IEC 61326-3-2:2017
(Main)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
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 61326-3-2:2017 covers all equipment within the scope of IEC 61326-1, but is limited to systems and equipment for industrial applications within a specified electromagnetic environment and 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 Figure A.1 and Figure 1 for better readability,
- adding tests according to IEC 61000-4-16 to replace the tests according to IEC 61000-4-6 in the frequency range between 10 kHz and 150 kHz.
Matériel électrique de mesure, de commande et de laboratoire - Exigences relatives à la CEM - Partie 3-2: 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 dont l'environnement électromagnétique est spécifié
L’IEC 61326-3-2:2017 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 dans un environnement électromagnétique spécifié et 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 fréquence radioélectrique, 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 de la Figure A.1 et de la Figure 1 pour une meilleure lisibilité,
- ajouts d’essais conformes à l’IEC 61000-4-16 afin de remplacer les essais conformes à l’IEC 61000-4-6 dans la plage de fréquences comprises entre 10 kHz et 150 kHz.
General Information
Relations
Overview
IEC 61326-3-2:2017 specifies EMC immunity requirements for electrical equipment used for measurement, control and laboratory use when those devices are intended to perform safety-related functions (functional safety) in industrial applications within a defined electromagnetic environment. It is a Part 3-2 supplement to IEC 61326-1 and applies to systems and devices that fall under IEC 61508 safety definitions with SIL 1–3. Edition 2.0 (2017) supersedes the 2008 edition and introduces a technical revision to better address modern electromagnetic threats.
Key topics and technical requirements
- Scope and application: Applies to equipment covered by IEC 61326-1 but limited to industrial installations with a specified electromagnetic environment and safety-related functionality.
- Immunity testing: Defines immunity test plans, test set-ups, and port-specific test requirements (enclosure, AC/DC power, I/O, functional earth).
- Expanded RF range: Radio‑frequency electromagnetic field testing (IEC 61000-4-3) extended up to 6 GHz to reflect higher-frequency sources.
- Performance criteria: Replaces the FS criterion with DS (degraded/Safe) per IEC 61000-6-7, and adds guidance (Table 1) on applying DS to safety functions.
- High-current devices: Adds immunity tests for equipment with current consumption > 16 A according to IEC 61000-4-34.
- Low-frequency conducted immunity: Introduces tests per IEC 61000-4-16 to replace IEC 61000-4-6 in the 10 kHz–150 kHz range.
- Test philosophy & documentation: Includes guidance on EUT configuration, monitoring, performance criteria (A/B/C and DS), test reporting, and annexes that define the specified electromagnetic environment and example immunity levels.
Practical applications
IEC 61326-3-2 is used to ensure that devices and systems performing safety functions remain safe or fail to a safe state under electromagnetic disturbance. Typical applications:
- Safety instrumented systems (SIS) and controllers in process and manufacturing plants
- Safety PLCs, emergency shutdown equipment, and safety sensors
- Industrial control equipment and field devices that implement SIL 1–3 functions
Practical outcomes for users:
- Establish EMC test plans that reflect safety requirements
- Verify that safety functions meet functional safety expectations under real-world electromagnetic stress
- Support conformity assessment, procurement specifications, and risk mitigation for EMC-related hazards
Who should use this standard
- Product manufacturers and EMC test labs
- Functional safety and compliance engineers
- System integrators and plant operators specifying safety equipment
- Certification bodies assessing EMC for safety-related products
Related standards
- IEC 61326-1 (generic EMC requirements)
- IEC 61508 (functional safety / SIL definitions)
- IEC 61000‑4‑3, IEC 61000‑4‑16, IEC 61000‑4‑34 (immunity test methods)
- IEC 61000‑6‑7 (generic performance criterion DS guidance)
Keywords: IEC 61326-3-2, EMC requirements, immunity requirements, functional safety, SIL, industrial electromagnetic environment, IEC 61508, IEC 61000-4-3.
Standards Content (Sample)
IEC 61326-3-2 ®
Edition 2.0 2017-05
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
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
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IEC 61326-3-2 ®
Edition 2.0 2017-05
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
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
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 25.040.40; 33.100.20 ISBN 978-2-8322-4367-1
– 2 – IEC 61326-3-2:2017 RLV © IEC 2017
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 8
2 Normative references . 9
3 Terms, definitions and abbreviations . 10
3.1 Terms and definitions . 10
3.2 Abbreviations . 14
4 General . 14
5 EMC test plan . 15
5.1 General . 15
5.2 Instruction for testing . 15
5.3 Configuration of EUT during testing . 15
5.3.1 General . 15
5.3.2 Composition of EUT . 16
5.3.3 Assembly of EUT . 16
5.3.4 I/O ports . 16
5.3.5 Auxiliary equipment (AE) . 16
5.3.6 Cabling and earthing (grounding) . 16
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 . 17
5.6 Test description . 17
6 Performance criteria . 17
6.1 General . 17
6.2 Performance criteria A, B and C . 17
6.3 Performance criterion FS DS . 17
6.3.1 Definition of performance criterion DS . 17
6.3.2 Application of the performance criterion FS DS . 18
6.3.3 Aspects to be considered during application of performance criterion DS . 18
7 Immunity requirements . 19
8 Test set-up and test philosophy for EUT with functions intended for safety
applications . 24
8.1 Testing of safety-related systems and equipment intended to be used in
safety-related systems . 24
8.2 Test philosophy for equipment intended for use in safety-related systems . 24
8.3 Test philosophy for safety-related systems . 24
8.4 Test configuration and test performance . 25
8.5 Monitoring . 26
9 Test results and test report . 26
Annex A (informative) Approaches on how to apply IEC 61326-3 series . 32
Annex B (informative) Evaluation of electromagnetic phenomena . 34
Annex C (informative normative) Details of the Specified electromagnetic environment . 36
C.1 General . 36
C.2 Industrial area with limited access . 36
C.3 Limited use of mobile transmitters . 36
C.4 Dedicated cables for power supply and control, signal or communication
lines . 37
C.5 Separation between power supply and control, signal or communication
cables . 37
C.6 Factory building mostly consisting of metal construction . 38
C.7 Overvoltage/lightning protection by appropriate measures . 38
C.8 Pipe heating systems driven by AC mains may be present . 39
C.9 No high-voltage substations close to sensitive areas . 39
C.10 Presence of low-power devices using ISM frequencies according to
CISPR 11 . 39
C.11 Competent staff . 39
C.12 Periodic maintenance of equipment and systems . 39
C.13 Installation guidelines for equipment and systems . 39
Annex D (informative) Example of immunity levels in the process industry . 40
Bibliography . 42
Figure 1 – Typical test set-up for equipment intended for use in safety-related system,
tested as stand-alone equipment or entire system . 27
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 . 29
Figure 3 – Typical test set-up for equipment intended for use in a safety-related system
tested stand-alone .
Figure 4 – 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 . 33
Figure C.1 – Recommended cable layouts for different categories . 38
Table 1 – Reaction of EUT during test . 19
Table 2 – Immunity test requirements for equipment intended for use in industrial
locations with specified electromagnetic environment – Enclosure port . 19
Table 3 – Immunity test requirements for equipment intended for use in industrial
locations with specified electromagnetic environment – Input and output AC
power ports . 21
Table 4 – Immunity test requirements for equipment intended for use in industrial
locations with specified electromagnetic environment – Input and output DC
power ports . 22
Table 5 – Immunity test requirements for equipment intended for use in industrial
locations with specified electromagnetic environment – I/O signal/control ports . 22
Table 6 – Immunity test requirements for equipment intended for use in industrial
locations with specified electromagnetic environment – I/O signal/control ports
connected directly to power supply networks . 23
Table 7 – Immunity test requirements for equipment intended for use in industrial
locations with specified electromagnetic environment – Functional earth port . 23
Table B.1 – General considerations for the application of electromagnetic phenomena
for functional safety in industrial applications with specified electromagnetic
environment (examples) . 35
Table D.1 – Immunity test requirements for equipment intended for use in industrial
locations with a specified electromagnetic environment according to NE 21 . 40
– 4 – IEC 61326-3-2:2017 RLV © IEC 2017
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
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
FOREWORD
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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 61326-3-2 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 Figure A.1 and Figure 1 for better readability,
• adding tests according to IEC 61000-4-16 to replace the tests according to IEC 61000-4-6
in the frequency range between 10 kHz and 150 kHz.
IEC 61326-3-2 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/820/FDIS 65A/826/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 61326-3-2:2017 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 integrated 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 61326-3-2:2017 RLV © IEC 2017
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
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 within a
specified electromagnetic environment and 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 they can be found in industrial applications with an
electromagnetic environment having specified characteristics (for example, process industry),
and based on the requirements of the process industry, specifically
chemical/petrochemical/pharmaceutical manufacturing plants using the mitigation measures
given in Annex C. The difference between the electromagnetic environment covered by this
document compared to the general industrial environment (see IEC 61326-3-1) is due to the
mitigation measures employed against electromagnetic phenomena leading to a specified
electromagnetic environment with test values that have been proven in practice.
The environment of industrial application with a specified electromagnetic environment
typically includes the following characteristics:
– industrial area with limited access;
– limited use of mobile transmitters;
– dedicated cables for power supply and control, signal or communication lines;
– separation between power supply and control, signal or communication cables;
– factory building mostly consisting of metal construction;
– overvoltage/lightning protection by appropriate measures (for example, metal construction
of the building or use of protection devices);
– pipe heating systems driven by AC main power may be present;
– no high-voltage substation close to sensitive areas;
– presence of CISPR 11 Group 2 ISM equipment using ISM frequencies only with low power;
– competent staff;
– periodical maintenance of equipment and systems;
– mounting and installation guidelines for equipment and systems.
A more detailed description of the above-mentioned typical characteristics is given in
Annex B.
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 61000-4-16:2015, 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 61000-6-2:2005, Electromagnetic compatibility (EMC) – Part 6-2: Generic standards –
Immunity for industrial environments
______________
There exists a consolidated edition 1.1 (2001) that includes edition 1.0 and its amendment.
– 10 – IEC 61326-3-2:2017 RLV © IEC 2017
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 61326-3-1:2008__ , 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 functions (functional safety) – General industrial
applications
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
IEC 61508-4:1998, Functional safety of electrical/electronic/programmable electronic safety-
related systems – Part 4: Definitions and abbreviations
IEC 61511-1:2003, Functional safety – Safety instrumented systems for the process industry
sector – Part 1: Framework, definitions, system, hardware and software requirements
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 of 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:
______________
Under preparation. Stage at the time of publication: IEC/DIS 61326-3-1:2016.
• IEC Electropedia: available at http://www.electropedia.org
• ISO Online browing platform: available at http://www.iso.org/obp
NOTE Other definitions not included in IEC 60050-161 and in this standard, but nevertheless necessary for the
application of the different tests, are given in the EMC basic publications of 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]
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, modifed – "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]
– 12 – IEC 61326-3-2:2017 RLV © IEC 2017
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
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 equipment.
3.12
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
– 14 – IEC 61326-3-2:2017 RLV © IEC 2017
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 with a specified
electromagnetic environment intended to perform safety functions as defined in the IEC 61508
series. These additional requirements do not apply to the normal (non-safety-related)
functions of the equipment and/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 is also not considered on a statistical basis. Therefore, it is needed to control the
environment (for example, defining installation requirements, limited use of mobile
transmitters) or to generally increase immunity test levels 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.
In addition to the immunity requirements of IEC 6132
...
IEC 61326-3-2 ®
Edition 2.0 2017-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
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
Matériel électrique de mesure, de commande et de laboratoire – Exigences
relatives à la CEM –
Partie 3-2: 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 dont l’environnement
électromagnétique est spécifié
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IEC 61326-3-2 ®
Edition 2.0 2017-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
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
Matériel électrique de mesure, de commande et de laboratoire – Exigences
relatives à la CEM –
Partie 3-2: 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 dont l’environnement
électromagnétique est spécifié
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 25.040.40; 33.100.20 ISBN 978-2-8322-4213-1
– 2 – IEC 61326-3-2:2017 © IEC 2017
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 8
2 Normative references . 8
3 Terms, definitions and abbreviations . 10
3.1 Terms and definitions . 10
3.2 Abbreviations . 13
4 General . 13
5 EMC test plan . 13
5.1 General . 13
5.2 Instruction for testing . 14
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) . 15
5.3.6 Cabling and earthing (grounding) . 15
5.4 Operation conditions of EUT during testing . 15
5.4.1 Operation modes . 15
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 . 16
6.1 General . 16
6.2 Performance criteria A, B and C . 16
6.3 Performance criterion DS . 16
6.3.1 Definition of performance criterion DS . 16
6.3.2 Application of the performance criterion DS . 16
6.3.3 Aspects to be considered during application of performance criterion DS . 17
7 Immunity requirements . 17
8 Test set-up and test philosophy for EUT with functions intended for safety
applications . 20
8.1 Testing of safety-related systems and equipment intended to be used in
safety-related systems . 20
8.2 Test philosophy for equipment intended for use in safety-related systems . 20
8.3 Test philosophy for safety-related systems . 21
8.4 Test configuration and test performance . 21
8.5 Monitoring . 22
9 Test results and test report . 22
Annex A (informative) Approaches on how to apply IEC 61326-3 series . 25
Annex B (informative) Evaluation of electromagnetic phenomena . 27
Annex C (normative) Specified electromagnetic environment . 29
C.1 General . 29
C.2 Industrial area with limited access . 29
C.3 Limited use of mobile transmitters . 29
C.4 Dedicated cables for power supply and control, signal or communication
lines . 30
C.5 Separation between power supply and control, signal or communication
cables . 30
C.6 Factory building mostly consisting of metal construction . 31
C.7 Overvoltage/lightning protection by appropriate measures . 31
C.8 Pipe heating systems driven by AC mains . 32
C.9 No high-voltage substations close to sensitive areas . 32
C.10 Presence of low-power devices using ISM frequencies according to
CISPR 11 . 32
C.11 Competent staff . 32
C.12 Periodic maintenance of equipment and systems . 32
C.13 Installation guidelines for equipment and systems . 32
Annex D (informative) Example of immunity levels in the process industry . 33
Bibliography . 36
Figure 1 – Typical test set-up for equipment intended for use in safety-related system,
tested as stand-alone equipment or entire system . 23
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 . 24
Figure A.1 – Correlation between the standards IEC 61326-1, IEC 61326-2-x,
IEC 61326-3-1 and IEC 61326-3-2 . 26
Figure C.1 – Recommended cable layouts for different categories . 31
Table 1 – Reaction of EUT during test . 17
Table 2 – Immunity test requirements – Enclosure port . 18
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 directly to
power supply networks. 19
Table 7 – Immunity test requirements – Functional earth port . 20
Table B.1 – General considerations for the application of electromagnetic phenomena
for functional safety in industrial applications with specified electromagnetic
environment (examples) . 28
Table D.1 – Immunity test requirements for equipment intended for use in industrial
locations with a specified electromagnetic environment according to NE 21 . 34
– 4 – IEC 61326-3-2:2017 © IEC 2017
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
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
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
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agreement between the two organizations.
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6) All users should ensure that they have the latest edition of this publication.
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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 61326-3-2 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 Figure A.1 and Figure 1 for better readability,
• adding tests according to IEC 61000-4-16 to replace the tests according to IEC 61000-4-6
in the frequency range between 10 kHz and 150 kHz.
IEC 61326-3-2 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/820/FDIS 65A/826/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 61326-3-2:2017 © 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 61326-3-2:2017 © IEC 2017
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
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 within a specified electromagnetic
environment and 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, and based on the requirements of the process industry,
specifically chemical/petrochemical/pharmaceutical manufacturing plants using the mitigation
measures given in Annex C. The difference between the electromagnetic environment
covered by this document compared to the general industrial environment (see IEC 61326-3-
1) is due to the mitigation measures employed against electromagnetic phenomena leading to
a specified electromagnetic environment with test values that have been proven in practice.
The environment of industrial application with a specified electromagnetic environment
typically includes the following characteristics:
– industrial area with limited access;
– limited use of mobile transmitters;
– dedicated cables for power supply and control, signal or communication lines;
– separation between power supply and control, signal or communication cables;
– factory building mostly consisting of metal construction;
– overvoltage/lightning protection by appropriate measures (for example, metal construction
of the building or use of protection devices);
– pipe heating systems driven by AC main power;
– no high-voltage substation close to sensitive areas;
– presence of CISPR 11 Group 2 ISM equipment using ISM frequencies only with low power;
– competent staff;
– periodical maintenance of equipment and systems;
– mounting and installation guidelines for equipment and systems.
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 61326-1:2012, Electrical equipment for measurement, control and laboratory use – EMC
requirements – Part 1: General requirements
IEC 61326-3-1:__ , 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 functions (functional safety) – General industrial applications
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
______________
Under preparation. Stage at the time of publication: IEC/DIS 61326-3-1:2016.
– 10 – IEC 61326-3-2:2017 © IEC 2017
3 Terms, definitions and abbreviations
3.1 Terms and definitions
For the purposes of this document, the terms and definitions of 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 browing platform: available at http://www.iso.org/obp
NOTE Other definitions not included in IEC 60050-161 and in this standard, but nevertheless necessary for the
application of the different tests, are given in the EMC basic publications of 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:
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, modifed – "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).
– 12 – IEC 61326-3-2:2017 © IEC 2017
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 equipment.
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 requirements for
systems and equipment for industrial applications with a specified electromagnetic
environment intended to perform safety functions as defined in the IEC 61508 series. These
requirements do not apply to the normal (non-safety-related) functions of the equipment
and/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 61508-2:2010, 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.
Therefore, it is needed to control the environment (for example, defining installation
requirements, limited use of mobile transmitters) or to generally increase immunity test levels
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.
In addition to the immunity requirements of IEC 61326-1, the experience with this type of
electromagnetic environment is used to specify adequate levels of immunity and adequate
performance criteria.
NOTE 2 For the determination of adequate levels and performance criteria, data related to the occurrence of
faults have been collected and analysed. For the evaluation, more than 20 000 units in safety applications are
analysed annually on the occurrence of failures whereas it has been shown that the failure rates meet the SIL
requirements. These units are in compliance with specified EMC requirements applicable for their normal functions
within the process industry (see Annex C).
NOTE 3 The requirements for a safety-related system intended to implement the specified function and to fulfil
the SSRS are described in IEC 61508. The SSRS specifies all relevant requirements of the intended application.
According to IEC 61508, equipment intended for use in that system fulfils the relevant requirements derived from
the SSRS.
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.
– 14 – IEC 61326-3-2:2017 © IEC 2017
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 instruction 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
equipment may vary from system t
...
Frequently Asked Questions
IEC 61326-3-2:2017 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 3-2: Immunity requirements for safety-related systems and for equipment intended to perform safety-related functions (functional safety) - Industrial applications with specified electromagnetic environment". This standard covers: IEC 61326-3-2:2017 covers all equipment within the scope of IEC 61326-1, but is limited to systems and equipment for industrial applications within a specified electromagnetic environment and 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 Figure A.1 and Figure 1 for better readability, - adding tests according to IEC 61000-4-16 to replace the tests according to IEC 61000-4-6 in the frequency range between 10 kHz and 150 kHz.
IEC 61326-3-2:2017 covers all equipment within the scope of IEC 61326-1, but is limited to systems and equipment for industrial applications within a specified electromagnetic environment and 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 Figure A.1 and Figure 1 for better readability, - adding tests according to IEC 61000-4-16 to replace the tests according to IEC 61000-4-6 in the frequency range between 10 kHz and 150 kHz.
IEC 61326-3-2:2017 is classified under the following ICS (International Classification for Standards) categories: 25.040.40 - Industrial process measurement and control; 29.140.30 - Fluorescent lamps. Discharge lamps; 33.100.20 - Immunity. The ICS classification helps identify the subject area and facilitates finding related standards.
IEC 61326-3-2:2017 has the following relationships with other standards: It is inter standard links to IEC 61326-3-2:2008, IEC 61326-3-2:2008/ISH1:2013. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
You can purchase IEC 61326-3-2:2017 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.
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