Electrical equipment for measurement, control and laboratory use - EMC requirements - Part 3-1: Immunity requirements for safety-related systems and for equipment intended to perform safety-related functions (functional safety) - General industrial applications (IEC 61326-3-1:2017)

This part of IEC 61326 covers all equipment within the scope of IEC 61326-1, but is limited to
systems and equipment for industrial applications intended to perform safety functions as
defined in IEC 61508 with SIL 1-3.
The electromagnetic environments encompassed by this product family standard are
industrial, both indoor and outdoor, as described for industrial locations in IEC 61000-6-2 or
defined in 3.8 of IEC 61326-1. Equipment and systems intended for use in other
electromagnetic environments, for example, in the process industry or in environments with
potentially explosive atmospheres, are excluded from the scope of this document.
Equipment and systems considered as “proven-in-use” according to IEC 61508 or “prior use”
according to IEC 61511 are excluded from the scope of this document.
Fire alarm systems and security alarm systems intended for protection of buildings are
excluded from the scope of this document.

Elektrische Mess-, Steuer-, Regel- und Laborgeräte - EMV-Anforderungen - Teil 3-1: Störfestigkeitsanforderungen für sicherheitsbezogene Systeme und für Geräte, die für sicherheitsbezogene Funktionen vorgesehen sind (Funktionale Sicherheit) - Allgemeine industrielle Anwendungen (IEC 61326-3-1:2017)

Matériel électrique de mesure, de commande et de laboratoire - Exigences relatives à la CEM - Partie 3-1: Exigences d'immunité pour les systèmes relatifs à la sécurité et pour les matériels destinés à réaliser des fonctions relatives à la sécurité (sécurité fonctionnelle) - Applications industrielles générales (IEC 61326-3-1:2017)

NEW!IEC 61326-3-1:2017 est disponible sous forme de IEC 61326-3-1:2017 RLV qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente.L’IEC 61326-3-1:2017 couvre tous les matériels qui relèvent du domaine d’application de l’IEC 61326-1, mais est limitée aux systèmes et matériels pour applications industrielles destinés à réaliser des fonctions de sécurité telles que définies dans l’IEC 61508, avec un niveau d’intégrité de sécurité (SIL) 1-3. Cette deuxième édition annule et remplace la première édition parue en 2008. Cette édition constitue une révision technique.  Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente: - extension de la plage de fréquences jusqu’à 6 GHz pour l’essai de champ électromagnétique à fréquences radioélectriques, conformément à l’IEC 61000-4-3, - remplacement du critère de performance FS par DS, conformément à la norme générique IEC 61000-6-7, - ajout du Tableau 1 – aspects à prendre en considération lors de l'application du critère de performance DS, - intégration d’essais d’immunité pour les dispositifs ayant une consommation de courant > 16 A, conformément à l’IEC 61000-4-34, - mise à jour du Tableau 8 - Plages de fréquences des émetteurs mobiles et des matériels ISM, - mise à jour de la Figure A.1 et de la Figure 1 pour une meilleure lisibilité.

Električna oprema za merjenje, nadzor in laboratorijsko uporabo - Zahteve elektromagnetne združljivosti (EMC) - 3-1. del: Zahteve za odpornost sistemov, povezanih z varnostjo, in opreme, namenjene za opravljanje funkcij, povezanih z varnostjo (funkcijska varnost) - Splošna industrijska uporaba (IEC 61326-3-1:2017)

Ta del standarda IEC 61326 zajema vso opremo, ki sodi na področje uporabe standarda IEC 61326-1, vendar se omejuje na sisteme in opremo za industrijsko uporabo, ki so namenjeni izvajanju varnostnih funkcij, kot je opredeljeno v standardu IEC 61508, z ravnjo celovite varnosti 1-3.
Elektromagnetna okolja, ki so zajeta v tem standardu za skupino proizvodov, so industrijska okolja, tako notranja kot zunanja, kot je opisano za industrijske lokacije v standardu IEC 61000-6-2 ali opredeljeno v točki 3.8 standarda IEC 61326-1. Oprema in sistemi, namenjeni za uporabo v drugih elektromagnetnih okoljih, na primer v procesni industriji, ali v okoljih s potencialno eksplozivnimi atmosferami, ne spadajo na področje uporabe tega dokumenta.
Oprema in sistemi, ki so obravnavani kot »dokazani z uporabo« v skladu s standardom IEC 61508 ali kot »pred uporabo« v skladu s standardom IEC 61511, ne spadajo na področje uporabe tega dokumenta.
Sistemi za javljanje požara in varnostni alarmni sistemi, namenjeni za zaščito stavb, ne spadajo na področje uporabe tega dokumenta.

General Information

Status
Published
Publication Date
22-Nov-2017
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
22-Aug-2017
Due Date
27-Oct-2017
Completion Date
23-Nov-2017

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SLOVENSKI STANDARD
SIST EN 61326-3-1:2017
01-december-2017
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SIST EN 61326-3-1:2008
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Electrical equipment for measurement, control and laboratory use - EMC requirements -

Part 3-1: Immunity requirements for safety-related systems and for equipment intended

to perform safety-related functions (functional safety) - General industrial applications

(IEC 61326-3-1:2017)

Elektrische Mess-, Steuer-, Regel- und Laborgeräte - EMV-Anforderungen - Teil 3-1:

Störfestigkeitsanforderungen für sicherheitsbezogene Systeme und für Geräte, die für

sicherheitsbezogene Funktionen vorgesehen sind (Funktionale Sicherheit) - Allgemeine

industrielle Anwendungen (IEC 61326-3-1:2017)

Matériel électrique de mesure, de commande et de laboratoire - Exigences relatives à la

CEM - Partie 3-1: Exigences d'immunité pour les systèmes relatifs à la sécurité et pour

les matériels destinés à réaliser des fonctions relatives à la sécurité (sécurité

fonctionnelle) - Applications industrielles générales (IEC 61326-3-1:2017)
Ta slovenski standard je istoveten z: EN 61326-3-1:2017
ICS:
25.040.40 Merjenje in krmiljenje Industrial process
industrijskih postopkov measurement and control
33.100.20 Imunost Immunity
SIST EN 61326-3-1:2017 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN 61326-3-1:2017
---------------------- Page: 2 ----------------------
SIST EN 61326-3-1:2017
EUROPEAN STANDARD EN 61326-3-1
NORME EUROPÉENNE
EUROPÄISCHE NORM
July 2017
ICS 25.040.40; 33.100.20 Supersedes EN 61326-3-1:2008
English Version
Electrical equipment for measurement, control and laboratory
use - EMC requirements - Part 3-1: Immunity requirements for
safety-related systems and for equipment intended to perform
safety-related functions (functional safety) - General industrial
applications
(IEC 61326-3-1:2017)

Matériel électrique de mesure, de commande et de Elektrische Mess-, Steuer-, Regel- und Laborgeräte - EMV-

laboratoire - Exigences relatives à la CEM - Partie 3-1: Anforderungen - Teil 3-1: Störfestigkeitsanforderungen für

Exigences d'immunité pour les systèmes relatifs à la sicherheitsbezogene Systeme und für Geräte, die für

sécurité et pour les matériels destinés à réaliser des sicherheitsbezogene Funktionen vorgesehen sind

fonctions relatives à la sécurité (sécurité fonctionnelle) - (Funktionale Sicherheit) - Allgemeine industrielle

Applications industrielles générales Anwendungen
(IEC 61326-3-1:2017) (IEC 61326-3-1:2017)

This European Standard was approved by CENELEC on 2017-06-20. CENELEC members are bound to comply with the CEN/CENELEC

Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.

Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC

Management Centre or to any CENELEC member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by translation

under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the

same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,

Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,

Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden,

Switzerland, Turkey and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels

© 2017 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.

Ref. No. EN 61326-3-1:2017 E
---------------------- Page: 3 ----------------------
SIST EN 61326-3-1:2017
EN 61326-3-1:2017
European foreword

The text of document 65A/819/FDIS, future edition 2 of IEC 61326-3-1, prepared by SC 65A "System

aspects", of IEC/TC 65 "Industrial-process measurement, control and automation" was submitted to

the IEC-CENELEC parallel vote and approved by CENELEC as EN 61326-3-1:2017.
The following dates are fixed:
(dop) 2018-03-20
• latest date by which the document has to be implemented at
national level by publication of an identical national
standard or by endorsement
• latest date by which the national standards conflicting with (dow) 2020-06-20
the document have to be withdrawn
This document supersedes EN 61326-3-1:2008.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.

Endorsement notice

The text of the International Standard IEC 61326-3-1:2017 was approved by CENELEC as a

European Standard without any modification.

In the official version, for Bibliography, the following notes have to be added for the standards

indicated:
IEC 60204-1:2005 NOTE Harmonized as EN 60204-1:2006.
IEC 61000 (series) NOTE Harmonized as EN 61000 (series).
IEC 61000-1-2:2005 NOTE Harmonized as EN 60204-1:2006.
IEC 61000-6-5 NOTE Harmonized as EN 61000-6-5.
IEC 61000-6-7 NOTE Harmonized as EN 61000-6-7.
IEC 61326-2-1:2012 NOTE Harmonized as EN 61326-2-1:2013.
IEC 61326-2-2:2012 NOTE Harmonized as EN 61326-2-2:2013.
IEC 61326-2-3:2012 NOTE Harmonized as EN 61326-2-3:2013.
IEC 61326-2-4:2012 NOTE Harmonized as EN 61326-2-4:2013.
IEC 61326-2-5:2012 NOTE Harmonized as EN 61326-2-5:2013.
IEC 61326-3-1:2008 NOTE Harmonized as EN 61326-3-1:2008.
IEC 61508 (series) NOTE Harmonized as EN 61508 (series).
---------------------- Page: 4 ----------------------
SIST EN 61326-3-1:2017
EN 61326-3-1:2017
IEC 61508-1:2010 NOTE Harmonized as EN 61508-1:2010.
IEC 61508-4:2010 NOTE Harmonized as EN 61508-4:2010.
IEC 61511 (series) NOTE Harmonized as EN 61511 (series).
IEC 61784-3 NOTE Harmonized as EN 61784-3.
---------------------- Page: 5 ----------------------
SIST EN 61326-3-1:2017
EN 61326-3-1:2017
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

The following documents, in whole or in part, are normatively referenced in this document and are

indispensable for its application. For dated references, only the edition cited applies. For undated

references, the latest edition of the referenced document (including any amendments) applies.

NOTE 1 When an International Publication has been modified by common modifications, indicated by (mod), the relevant

EN/HD applies.

NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available here:

www.cenelec.eu.
Publication Year Title EN/HD Year
IEC 60050-161 - International Electrotechnical Vocabulary - -
(IEV) -- Chapter 161: Electromagnetic
compatibility

IEC 61000-4-2 2008 Electromagnetic compatibility (EMC) -- PartE N 61000-4-2 2009

4-2: Testing and measurement techniques
- Electrostatic discharge immunity test

IEC 61000-4-3 2006 Electromagnetic compatibility (EMC) -- PartE N 61000-4-3 2006

4-3: Testing and measurement techniques
- Radiated, radio-frequency,
electromagnetic field immunity test
+ A1 2007 + A1 2008
+ A2 2010 + A2 2010

IEC 61000-4-4 2012 Electromagnetic compatibility (EMC) -- PartE N 61000-4-4 2012

4-4: Testing and measurement techniques
- Electrical fast transient/burst immunity
test
IEC 61000-4-5 2014 Electromagnetic compatibility (EMC) - PartEN 61000-4-5 2014
4-5: Testing and measurement techniques
- Surge immunity test

IEC 61000-4-6 2013 Electromagnetic compatibility (EMC) -- PartE N 61000-4-6 2014

4-6: Testing and measurement techniques
- Immunity to conducted disturbances,
induced by radio-frequency fields

IEC 61000-4-8 2009 Electromagnetic compatibility (EMC) -- PartE N 61000-4-8 2010

4-8: Testing and measurement techniques
- Power frequency magnetic field immunity
test

IEC 61000-4-11 2004 Electromagnetic compatibility (EMC) -- PartE N 61000-4-11 2004

4-11: Testing and measurement
techniques - Voltage dips, short
interruptions and voltage variations
immunity tests

IEC 61000-4-16 2015 Electromagnetic compatibility (EMC) - PartE N 61000-4-16 2016

4-16: Testing and measurement
techniques - Test for immunity to
conducted, common mode disturbances in
the frequency range 0 Hz to 150 kHz
---------------------- Page: 6 ----------------------
SIST EN 61326-3-1:2017
EN 61326-3-1:2017

IEC 61000-4-29 2000 Electromagnetic compatibility (EMC) -- PartE N 61000-4-29 2000

4-29: Testing and measurement
techniques - Voltage dips, short
interruptions and voltage variations on d.c.
input power port immunity tests

IEC 61000-4-34 2005 Electromagnetic compatibility (EMC) -- PartE N 61000-4-34 2007

4-34: Testing and measurement
techniques - Voltage dips, short
interruptions and voltage variations
immunity tests for equipment with input
current more than 16 A per phase
+ A1 2009 + A1 2009
IEC 61000-6-2 2016 Electromagnetic compatibility (EMC) - PartE N 61000-6-2 2017
6-2: Generic standards - Immunity
standard for industrial environments
IEC 61326-1 2012 Electrical equipment for measurement, EN 61326-1 2013
control and laboratory use - EMC
requirements -- Part 1: General
requirements
IEC 61326-3-2 - - -
IEC 61508-2 2010 Functional safety of EN 61508-2 2010
electrical/electronic/programmable
electronic safety-related systems -- Part 2:
Requirements for
electrical/electronic/programmable
electronic safety-related systems
---------------------- Page: 7 ----------------------
SIST EN 61326-3-1:2017
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SIST EN 61326-3-1:2017
IEC 61326-3-1
Edition 2.0 2017-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Electrical equipment for measurement, control and laboratory use – EMC
requirements –
Part 3-1: Immunity requirements for safety-related systems and for equipment
intended to perform safety-related functions (functional safety) – General
industrial applications
Matériel électrique de mesure, de commande et de laboratoire – Exigences
relatives à la CEM –
Partie 3-1: Exigences d'immunité pour les systèmes relatifs à la sécurité et
pour les matériels destinés à réaliser des fonctions relatives à la sécurité
(sécurité fonctionnelle) – Applications industrielles générales
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 25.040.40; 33.100.20 ISBN 978-2-8322-4212-4

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: 9 ----------------------
SIST EN 61326-3-1:2017
– 2 – IEC 61326-3-1:2017 © IEC 2017
CONTENTS

FOREWORD ........................................................................................................................... 4

INTRODUCTION ..................................................................................................................... 6

1 Scope .............................................................................................................................. 8

2 Normative references ...................................................................................................... 8

3 Terms, definitions and abbreviations ............................................................................... 9

3.1 Terms and definitions .............................................................................................. 9

3.2 Abbreviations ........................................................................................................ 12

4 General ......................................................................................................................... 13

5 EMC test plan ................................................................................................................ 13

5.1 General ................................................................................................................. 13

5.2 Instruction for testing ............................................................................................ 13

5.3 Configuration of EUT during testing ...................................................................... 14

5.3.1 General ......................................................................................................... 14

5.3.2 Composition of EUT ....................................................................................... 14

5.3.3 Assembly of EUT ........................................................................................... 14

5.3.4 I/O ports ........................................................................................................ 14

5.3.5 Auxiliary equipment (AE) ............................................................................... 14

5.3.6 Cabling and earthing (grounding) ................................................................... 14

5.4 Operation conditions of EUT during testing ........................................................... 14

5.4.1 Operation modes ........................................................................................... 14

5.4.2 Environmental conditions ............................................................................... 15

5.4.3 EUT software during test ............................................................................... 15

5.5 Specification of performance criteria ..................................................................... 15

5.6 Test description .................................................................................................... 15

6 Performance criteria ...................................................................................................... 15

6.1 Performance criterion DS ...................................................................................... 15

6.2 Application of the performance criterion DS .......................................................... 16

6.3 Aspects to be considered during application of performance criterion DS .............. 16

7 Immunity requirements .................................................................................................. 17

8 Test set-up and test philosophy for EUTs with functions intended for safety

applications ................................................................................................................... 22

8.1 Testing of safety-related systems and equipment intended to be used in

safety-related systems .......................................................................................... 22

8.2 Test philosophy for equipment intended for use in safety-related systems ............ 22

8.3 Test philosophy for safety-related systems ........................................................... 23

8.4 Test configuration and test performance ............................................................... 23

8.5 Monitoring ............................................................................................................. 24

9 Test results and test report ............................................................................................ 24

Annex A (informative) Approaches on how to apply IEC 61326-3 series ............................... 27

Annex B (informative) Evaluation of electromagnetic phenomena ........................................ 30

Annex C (informative) Allowed effects during immunity tests ................................................ 34

Bibliography .......................................................................................................................... 39

Figure 1 – Typical test set-up for equipment intended for use in safety-related system,

tested as stand-alone equipment or entire system ................................................................ 25

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SIST EN 61326-3-1:2017
IEC 61326-3-1:2017 © IEC 2017 – 3 –

Figure 2 – Typical test set-up for equipment intended for use in a safety-related system

integrated into a representative safety-related system during test ......................................... 26

Figure A.1 – Correlation between the standards IEC 61326-1, IEC 61326-2-x,

IEC 61326-3-1 and IEC 61326-3-2 ........................................................................................ 29

Figure B.1 – Emission/immunity levels and compatibility level, with an example of

emission/immunity levels for a single emitter and susceptor, as a function of some

independent variables (see IEC TR 61000-1-1) ..................................................................... 31

Table 1 – Reaction of EUT during test .................................................................................. 16

Table 2 – Immunity test requirements – Enclosure port ......................................................... 17

Table 3 – Immunity test requirements – Input and output AC power ports ............................. 18

Table 4 – Immunity test requirements – Input and output DC power ports ............................. 19

Table 5 – Immunity test requirements – I/O signal/control ports ............................................ 19

Table 6 – Immunity test requirements – I/O signal/control ports connected direct to

power supply networks.......................................................................................................... 20

Table 7 – Immunity test requirements – Functional earth port ............................................... 20

Table 8 – Frequency ranges of mobile transmitters and ISM equipment for tests with

electromagnetic fields ........................................................................................................... 21

Table 9 – Frequency ranges of mobile transmitters and ISM equipment for the

conducted RF tests ............................................................................................................... 22

Table 10 – Applicable performance criteria and observed behaviour during test for

equipment intended for use in safety-related systems ........................................................... 23

Table B.1 – Exemplary considerations on electromagnetic phenomena and test levels

with regard to functional safety in industrial applications ....................................................... 33

Table C.1 – Allowed effects during immunity tests on functions of equipment ....................... 35

Table C.2 – Allowed effects during immunity tests on functions of a system .......................... 37

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SIST EN 61326-3-1:2017
– 4 – IEC 61326-3-1:2017 © IEC 2017
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTRICAL EQUIPMENT FOR MEASUREMENT, CONTROL
AND LABORATORY USE – EMC REQUIREMENTS –
Part 3-1: Immunity requirements for safety-related systems and
for equipment intended to perform safety-related functions
(functional safety) – General industrial applications
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 61326-3-1 has been prepared by subcommittee 65A: System

aspects, of IEC technical committee 65: Industrial-process measurement, control and

automation.

This second edition cancels and replaces the first edition published in 2008. This edition

constitutes a technical revision. This edition includes the following significant technical

changes with respect to the previous edition:

• extension of the frequency range up to 6 GHz for the radio-frequency electromagnetic field

test according to IEC 61000-4-3,

• replacement of the performance criterion FS with DS according to the generic standard

IEC 61000-6-7,

• adding Table 1 – Aspects to be considered during application of performance criterion DS,

---------------------- Page: 12 ----------------------
SIST EN 61326-3-1:2017
IEC 61326-3-1:2017 © IEC 2017 – 5 –

• including immunity tests for devices with current consumption > 16 A according to

IEC 61000-4-34,
• updating Table 8 – Frequency ranges of mobile transmitters and ISM equipment,
• updating Figure A.1 and Figure 1 for better readability.
IEC 61326-3-1 is to be read in conjunction with IEC 61326-1.
The text of this standard is based on the following documents:
FDIS Report on voting
65A/819/FDIS 65A/825/RVD

Full information on the voting for the approval of this standard 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.

A list of all the parts of the IEC 61326 series, under the general title Electrical equipment for

measurement, control and laboratory use – EMC requirements, can be found on the IEC

website.

The committee has decided that the contents of this publication will remain unchanged until

the stability date indicated on the IEC website 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.

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 document using a

colour printer.
---------------------- Page: 13 ----------------------
SIST EN 61326-3-1:2017
– 6 – IEC 61326-3-1:2017 © IEC 2017
INTRODUCTION

Functional safety is that part of the overall safety relating to the equipment under control

(EUC) and the EUC control system which depends on the correct functioning of the electrical

safety-related systems. To achieve this, all items of equipment of the safety-related system

which are involved in the performance of the safety functions must behave in a specified

manner under all relevant conditions.

The IEC basic safety publication for functional safety of electrical/electronic/programmable

electronic safety-related systems is IEC 61508. It sets the overall requirements to achieve

functional safety. Sufficient immunity to electromagnetic disturbances is one of those

requirements.

The concept of IEC 61508 distinguishes between the consideration of the application and the

design of safety-related electrical and electronic systems. The overall safety requirements

specification specifies all relevant requirements of the intended application, as follows:

a) definition of the safety functions, based on a risk assessment of the intended application

(which functions are intended to reduce risk);

b) appropriate safety integrity level (SIL) for each safety-function based on a risk assessment

of the intended application;

c) definition of the environment in which the system is intended to work including the

electromagnetic environment as required by IEC 61508-2.

The requirements for each safety function are then specified in one or more system safety

requirements specifications (SSRS). Hence, with regard to immunity against electromagnetic

phenomena, the essential starting point is that the electromagnetic environment and its

phenomena are considered in the SSRS, as required by IEC 61508. The safety-related

system intended to implement the specified safety function has to fulfil the SSRS, and, from it,

corresponding immunity requirements have to be derived for the items of equipment, which

results in an equipment requirement specification. With respect to the electromagnetic

environment, the SSRS and the equipment requirement specification should be based on a

competent assessment of the foreseeable electromagnetic threats in the real environment

over the whole operational life of the equipment. Hence, immunity requirements for the

equipment depend on the characteristics of the electromagnetic environment in which the

equipment is intended to be used.

The equipment manufacturer, therefore, has to prove that the equipment fulfils the equipment

requirement specification and the system integrator must prove that the system fulfils the

SSRS. Evidence has to be produced by application of appropriate methods. They do not need

to consider any other aspects of the application, for example, risk of the application

associated to any failure of the safety-related system. The objective is for all equipment in the

system to comply with particular performance criteria taking into account functional safety

aspects (for example, the performance criterion DS) up to levels specified in the SSRS

independent of the required safety integrity level (SIL).
For approaches on how to apply IEC 61326-3 series, see Annex A.

There exists meanwhile the generic EMC standard IEC 61000-6-7 dealing with functional

safety aspects in industrial environments. Generic EMC standards are designed to apply for a

defined electromagnetic environment, to products for which no dedicated product family

EMC/product EMC standards exist. However, for the equipment in the scope of this document,

the information given in the generic EMC standard was considered not to be sufficient. More

detailed information and specifications were needed, for example specific test set-ups,

consideration of the functional earth port or the deliberate differentiation between types of

electromagnetic environments relevant for the equipment in the scope of this document.

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