange which occurs when a device or controller produces one message to
multiple devices and/or controllers for their appropriate action
3.11
polling
process of data exchange which occurs when a device or a controller sends data to, or
requests data from, a specific device or controller
Note 1 to entry: The receiving device responds to the polling by acting according to the data it receives or by
returning its status data. When this transaction is completed, the device polls the next device in a predetermined
sequence.
3.12
strobing
process of data exchange which occurs when a device or a controller sends a single request
for data from one or more devices and/or controllers
NOTE Each device receiving the message then responds with its requested data in a predetermined sequence.
3.12
port
particular interface of the specified apparatus with the external electromagnetic environment
Note 1 to entry: See Figure 17 of IEC 60947-1:2007 for examples of ports.
[SOURCE: IEC 60947-1:2007, 2.7.1]
4 Classifications
This clause in the specific CDI parts shall list the classifications below, where applicable, with
appropriate details:
– CDI components;
– interfaces;
– topology;
– information exchanges;
– attributes.
5 Characteristics
This clause in the specific CDI parts shall list the applicable characteristics described below
with appropriate details.
5.1 CDI components
Specific CDI parts shall specify requirements for the devices, controllers and other
components that may be used.
5.2 Interfaces
Specific CDI parts shall include information on the following, if applicable:
– procedural, such as what needs to happen first, second, etc., when the interface system
powers up and down, and establishes and terminates data exchange across the interface;
– information exchanges, such as what a device is requested to do across an interface;
EXAMPLE 1 Polling, change of state.
– services and protocol, i.e. the message structure and content that crosses the interface;
EXAMPLE 2 Peer-to-peer, master-slave.
– device and controller behaviour as viewed from the CDI;
– mechanical, i.e. the shape, construction, pin size, etc.;
– electrical, such as the voltage, current and timing of the bit levels on the CDI;
– functional, i.e. what interface connections provide which functions.
5.3 Topology
Specific CDI parts shall specify the topologies that may be used.
EXAMPLE Daisy chain, star, tree, trunk/drop.
5.4 Information exchanges
Specific CDI parts shall specify the information exchanges that may be used.
5.5 Attributes
Specific CDI parts shall specify the applicable attribute values, including, as a minimum:
– data transmission rate (in bits per second);
– maximum length of communication medium or end to end distance;
– message length for single transmission;
EXAMPLE 4 bits, 8 bytes.
– maximum node count per system;
and other information to support the evaluation of the transmission time of the CDI.
– 10 – IEC 62026-1:2019 RLV © IEC 2019
6 Product information
6.1 Instructions for installation, operation and maintenance
The manufacturer shall specify in the documents or catalogues, the conditions for installation,
operation and maintenance of the CDI components.
When relevant, safety information and instructions shall be provided in order to achieve the
safe use of the CDI. Such information shall be easily understood by the user, for example in
the form of commonly used symbols and/or drawings. The instructions shall also specify the
measures to be taken, if any, for achieving EMC compliance as described in 8.2.
6.2 Profiles
Devices and controllers shall be marked with, or shall include in the instructions for operation,
the identification of the device profile(s) supported.
6.3 Marking
CDI components shall be marked as follows:
a) manufacturer’s name or trade mark;
b) type designation or other marking which makes it possible to identify the CDI component
and to get the relevant information from the manufacturer or his catalogue;
c) reference to the relevant CDI parts;
d) any additional marking required by the relevant CDI parts.
For CDI components that do not have the physical space to accommodate the required
markings, the information shall be provided on a label or in the manufacturer's documentation.
6.4 Degree of protection
The manufacturer shall state the degree of protection according to Annex C of
IEC 60947-1:2007 and IEC 60947-1:2007/AMD1:2010.
7 Normal service, mounting and transport conditions
7.1 General
The following requirements given in 7.2, 7.3 and 7.4 shall be met for all CDI components.
NOTE If the conditions for operation differ from those given in this document or by the
manufacturer, the user should state the deviation from the standard conditions and acquire an
agreement with the manufacturer on the suitability for use under such conditions. Information
given in the manufacturer's catalogue may take the place of such an agreement.
7.2 Normal service conditions
7.2.1 General
All CDI components shall be designed and used according to the relevant CDI parts.
CDI components shall be selected to meet expected environmental conditions.
7.2.2 Ambient air temperature
The operating characteristics of all CDI components shall be maintained at least over the CDI
components shall operate as intended within an ambient air temperature range of -5 °C to
+40 °C.
7.2.3 Altitude
CDI components shall be capable of operating at altitudes of up to 2 000 m.
NOTE For CDI components intended to be used at higher altitudes, it is necessary to take into
account both the reduction of the dielectric strength and the cooling effect of air shall be
considered.
7.2.4 Climatic conditions
7.2.4.1 Humidity
CDI components shall be capable of operating correctly as intended at +40 °C with a relative
air humidity of 50 % and with higher relative humidity at lower temperatures, for example
90 % at +20 °C. Special measures may be necessary in cases of occasional condensation
due to variations in temperature.
7.2.4.2 Pollution degree
Unless otherwise stated by the manufacturer, CDI components shall be intended for
installation under environmental conditions of pollution degree 3, as defined in 6.1.3.2 of
IEC 60947-1:2007. However, other pollution degrees may apply, depending upon the micro-
environment.
7.3 Conditions during transport and storage
A special agreement shall be made between user and manufacturer if the conditions during
transport and storage, for example temperature and humidity, differ from those defined in 7.2.
Otherwise, the following temperature range applies during transport and storage: between
–25 °C and +55 °C and, for short periods not exceeding 24 h, up to +70 °C.
7.4 Mounting
Mounting dimensions and conditions of the CDI components shall be specified in the specific
CDI parts or, if not specified, shall be stated in the manufacturer’s instructions.
8 Constructional and performance requirements
8.1 General
All products incorporating a CDI shall comply with their relevant product standards in addition
to this document.
The constructional and performance requirements shall be specified in the specific CDI parts.
Requirements shall be specified for
– power supply;
– device;
– controller;
– electromechanical components;
– communication medium.
– 12 – IEC 62026-1:2019 RLV © IEC 2019
The requirements shall include but are not limited to
– general requirements;
– connections and ports;
– functions of the device or controller during initiating, sending, receiving and responding to
messages, I/O configuration and diagnostic messages;
– electromagnetic compatibility (EMC).
8.2 Electromagnetic compatibility (EMC)
8.2.1 Immunity
CDIs shall meet the minimum requirements given in Table 1, except where a different test
level is given and justified in the specific CDI parts.
Table 1 – Immunity requirements
Reference standard Test levels Performance
Type of test
(where applicable) criterion
Electrostatic discharges IEC 61000-4-2:2008 8 kV / air discharge B
4 kV / contact discharge
Radiated radio-frequency IEC 61000-4-3:2006 10 V/m A
electromagnetic fields
(80 MHz to 1 GHz and
1,4 GHz to 2,0 GHz)
Radiated radio-frequency IEC 61000-4-3:2006 3 V/m A
electromagnetic fields
(1,4 GHz to 6 GHz)
Electrical fast IEC 61000-4-4:2012 1 kV/5 kHz for all cables that
B
transients/bursts contain CDI communication
media.
2 kV/5 kHz for all other cables
and ports.
IEC 61000-4-5:2014 2 kV (AC mains line-to-earth) B
Surges (1,2/50 µs − 8/20 µs)
and IEC 61000-4-
1 kV (AC mains line-to-line)
5:2014/AMD1:2017
Conducted radio-frequency
IEC 61000-4-6:2013 10 V A
disturbances
(150 kHz to 80 MHz)
Voltage dips and interruptions - See specific CDI parts -
Performance criteria and specified limits shall be given in the specific CDI parts using the
general performance criteria of IEC 61000-6-2.
8.2.2 Emission
CDIs shall meet the requirements given in CISPR 11:2015 and CISPR 11:2015/AMD1:2016
for class A, group 1.
These requirements apply to CDIs exclusively used in an industrial environment. When they
may be used in a non-industrial environment, the following warning shall be included in the
instructions for use:
Attention
This is a class A product. In a non-industrial environment, this product may cause radio
interference, in which case the user may be required to take adequate measures.
8.2.3 EMC tests
Electromagnetic compatibility tests shall be made in accordance with 9.3.
9 Tests
9.1 General
Tests shall be made to verify compliance with the requirements of this document.
9.2 Type tests
Type tests are intended to verify compliance to this document. Where applicable, they shall
include:
– power supply;
– device;
– controller;
– electromechanical components;
– communication medium.
They shall include, as appropriate, the verification of
– general requirements;
– connections and ports;
– functions of the device or controller during initiating, sending, receiving and responding to
messages, I/O configuration and diagnostic messages;
– electromagnetic compatibility (EMC).
9.3 Electromagnetic compatibility
The specific CDI parts shall detail the test methods and test set-ups.
Emission and immunity tests are type tests and shall be carried out under representative
conditions, both operational and environmental, using the manufacturer’s instructions for
installation.
The tests shall be carried out in accordance with the reference EMC standards. However, the
specific CDI parts shall specify any additional measures necessary to verify the performance.
– 14 – IEC 62026-1:2019 RLV © IEC 2019
Bibliography
IEC 61000-6 (all parts), Electromagnetic compatibility (EMC) – Part 6: Generic standards
IEC 62026 (all parts), Low-voltage switchgear and controlgear – Controller-device interfaces
(CDIs)
___________
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
– 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-
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with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
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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 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.
– 4 – IEC 62026-1:2019 © IEC 2019
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.
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 in comparing and selecting technologies to
match the distance, node count, throughout and installation requirements for a specific
application.
This document simplifies the CDI selection process by providing a common structure for
generating a specific CDI’s IEC standard while also allowing specific interface features and
capabilities to be included. Clauses 4 to 8 contain the outline of general requirements that the
CDI’s IEC standard iden
...
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
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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 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.
– 4 – IEC 62026-1:2019 © IEC 2019
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.
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 in comparing and selecting technologies to
match the distance, node count, throughout and installation requirements for a specific
application.
This document simplifies the CDI selection process by providing a common structure for
generating a specific CDI’s IEC standard while also allowing specific interface features and
capabilities to be included. Clauses 4 to 8 contain the outline of general requirements that the
CDI’s IEC standard identifies. Clause 9 contains the test specification.
Standardization of CDI aspects also simplifies the task of writing the software for the higher
layer functions of industrial control systems, such as supervisory control, operator interface
and control strategy programming.
For this document to be complete and usable, it requires the availability of specific CDI
standards, which make up the other parts of the IEC 62026 series.
– 6 – IEC 62026-1:2019 © IEC 2019
LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR –
CONTROLLER-DEVICE INTERFACES (CDIs) –
Part 1: General rules
1 Scope
This part of IEC 62026 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.
The purpose of this document is to harmonize and define rules, components and requirements
of a general nature applicable to industrial CDIs. Those features of the various CDI standards
which can be considered as general have therefore been brought together in this document.
For each CDI, two main documents are necessary to determine all requirements and tests:
a) this document, referred to as “IEC 62026-1” in the relevant CDI parts covering the various
types of CDIs;
b) the specific CDI part of the IEC 62026 series.
A specific CDI part may omit a general requirement if it is not applicable, or it may add to it if
it is inadequate in the particular case.
NOTE Product-specific requirements for products incorporating a CDI are given in the relevant product standards.
These requirements apply in addition to those given in this document.
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.
IEC 60947-1:2007, Low-voltage switchgear and controlgear − Part 1: General rules
IEC 60947-1:2007/AMD1:2010
IEC 60947-1:2007/AMD2:2014
IEC 61000-4-2:2008, Electromagnetic compatibility (EMC) – Part 4-2: Testing and
measurement techniques – Electrostatic discharge immunity test
IEC 61000-4-3:2006, Electromagnetic compatibility (EMC) – Part 4-3: Testing and
measurement techniques – Radiated, radio-frequency, electromagnetic field immunity test
IEC 61000-4-3:2006/AMD1:2007
IEC 61000-4-3:2006/AMD2:2010
IEC 61000-4-4:2012, Electromagnetic compatibility (EMC) – Part 4-4: Testing and
measurement techniques – Electrical fast transient/burst immunity test
IEC 61000-4-5:2014, Electromagnetic compatibility (EMC) – Part 4-5: Testing and
measurement techniques – Surge immunity test
IEC 61000-4-5:2014/AMD1:2017
IEC 61000-4-6:2013, Electromagnetic compatibility (EMC) – Part 4-6: Testing and
measurement techniques – Immunity to conducted disturbances, induced by radio-frequency
fields
IEC 61000-6-2:2016, Electromagnetic compatibility (EMC) – Part 6-2: Generic standards –
Immunity standard for industrial environments
CISPR 11:2015, Industrial, scientific and medical equipment – Radio-frequency disturbance
characteristics – Limits and methods of measurement
CISPR 11:2015/AMD1:2016
3 Terms and definitions
For the purposes of this document, the following terms and definitions 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
change of state
process of data exchange which occurs only when a device's or controller's data changes
state according to specific change criteria
3.2
controller
programmable controller, personal computer or equivalent computing hardware in which the
software controlling the application or process runs
3.3
controller-device communication medium
means (such as two or more wires or fibre optic cable) utilized by devices or controllers to
transfer data to other devices or controllers
Note 1 to entry: A CDI that has "power on the communication medium" architecture uses two wires that also
distribute power within the CDI.
3.4
controller-device interface
CDI
arrangement of nodes and their interconnections that transport information between
controllers and devices in an industrial control system
Note 1 to entry: This note applies to the French language only.
3.5
CDI component
device, controller or other component for which the requirements are specified in a CDI part
3.6
CDI power supply
power supply with characteristics and parameters suitable for the CDI's functionality and
capability
– 8 – IEC 62026-1:2019 © IEC 2019
3.7
CDI power distribution medium
inter-connecting means used to transfer power within a CDI
Note 1 to entry: In the case of a CDI that has "power on the communication medium" architecture, the CDI power
distribution medium also transfers data within the CDI.
3.8
device
physical unit containing application elements and that may contain communication elements
EXAMPLE Control circuit device (see 2.2.16 of IEC 60947-1:2007), presence sensing device, pressure sensing
device, actuator, annunciator, operator terminal, motor controller, current sensor, valve control, data logger, bar-
code scanner, push-button, pilot light, etc.
3.9
device profile
representation of device functionality available to the CDI
3.10
multicast
process of data exchange which occurs when a device or controller produces one message to
multiple devices and/or controllers for their appropriate action
3.11
polling
process of data exchange which occurs when a device or a controller sends data to, or
requests data from, a specific device or controller
Note 1 to entry: The receiving device responds to the polling by acting according to the data it receives or by
returning its status data. When this transaction is completed, the device polls the next device in a predetermined
sequence.
3.12
port
particular interface of the specified apparatus with the external electromagnetic environment
Note 1 to entry: See Figure 17 of IEC 60947-1:2007 for examples of ports.
[SOURCE: IEC 60947-1:2007, 2.7.1]
4 Classifications
This clause in the specific CDI parts shall list the classifications below, where applicable, with
appropriate details:
– CDI components;
– interfaces;
– topology;
– information exchanges;
– attributes.
5 Characteristics
5.1 CDI components
Specific CDI parts shall specify requirements for the devices, controllers and other
components that may be used.
5.2 Interfaces
Specific CDI parts shall include information on the following, if applicable:
– procedural, such as what needs to happen first, second, etc., when the interface system
powers up and down, and establishes and terminates data exchange across the interface;
– information exchanges, such as what a device is requested to do across an interface;
EXAMPLE 1 Polling, change of state.
– services and protocol, i.e. the message structure and content that crosses the interface;
EXAMPLE 2 Peer-to-peer, master-slave.
– device and controller behaviour as viewed from the CDI;
– mechanical, i.e. the shape, construction, pin size, etc.;
– electrical, such as the voltage, current and timing of the bit levels on the CDI;
– functional, i.e. what interface connections provide which functions.
5.3 Topology
Specific CDI parts shall specify the topologies that may be used.
EXAMPLE Daisy chain, star, tree, trunk/drop.
5.4 Information exchanges
Specific CDI parts shall specify the information exchanges that may be used.
5.5 Attributes
Specific CDI parts shall specify the applicable attribute values, including, as a minimum:
– data transmission rate (in bits per second);
– maximum length of communication medium or end to end distance;
– message length for single transmission;
EXAMPLE 4 bits, 8 bytes.
– maximum node count per system;
and other information to support the evaluation of the transmission time of the CDI.
6 Product information
6.1 Instructions for installation, operation and maintenance
The manufacturer shall specify in the documents or catalogues, the conditions for installation,
operation and maintenance of the CDI components.
When relevant, safety information and instructions shall be provided in order to achieve the
safe use of the CDI. Such information shall be easily understood by the user, for example in
the form of commonly used symbols and/or drawings. The instructions shall also specify the
measures to be taken, if any, for achieving EMC compliance as described in 8.2.
6.2 Profiles
Devices and controllers shall be marked with, or shall include in the instructions for operation,
the identification of the device profile(s) supported.
– 10 – IEC 62026-1:2019 © IEC 2019
6.3 Marking
CDI components shall be marked as follows:
a) manufacturer’s name or trade mark;
b) type designation or other marking which makes it possible to identify the CDI component
and to get the relevant information from the manufacturer or his catalogue;
c) reference to the relevant CDI part;
d) any additional marking required by the relevant CDI part.
For CDI components that do not have the physical space to accommodate the required
markings, the information shall be provided on a label or in the manufacturer's documentation.
6.4 Degree of protection
The manufacturer shall state the degree of protection according to Annex C of IEC 60947-
1:2007 and IEC 60947-1:2007/AMD1:2010.
7 Normal service, mounting and transport conditions
7.1 General
The requirements given in 7.2, 7.3 and 7.4 shall be met for all CDI components.
If the conditions for operation differ from those given in this document or by the manufacturer,
the user should state the deviation from the standard conditions and acquire an agreement
with the manufacturer on the suitability for use under such conditions. Information given in the
manufacturer's catalogue may take the place of such an agreement.
7.2 Normal service conditions
7.2.1 General
CDI components shall be selected to meet expected environmental conditions.
7.2.2 Ambient air temperature
CDI components shall operate as intended within an ambient air temperature range of -5 °C to
+40 °C.
7.2.3 Altitude
CDI components shall be capable of operating at altitudes of up to 2 000 m.
For CDI components intended to be used at higher altitudes, both the reduction of the
dielectric strength and the cooling effect of air shall be considered.
7.2.4 Climatic conditions
7.2.4.1 Humidity
CDI components shall be capable of operating as intended at +40 °C with a relative air
humidity of 50 % and with higher relative humidity at lower temperatures, for example 90 % at
+20 °C. Special measures may be necessary in cases of occasional condensation due to
variations in temperature.
7.2.4.2 Pollution degree
Unless otherwise stated by the manufacturer, CDI components shall be intended for
installation under environmental conditions of pollution degree 3, as defined in 6.1.3.2 of
IEC 60947-1:2007. However, other pollution degrees may apply, depending upon the micro-
environment.
7.3 Conditions during transport and storage
A special agreement shall be made between user and manufacturer if the conditions during
transport and storage, for example temperature and humidity, differ from those defined in 7.2.
Otherwise, the following temperature range applies during transport and storage: between
–25 °C and +55 °C and, for short periods not exceeding 24 h, up to +70 °C.
7.4 Mounting
Mounting dimensions and conditions of the CDI components shall be specified in the specific
CDI parts or, if not specified, shall be stated in the manufacturer’s instructions.
8 Constructional and performance requirements
8.1 General
All products incorporating a CDI shall comply with their relevant product standards in addition
to this document.
The constructional and performance requirements shall be specified in the specific CDI parts.
Requirements shall be specified for
– power supply;
– device;
– controller;
– electromechanical components;
– communication medium.
The requirements shall include but are not limited to
– general requirements;
– connections and ports;
– functions of the device or controller during initiating, sending, receiving and responding to
messages, I/O configuration and diagnostic messages;
– electromagnetic compatibility (EMC).
8.2 Electromagnetic compatibility (EMC)
8.2.1 Immunity
CDIs shall meet the minimum requirements given in Table 1, except where a different test
level is given and justified in the specific CDI parts.
– 12 – IEC 62026-1:2019 © IEC 2019
Table 1 – Immunity requirements
Reference standard Test levels Performance
Type of test
(where applicable) criterion
Electrostatic discharges IEC 61000-4-2:2008 8 kV / air discharge B
4 kV / contact discharge
Radiated radio-frequency IEC 61000-4-3:2006 10 V/m A
electromagnetic fields
(80 MHz to 1 GHz)
Radiated radio-frequency IEC 61000-4-3:2006 3 V/m A
electromagnetic fields
(1,4 GHz to 6 GHz)
Electrical fast IEC 61000-4-4:2012 1 kV/5 kHz for all cables that B
transients/bursts contain CDI communication
media.
2 kV/5 kHz for all other cables
and ports.
Surges (1,2/50 µs − 8/20 µs) IEC 61000-4-5:2014 2 kV (AC mains line-to-earth) B
and IEC 61000-4-
1 kV (AC mains line-to-line)
5:2014/AMD1:2017
Conducted radio-frequency IEC 61000-4-6:2013 10 V A
disturbances
(150 kHz to 80 MHz)
Voltage dips and interruptions - See specific CDI parts -
Performance criteria and specified limits shall be given in the specific CDI parts using the
general performance criteria of IEC 61000-6-2.
8.2.2 Emission
CDIs shall meet the requirements given in CISPR 11:2015 and CISPR 11:2015/AMD1:2016
for class A, group 1.
These requirements apply to CDIs exclusively used in an industrial environment. When they
may be used in a non-industrial environment, the following warning shall be included in the
instructions for use:
Attention
This is a class A product. In a non-industrial environment, this product may cause radio
interference, in which case the user may be required to take adequate measures.
8.2.3 EMC tests
Electromagnetic compatibility tests shall be made in accordance with 9.3.
9 Tests
9.1 General
Tests shall be made to verify compliance with the requirements of this document.
9.2 Type tests
Type tests are intended to verify compliance to this document. Where applicable, they shall
include:
– power supply;
– device;
– controller;
– electromechanical components;
– communication medium.
They shall include, as appropriate, the verification of
– general requirements;
– connections and ports;
– functions of the device or controller during initiating, sending, recei
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