IEC 61326-3-1:2017
(Main)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
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 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.
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,
- 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.
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
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.
General Information
Relations
Overview
IEC 61326-3-1:2017 specifies electromagnetic immunity (EMC) requirements for electrical equipment and systems used in measurement, control and laboratory applications that are intended to perform safety-related functions (functional safety) in general industrial environments. It applies to devices and systems within the scope of IEC 61326-1 but is limited to equipment intended to meet functional-safety requirements as defined by IEC 61508 for SIL 1–3. This second edition (2017) is a technical revision and must be read in conjunction with IEC 61326-1.
Key topics and technical requirements
- Scope and relationship with IEC 61326-1 and IEC 61508 (functional safety requirements for SIL 1–3).
- Immunity test planning: configuration of equipment under test (EUT), auxiliary equipment, cabling, grounding and operation modes during testing.
- Performance criteria: replacement of criterion FS by DS (degraded/safe state) in line with IEC 61000-6-7; includes guidance on applying DS and Table 1 (aspects to consider).
- Electromagnetic field tests: radio-frequency immunity extended up to 6 GHz per IEC 61000-4-3.
- Conducted and power-port immunity: tests for AC/DC supply ports, I/O and functional earth ports; special attention for devices with current consumption > 16 A using IEC 61000-4-34.
- Test philosophy for safety systems: guidance for testing stand-alone equipment versus equipment integrated into representative safety-related systems, monitoring and permitted behaviour during disturbances.
- Test documentation: required test reports and evaluation of observed behaviour, including informative annexes on application approaches and allowed effects.
Practical applications and users
IEC 61326-3-1 is directly useful for:
- Manufacturers of measurement, control and laboratory equipment that implement safety functions (design, EMC engineering, product compliance).
- System integrators and automation engineers developing safety-related systems (SIL 1–3) for industrial plants.
- EMC test laboratories and conformity assessment bodies performing immunity testing and reporting for functional-safety equipment.
- Functional-safety engineers and compliance officers seeking to demonstrate that electromagnetic disturbances do not compromise safety functions.
Practical benefits include clearer test setups for safety-related devices, harmonized use of performance criterion DS, and updated RF test coverage (to 6 GHz) to reflect modern wireless and ISM sources.
Related standards
- IEC 61326-1 (general EMC requirements for measurement, control and laboratory equipment)
- IEC 61508 (functional safety of E/E/PE safety-related systems)
- IEC 61000-4-3 (RF immunity test methods)
- IEC 61000-6-7 (generic standard for industrial immunity - introduces DS)
- IEC 61000-4-34 (tests for equipment with high current consumption)
Keywords: IEC 61326-3-1, EMC immunity, functional safety, safety-related systems, IEC 61508, SIL 1–3, RF immunity 6 GHz, IEC 61000-4-3, performance criterion DS.
Frequently Asked Questions
IEC 61326-3-1:2017 is a standard published by the International Electrotechnical Commission (IEC). Its full title is "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". This standard covers: IEC 61326-3-1:2017 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. 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, - 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 61326-3-1:2017 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. 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, - 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 61326-3-1:2017 is classified under the following ICS (International Classification for Standards) categories: 25.040.40 - Industrial process measurement and control; 33.100.20 - Immunity. The ICS classification helps identify the subject area and facilitates finding related standards.
IEC 61326-3-1:2017 has the following relationships with other standards: It is inter standard links to IEC 61326-3-1:2008/COR1:2008, IEC 61326-3-1:2008. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
You can purchase IEC 61326-3-1:2017 directly from iTeh Standards. The document is available in PDF format and is delivered instantly after payment. Add the standard to your cart and complete the secure checkout process. iTeh Standards is an authorized distributor of IEC standards.
Standards Content (Sample)
IEC 61326-3-1 ®
Edition 2.0 2017-05
REDLINE VERSION
INTERNATIONAL
STANDARD
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
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IEC 61326-3-1 ®
Edition 2.0 2017-05
REDLINE VERSION
INTERNATIONAL
STANDARD
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
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 25.040.40; 33.100.20 ISBN 978-2-8322-4356-5
– 2 – IEC 61326-3-1:2017 RLV © IEC 2017
CONTENTS
FOREWORD . 4
INTRODUCTION . 2
1 Scope . 8
2 Normative references . 8
3 Terms, definitions and abbreviations . 10
3.1 Terms and definitions . 10
3.2 Abbreviations . 10
4 General . 13
5 EMC test plan . 14
5.1 General . 14
5.2 Instruction for testing . 14
5.3 Configuration of EUT during testing . 15
5.3.1 General . 15
5.3.2 Composition of EUT . 15
5.3.3 Assembly of EUT . 15
5.3.4 I/O ports . 15
5.3.5 Auxiliary equipment (AE) . 15
5.3.6 Cabling and earthing (grounding) . 15
5.4 Operation conditions of EUT during testing . 16
5.4.1 Operation modes . 16
5.4.2 Environmental conditions . 16
5.4.3 EUT software during test . 16
5.5 Specification of performance criteria . 16
5.6 Test description . 16
6 Performance criteria . 16
6.1 Performance criterion FS DS . 16
6.2 Application of the performance criterion FS DS . 16
6.3 Aspects to be considered during application of performance criterion DS . 17
7 Immunity requirements . 18
8 Test set-up and test philosophy for EUTs with functions intended for safety
applications . 26
8.1 Testing of safety-related systems and equipment intended to be used in
safety-related systems . 26
8.2 Test philosophy for equipment intended for use in safety-related systems . 26
8.3 Test philosophy for safety-related systems . 27
8.4 Test configuration and test performance . 27
8.5 Monitoring . 27
9 Test results and test report . 29
Annex A (informative) Approaches on how to apply IEC 61326-3 series . 35
Annex B (informative) Evaluation of electromagnetic phenomena . 37
Annex C (informative) Allowed effects during immunity tests . 41
Bibliography . 46
Figure 1 – Typical test set-up for equipment intended for use in safety-related system,
tested as stand-alone equipment or entire system . 30
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 . 32
Figure 3 – Typical test set-up for equipment intended for use in safety-related system
tested stand-alone .
Figure 4 – Typical test set-up for a safety-related system .
Figure A.1 – Correlation between the standards IEC 61326-1, IEC 61326-2-x,
IEC 61326-3-1 and IEC 61326-3-2 . 36
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) . 38
Table 1 – Reaction of EUT during test . 18
Table 2 – Selected frequencies for electromagnetic field tests .
Table 2 – Immunity test requirements for equipment intended for use in industrial –
Enclosure port . 19
Table 3 – Immunity test requirements for equipment intended for use in industrial –
Input and output AC power ports . 20
Table 4 – Immunity test requirements for equipment intended for use in industrial –
Input and output DC power ports. 21
Table 5 – Immunity test requirements for equipment intended for use in industrial – I/O
signal/control ports . 22
Table 6 – Immunity test requirements for equipment intended for use in industrial – I/O
signal/control ports connected direct to power supply networks. 23
Table 7– Immunity test requirements for equipment intended for use in industrial –
Functional earth port . 23
Table 8 – Frequency ranges of mobile transmitters and ISM equipment for tests with
electromagnetic fields . 25
Table 9 – Selected Frequency ranges of mobile transmitters and ISM equipment for
the conducted RF tests . 26
Table 10 – Applicable performance criteria and observed behaviour during test for
equipment intended for use in safety-related systems . 27
Table B.1 – Exemplary considerations on electromagnetic phenomena and test levels
with regard to functional safety in industrial applications . 40
Table C.1 – Allowed effects during immunity tests on functions of equipment (1 of 2) . 42
Table C.2 – Allowed effects during immunity tests on functions of a system (1 of 2). 44
– 4 – IEC 61326-3-1:2017 RLV © 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
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
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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.
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,
• 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.
– 6 – IEC 61326-3-1:2017 RLV © 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 interface between both is The
overall safety requirements specification (SRS). It 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 FS 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.
Though historically this product standard was developed several years before the generic
nd
EMC standard, this 2 edition considers the information given in the generic EMC standard
and applies it where appropriate.
– 8 – IEC 61326-3-1:2017 RLV © IEC 2017
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
1 Scope
This part of IEC 61326 covers all equipment within the scope of IEC 61326-1 applies to this
part of IEC 61326, 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.
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 60050-161, International Electrotechnical Vocabulary – Part 161: Electromagnetic
compatibility (available at
IEC 61000-4-2:2001 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 61000-4-4:2004 2012, Electromagnetic compatibility (EMC) – Part 4-4: Testing and
measurement techniques – Electrical fast transient/burst immunity test
IEC 61000-4-5:2005 2014, Electromagnetic compatibility (EMC) – Part 4-5: Testing and
measurement techniques – Surge immunity test
IEC 61000-4-6:2004 2013, Electromagnetic compatibility (EMC) – Part 4-6: Testing and
measurement techniques – Immunity to conducted disturbances, induced by radio-frequency
fields
IEC 61000-4-8:1993 2009, Electromagnetic compatibility (EMC) – Part 4-8: Testing and
measurement techniques – Power frequency magnetic field immunity test
Amendment 1 (2000)
IEC 61000-4-11:2004, Electromagnetic compatibility (EMC) – Part 4-11: Testing and
measurement techniques – Voltage dips, short interruptions and voltage variations immunity
tests
IEC 61000-4-16:1998 2015, Electromagnetic compatibility (EMC) – Part 4-16: Testing and
measurement techniques – Test for immunity to conducted, common mode disturbances in
the frequency range 0 Hz to 150 kHz
Amendment 1 (2001)
IEC 61000-4-29:2000, Electromagnetic compatibility (EMC) – Part 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) – Part 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
IEC 61000-4-34:2005/AMD1:2009
IEC 61000-6-2:2005 2016, Electromagnetic compatibility (EMC) – Part 6-2: Generic standards
– Immunity for industrial environments
IEC 61326-1:2005 2012, Electrical equipment for measurement, control and laboratory use –
EMC requirements – Part 1: General requirements
IEC 61326-2-1:2005, Electrical equipment for measurement, control and laboratory use –
EMC requirements – Part 2-1: Particular requirements – Test configurations, operational
conditions and performance criteria for sensitive test and measurement equipment for EMC
unprotected applications
IEC 61326-2-2:2005, Electrical equipment for measurement, control and laboratory use –
EMC requirements – Part 2-2: Particular requirements – Test configurations, operational
conditions and performance criteria for portable test, measuring and monitoring equipment
used in low-voltage distribution systems
IEC 61326-2-3:2006, Electrical equipment for measurement, control and laboratory use –
EMC requirements – Part 2-3: Particular requirements – Test configurations, operational
conditions and performance criteria for transducers with integrated or remote signal
conditioning
IEC 61326-2-4:2006, Electrical equipment for measurement, control and laboratory use –
EMC requirements – Part 2-4: Particular requirements – Test configurations, operational
conditions and performance criteria for insulation monitoring devices according to IEC 61557-
8 and for equipment for insulation fault location according to IEC 61557-9
IEC 61326-2-5:2006, Electrical equipment for measurement, control and laboratory use –
EMC requirements – Part 2-5: Particular requirements – Test configurations, operational
conditions and performance criteria for field devices with interfaces according to IEC 61784-1,
CP 3/2
IEC 61326-3-2:2008___ , Electrical equipment for measurement, control and laboratory use
– EMC requirements – Part 3-2: Immunity requirements for safety-related systems and for
_____________
There exists a consolidated edition 1.1 (2001) that includes edition 1.0 and its amendment.
– 10 – IEC 61326-3-1:2017 RLV © IEC 2017
equipment intended to perform safety-related functions (functional safety) – Industrial
applications with specified EM electromagnetic environment
IEC 61508-2:2000 2010, Functional safety of electrical/electronic/programmable electronic
safety-related systems – Part 2: Requirements for electrical/electronic/programmable
electronic safety-related systems
ISO/IEC Guide 51:1999, Safety aspects – Guidelines for their inclusion in standards
3 Terms, definitions and abbreviations
3.1 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 61326-1 and
IEC 60050-161 and the following 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
NOTE Other definitions, not included in IEC 60050-161 and in this document, but nevertheless necessary for the
application of the different tests, are given in the EMC basic publications of the IEC 61000 series.
3.1.1
dangerous failure
failure which has the potential to put the safety-related system in a hazardous or fail-to-
function state of an element and/or subsystem and/or system that plays a part in
implementing the safety function that:
a) prevents a safety function from operating when required (demand mode) or causes a
safety function to fail (continuous mode) such that the EUC is put into a hazardous or
potentially hazardous state; or
b) decreases the probability that the safety function operates correctly when required
NOTE Whether or not the potential is realised may depend on the channel architecture of the system; in systems
with multiple channels to improve safety, a dangerous hardware failure is less likely to lead to the overall
dangerous or fail-to-function state.
[SOURCE: IEC 61508-4:2010, 3.6.7]
3.1.2
equipment
the term equipment as used in this document is extremely general and is applied to a wide
variety of possible subsystems, apparatus, appliances and other assemblies of products
3.1.3
equipment under control
EUC
equipment, machinery, apparatus or plant used for manufacturing, process, transportation,
medical or other activities
Note 1 to entry: The EUC control system is separate and distinct from the EUC.
[SOURCE: IEC 61508-4:2010, 3.2.1]
Under preparation. Stage at the time of publication: IEC/DIS 61326-3-2:2016.
3.1.4
functional safety
part of the overall safety relating to the EUC and the EUC control system that depends on the
correct functioning of the E/E/PE safety-related systems, other technology safety-related
systems and external risk reduction facilities and other risk reduction measures
[SOURCE: IEC 61508-4:2010, 3.1.12]
3.1.5
harm
physical injury or damage to the health of people, or damage to property or the environment
[SOURCE: ISO/IEC Guide 51:2014, 3.1, modified – "physical" has been added]
3.1.6
hazard
potential source of harm
Note 1 to entry: The term includes short-term or immediate danger to persons arising within a short time scale
(such as from fire or explosion) and also those that have a long-term effects on a person’s health (such as from
release of a toxic substance).
[SOURCE: ISO/IEC Guide 51:2014, 3.2, modified – the note to entry has been added]
3.1.7
safe failure
failure which does not have the potential to put the safety-related system in a hazardous or
fail-to-function state of an element and/or subsystem and/or system that plays a part in
implementing the safety function that:
a) results in the spurious operation of the safety function to put the EUC (or part thereof) into
a safe state or maintain a safe state; or
b) increases the probability of the spurious operation of the safety function to put the EUC (or
part thereof) into a safe state or maintain a safe state
NOTE Whether or not the potential is realised may depend on the channel architecture of the system; in systems
with multiple channels to improve safety, a safe hardware failure is less likely to result in an erroneous shut-down.
[SOURCE: IEC 61508-4:2010, 3.6.8]
3.1.8
safety function
function to be implemented by an E/E/PE safety-related system, other technology safety-
related system or external risk reduction facilities or other risk reduction measures, that is
intended to achieve or maintain a safe state for the EUC, in respect of a specific hazardous
event (see 3.4.1)
EXAMPLE Examples of safety functions include:
– functions that are required to be carried out as positive actions to avoid hazardous situations (for example
switching off a motor); and
– functions that prevent actions being taken (for example preventing a motor starting).
[SOURCE: IEC 61508-4:2010, 3.5.1]
3.1.9
programmable electronic
PE
based on computer technology which may be comprised of hardware, software and of input
and/or output units
– 12 – IEC 61326-3-1:2017 RLV © IEC 2017
EXAMPLE The following are all programmable electronic devices:
– microprocessors;
– micro-controllers;
– programmable controllers;
– application specific integrated circuits (ASICs);
– programmable logic controllers (PLCs);
– other computer-based devices (for example, smart sensors, transmitters, actuators).
Note 1 to entry: This term covers microelectronic devices based on one or more central processing units (CPUs)
together with associated memories, etc.
[SOURCE: IEC 61508-4:2010, 3.2.12]
3.1.10
electrical/electronic/programmable electronic
E/E/PE
based on electrical (E) and/or electronic (E) and/or programmable electronic (PE) technology
EXAMPLE Electrical/electronic/programmable electronic devices include
– electro-mechanical devices (electrical);
– solid-state non-programmable electronic devices (electronic);
– electronic devices based on computer technology (programmable electronic);
see 3.2.5 (of IEC 61326-1:2012).
Note 1 to entry: The term is intended to cover any and all devices or systems operating on electrical principles.
[SOURCE: IEC 61508-4:2010, 3.2.13, modified – the reference in the last dash is modified]
3.1.11
DC distribution network
local DC electricity supply network in the infrastructure of a certain site or building intended
for connection of any type of equipment
Note 1 to entry: Connection to a local or remote battery is not regarded as a DC distribution network if such a link
comprises only the power supply for only a single piece of equipment.
3.1.12
system (in the context of this document)
combination of apparatus and/or active components constituting a single functional unit and
intended to be installed and operated to perform (a) specific task(s)
NOTE "Safety-related systems" are specifically "designed" equipment that both
– implement the required safety functions necessary to achieve or maintain a safe state for a controlled
equipment;
– are intended to achieve on their own or with other safety-related equipment or external risk reduction facilities,
the necessary safety integrity for the safety requirements.
[IEC 61508-4, 3.4.1, modified]
3.1.12
safety-related system
designated system that both
• implements the required safety functions necessary to achieve or maintain a safe state for
the EUC; and
• is intended to achieve, on its own or with other E/E/PE safety-related systems and other
risk reduction measures, the necessary safety integrity for the required safety functions
Note 1 to entry: A safety-related system includes all the hardware, software and supporting services (for example,
power supplies) necessary to carry out the specified safety function (sensors, other input devices, final elements
(actuators) and other output devices are therefore included in the safety-related system).
[SOURCE: IEC 61508-4:2010, 3.4.1, modified – notes 1, 2, 3, 4, 5 and 7 have been removed]
3.1.13
equipment under test
EUT
the equipment (devices, appliances and systems) subjected to immunity tests
3.1.14
auxiliary equipment
AE
equipment necessary to provide the equipment under test (EUT) with the signals required for
normal operation and equipment to verify the performance of the EUT
3.1.15
system safety requirements specification
SSRS
specification containing the requirements for the safety functions and their associated safety
integrity levels
3.1.16
safety integrity level
SIL
discrete level (one out of a possible four), corresponding to a range of safety integrity values,
where safety integrity level 4 has the highest level of safety integrity and safety integrity
level 1 has the lowest
Note 1 to entry: The target failure measures for the four safety integrity levels are specified in Tables 2 and 3 of
IEC 61508-1:2010.
Note 2 to entry: Safety integrity levels are used for specifying the safety integrity requirements of the safety
functions to be allocated to the E/E/PE safety-related systems.
Note 3 to entry: A safety integrity level (SIL) is not a property of a system, subsystem, element or component.
The correct interpretation of the phrase “SIL n safety-related system” (where n is 1, 2, 3 or 4) is that the system is
potentially capable of supporting safety functions with a safety integrity level up to n.
[SOURCE: IEC 61508-4:2010, 3.5.8, modified – the reference to 3.5.17 of IEC 61508-1 has
been removed and its date of publication added]
3.2 Abbreviations
AE auxiliary equipment
DS defined state
E/E/PE electrical/electronic/programmable electronic
EUC equipment under control
EUT equipment under test
ISM industrial, scientific and medical
PE protective earth
SIL safety integrity level
SSRS system safety requirements specification
4 General
In addition to the requirements in IEC 61326-1, this standard specifies additional
requirements for systems and equipment for industrial applications intended to perform safety
– 14 – IEC 61326-3-1:2017 RLV © IEC 2017
functions according to IEC 61508. These additional requirements do not apply to the non-
safety-related functions of the equipment or systems.
NOTE 1 The overall design process and the necessary design features to achieve functional safety of electrical
and electronic systems are defined in IEC 61508. This includes requirements for design features that make the
system tolerant (IEC 61508-2:2000 2010, 7.4.7.1) of electromagnetic disturbances.
The immunity requirements in IEC 61326-1 have been selected to ensure an adequate level of
immunity for equipment used in non-safety-related applications, but the required immunity
levels do not cover extreme cases that may occur at any location but with an extremely low
probability of occurrence.
The possibility of occurrence of higher disturbance levels is not considered in IEC 61326-1
and it is also not considered on a statistical basis. Therefore, Increased immunity test levels
compared to IEC 61326-1 are defined as a systematic measure intended to avoid dangerous
failures caused by electromagnetic phenomena. Consequently, it is not necessary to take into
account the effect of electromagnetic phenomena in the quantification of hardware safety
integrity, for example, probability of failure on demand. Increased immunity test levels are
defined phenomenon by phenomenon where necessary.
Increased immunity test levels are related to functional safety aspects only; they are not
applicable for the assessment of reliability and availability aspects. The increased immunity
test levels apply only to the safety-related functions having a specific performance criterion
for functional safety (performance criterion FS DS). The increased immunity test levels set the
limits for the maximum test values. Further tests with higher values are not required for
compliance with this standard.
NOTE 2 The safety-related system intended to implement the specified function should fulfil the SRS as required
in IEC 61508. The SRS specifies all relevant requirements of the intended application. Equipment intended for use
in that system has to fulfil the relevant requirements derived from the SRS.
5 EMC test plan
5.1 General
An EMC test plan shall be established prior to testing. It shall contain as a minimum the
elements given in 5.2 to 5.6.
It may be determined from consideration of the electrical characteristics and usage of a
particular apparatus that some tests are inappropriate and therefore unnecessary. In such
cases the decision not to test shall be recorded in the EMC test plan.
If any tests are deemed unnecessary to prove compliance with this standard, the rationale for
not performing those tests shall be documented in the EMC test plan.
5.2 Instruction for testing
The instructions for testing immunity in case of safety-functions shall be detailed and
unambiguous. Hence all relevant details when performing such a series of immunity tests
shall be described in the test plan. Such a test plan shall contain at least information about
• input and output ports relevant for immunity testing,
• configuration of the EUT including any necessary auxiliary and monitoring equipment,
• operation mode of safety functions,
• levels for the immunity test,
• specified performance criteria including the defined state(s),
• monitoring of the behaviour of the EUT,
• assessment of the reaction of the EUT against the manufacturers’ specified performance
criteria.
5.3 Configuration of EUT during testing
5.3.1 General
Measurement, control and laboratory equipment often consists of systems with no fixed
configuration. The kind, number and installation of different subassemblies within the equip-
ment may vary from system to system.
To simulate EMC conditions realistically, the equipment assembly shall represent a typical
installation as specified by the manufacturer. EMC tests shall be carried out as type tests
under normal conditions as specified by the manufacturer.
In some cases auxiliary set-ups are necessary to monitor the proper operation of the safety
function when electromagnetic disturbances act on the EUT.
5.3.2 Composition of EUT
All devices, racks, modules, boards, etc. which are potentially relevant to EMC and belonging
to the EUT shall be documented. The rationale for the composition of the EUT selected for
testing shall be documented in the EMC test plan.
5.3.3 Assembly of EUT
If an EUT has a variety of internal or external configurations, the type tests shall be made with
the most susceptible configuration, as expected by the manufacturer. All types of modules
shall be tested at least once. The rationale for this selection shall be documented in the EMC
test plan. The possibility of any electromagnetic interacti
...
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
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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
– 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
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
– 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
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
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,
• 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.
– 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.
Though historically this product standard was developed several years before the generic
nd
EMC standard, this 2 edition considers the information given in the generic EMC standard
and applies it where appropriate.
– 8 – IEC 61326-3-1:2017 © IEC 2017
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
1 Scope
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.
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 60050-161, International Electrotechnical Vocabulary – Part 161: Electromagnetic
compatibility (available at
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 61000-4-6:2013, Electromagnetic compatibility (EMC) – Part 4-6: Testing and
measurement techniques – Immunity to conducted disturbances, induced by radio-frequency
fields
IEC 61000-4-8:2009, Electromagnetic compatibility (EMC) – Part 4-8: Testing and
measurement techniques – Power frequency magnetic field immunity test
IEC 61000-4-11:2004, Electromagnetic compatibility (EMC) – Part 4-11: Testing and
measurement techniques – Voltage dips, short interruptions and voltage variations immunity
tests
IEC 61000-4-16:2015, Electromagnetic compatibility (EMC) – Part 4-16: Testing and
measurement techniques – Test for immunity to conducted, common mode disturbances in
the frequency range 0 Hz to 150 kHz
IEC 61000-4-29:2000, Electromagnetic compatibility (EMC) – Part 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) – Part 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
IEC 61000-4-34:2005/AMD1:2009
IEC 61000-6-2:2016, Electromagnetic compatibility (EMC) – Part 6-2: Generic standards –
Immunity for industrial environments
IEC 61326-1:2012, Electrical equipment for measurement, control and laboratory use – EMC
requirements – Part 1: General requirements
IEC 61326-3-2:___ , Electrical equipment for measurement, control and laboratory use –
EMC requirements – Part 3-2: Immunity requirements for safety-related systems and for
equipment intended to perform safety-related functions (functional safety) – Industrial
applications with specified electromagnetic environment
IEC 61508-2:2010, Functional safety of electrical/electronic/programmable electronic safety-
related systems – Part 2: Requirements for electrical/electronic/programmable electronic
safety-related systems
3 Terms, definitions and abbreviations
3.1 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 61326-1 and
IEC 60050-161 and the following 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
NOTE Other definitions, not included in IEC 60050-161 and in this document, but nevertheless necessary for the
application of the different tests, are given in the EMC basic publications of the IEC 61000 series.
3.1.1
dangerous failure
failure of an element and/or subsystem and/or system that plays a part in implementing the
safety function that:
_____________
Under preparation. Stage at the time of publication: IEC/DIS 61326-3-2:2016.
– 10 – IEC 61326-3-1:2017 © IEC 2017
a) prevents a safety function from operating when required (demand mode) or causes a
safety function to fail (continuous mode) such that the EUC is put into a hazardous or
potentially hazardous state; or
b) decreases the probability that the safety function operates correctly when required
[SOURCE: IEC 61508-4:2010, 3.6.7]
3.1.2
equipment
subsystems, apparatus, appliances and other assemblies of products
3.1.3
equipment under control
EUC
equipment, machinery, apparatus or plant used for manufacturing, process, transportation,
medical or other activities
Note 1 to entry: The EUC control system is separate and distinct from the EUC.
[SOURCE: IEC 61508-4:2010, 3.2.1]
3.1.4
functional safety
part of the overall safety relating to the EUC and the EUC control system that depends on the
correct functioning of the E/E/PE safety-related systems and other risk reduction measures
[SOURCE: IEC 61508-4:2010, 3.1.12]
3.1.5
harm
physical injury or damage to the health of people, or damage to property or the environment
[SOURCE: ISO/IEC Guide 51:2014, 3.1, modified – "physical" has been added]
3.1.6
hazard
potential source of harm
Note 1 to entry: The term includes short-term or immediate danger (such as from fire or explosion) and long-term
effects on health (such as from release of a toxic substance).
[SOURCE: ISO/IEC Guide 51:2014, 3.2, modified – the note to entry has been added]
3.1.7
safe failure
failure of an element and/or subsystem and/or system that plays a part in implementing the
safety function that:
a) results in the spurious operation of the safety function to put the EUC (or part thereof) into
a safe state or maintain a safe state; or
b) increases the probability of the spurious operation of the safety function to put the EUC (or
part thereof) into a safe state or maintain a safe state
[SOURCE: IEC 61508-4:2010, 3.6.8]
3.1.8
safety function
function to be implemented by an E/E/PE safety-related system or other risk reduction
measures, that is intended to achieve or maintain a safe state for the EUC, in respect of a
specific hazardous event
EXAMPLE Examples of safety functions include:
– functions that are required to be carried out as positive actions to avoid hazardous situations (for example
switching off a motor); and
– functions that prevent actions being taken (for example preventing a motor starting).
[SOURCE: IEC 61508-4:2010, 3.5.1]
3.1.9
programmable electronic
PE
based on computer technology which may be comprised of hardware, software and of input
and/or output units
EXAMPLE The following are all programmable electronic devices:
– microprocessors;
– micro-controllers;
– programmable controllers;
– application specific integrated circuits (ASICs);
– programmable logic controllers (PLCs);
– other computer-based devices (for example, smart sensors, transmitters, actuators).
Note 1 to entry: This term covers microelectronic devices based on one or more central processing units (CPUs)
together with associated memories, etc.
[SOURCE: IEC 61508-4:2010, 3.2.12]
3.1.10
electrical/electronic/programmable electronic
E/E/PE
based on electrical (E) and/or electronic (E) and/or programmable electronic (PE) technology
EXAMPLE Electrical/electronic/programmable electronic devices include
– electro-mechanical devices (electrical);
– solid-state non-programmable electronic devices (electronic);
– electronic devices based on computer technology (programmable electronic); see 3.2.5
(of IEC 61326-1:2012).
Note 1 to entry: The term is intended to cover any and all devices or systems operating on electrical principles.
[SOURCE: IEC 61508-4:2010, 3.2.13, modified – the reference in the last dash is modified]
3.1.11
DC distribution network
local DC electricity supply network in the infrastructure of a certain site or building intended
for connection of any type of equipment
Note 1 to entry: Connection to a local or remote battery is not regarded as a DC distribution network if such a link
comprises the power supply for only a single piece of equipment.
3.1.12
safety-related system
designated system that both
– 12 – IEC 61326-3-1:2017 © IEC 2017
• implements the required safety functions necessary to achieve or maintain a safe state for
the EUC; and
• is intended to achieve, on its own or with other E/E/PE safety-related systems and other
risk reduction measures, the necessary safety integrity for the required safety functions
Note 1 to entry: A safety-related system includes all the hardware, software and supporting services (for example,
power supplies) necessary to carry out the specified safety function (sensors, other input devices, final elements
(actuators) and other output devices are therefore included in the safety-related system).
[SOURCE: IEC 61508-4:2010, 3.4.1, modified – notes 1, 2, 3, 4, 5 and 7 have been removed]
3.1.13
equipment under test
EUT
the equipment (devices, appliances and systems) subjected to immunity tests
3.1.14
auxiliary equipment
AE
equipment necessary to provide the equipment under test (EUT) with the signals required for
normal operation and equipment to verify the performance of the EUT
3.1.15
system safety requirements specification
SSRS
specification containing the requirements for the safety functions and their associated safety
integrity levels
3.1.16
safety integrity level
SIL
discrete level (one out of a possible four), corresponding to a range of safety integrity values,
where safety integrity level 4 has the highest level of safety integrity and safety integrity
level 1 has the lowest
Note 1 to entry: The target failure measures for the four safety integrity levels are specified in Tables 2 and 3 of
IEC 61508-1:2010.
Note 2 to entry: Safety integrity levels are used for specifying the safety integrity requirements of the safety
functions to be allocated to the E/E/PE safety-related systems.
Note 3 to entry: A safety integrity level (SIL) is not a property of a system, subsystem, element or component.
The correct interpretation of the phrase “SIL n safety-related system” (where n is 1, 2, 3 or 4) is that the system is
potentially capable of supporting safety functions with a safety integrity level up to n.
[SOURCE: IEC 61508-4:2010, 3.5.8, modified – the reference to 3.5.17 of IEC 61508-1 has
been removed and its date of publication added]
3.2 Abbreviations
AE auxiliary equipment
DS defined state
E/E/PE electrical/electronic/programmable electronic
EUC equipment under control
EUT equipment under test
ISM industrial, scientific and medical
PE protective earth
SIL safety integrity level
SSRS system safety requirements specification
4 General
In addition to the requirements in IEC 61326-1, this standard specifies requirements for
systems and equipment for industrial applications intended to perform safety functions
according to IEC 61508. These requirements do not apply to the non-safety-related functions
of the equipment or systems.
NOTE The overall design process and the necessary design features to achieve functional safety of electrical and
electronic systems are defined in IEC 61508. This includes requirements for design features that make the system
tolerant (IEC 61508-2:2010, 7.4.7.1) of electromagnetic disturbances.
The immunity requirements in IEC 61326-1 have been selected to ensure an adequate level of
immunity for equipment used in non-safety-related applications, but the required immunity
levels do not cover extreme cases that may occur at any location but with an extremely low
probability of occurrence.
Increased immunity test levels compared to IEC 61326-1 are defined as a systematic measure
intended to avoid dangerous failures caused by electromagnetic phenomena. Consequently, it
is not necessary to take into account the effect of electromagnetic phenomena in the
quantification of hardware safety integrity, for example, probability of failure on demand.
Increased immunity test levels are defined where necessary.
Increased immunity test levels are related to functional safety aspects only; they are not
applicable for the assessment of reliability and availability aspects. The increased immunity
test levels apply only to the safety-related functions having a specific performance criterion
for functional safety (performance criterion DS). The increased immunity test levels set the
limits for the maximum test values. Further tests with higher values are not required for
compliance with this standard.
5 EMC test plan
5.1 General
An EMC test plan shall be established prior to testing. It shall contain as a minimum the
elements given in 5.2 to 5.6.
If any tests are deemed unnecessary to prove compliance with this standard, the rationale for
not performing those tests shall be documented in the EMC test plan.
5.2 Instruction for testing
The instructions for testing immunity in case of safety-functions shall be detailed and
unambiguous. Hence all relevant details when performing such a series of immunity tests
shall be described in the test plan. Such a test plan shall contain at least information about
• input and output ports relevant for immunity testing,
• configuration of the EUT including any necessary auxiliary and monitoring equipment,
• operation mode of safety functions,
• levels for the immunity test,
• specified performance criteria including the defined state(s),
• monitoring of the behaviour of the EUT,
• assessment of the reaction of the EUT against the manufacturers’ specified performance
criteria.
– 14 – IEC 61326-3-1:2017 © IEC 2017
5.3 Configuration of EUT during testing
5.3.1 General
Measurement, control and laboratory equipment often consists of systems with no fixed
configuration. The kind, number and installation of different subassemblies within the equip-
ment may vary from system to system.
To simulate EMC conditions realistically, the equipment assembly shall represent a typical
installation as specified by the manufacturer. EMC tests shall be carried out as type tests
under normal conditions as specified by the manufacturer.
In some cases auxiliary set-ups are necessary to monitor the proper operation of the safety
function when electromagnetic disturbances act on the EUT.
5.3.2 Composition of EUT
All devices, racks, modules, boards, etc. which are potentially relevant to EMC and belonging
to the EUT shall be documented. The rationale for the composition of the EUT selected for
testing shall be documented in the EMC test plan.
5.3.3 Assembly of EUT
If an EUT has a variety of internal or external configurations, the type tests shall be made with
the most susceptible configuration, as expected by the manufacturer. All types of modules
shall be tested at least once. The rationale for this selection shall be documented in the EMC
test plan. The possibility of any electromagnetic interactions between items of equipment shall
be taken into account when building up the most susceptible configuration. The rationale for
the assembly selected for testing shall be documented in the EMC test plan.
5.3.4 I/O ports
Where there are multiple I/O ports all of the same type and function, connecting a cable to
just one of those ports is sufficient, provided that it can be shown that the additional cables
would not affect the results significantly. The rationale for this selection shall be documented
in the EMC test plan.
5.3.5 Auxiliary equipment (AE)
When a variety of items of AE is provided for use with the EUT, at least one of each type of
item of AE shall be selected to simulate actual operating conditions. AE may be simulated.
Any software used by AE shall be documented sufficiently to allow repeating the test.
It is strongly recommended that the AE used is not susceptible to electromagnetic
disturbances, such as for example mechanical equipment, to ease detection and assessment
of the reaction of the EUT.
5.3.6 Cabling and earthing (grounding)
The cables and earth (ground) shall be connected to the EUT in accordance with the
manufacturer's specifications. There shall be no additional earth connections.
5.4 Operation conditions of EUT during testing
5.4.1 Operation modes
A selection of representative operation modes shall be made, taking into account that not all
functions, but only the most typical functions of the equipment can be tested. The estimated
worst-case operating modes within the specification of the equipment for the intended
application shall be selected.
NOTE Worst-case operating mode is for example the most susceptible mode of operation.
5.4.2 Environmental conditions
The tests shall be carried out within the manufacturer’s specified environmental operating
range (for example, ambient temperature, humidity, atmospheric pressure), and within the
rated ranges of supply voltage and frequency, except where the test requirements state
otherwise.
5.4.3 EUT software during test
The software used for exercising the selected modes of operation shall be documented
sufficiently to allow repeating the test.
5.5 Specification of performance criteria
Performance criteria for each port and test shall be specifie
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