SIST EN IEC 61131-2:2026

SLOVENSKI STANDARD
01-februar-2026
Merjenje in nadzor v industrijskih procesih - Programirljivi krmilniki - 2. del:
Zahteve za opremo in preskusi (IEC 61131-2:2017)
Industrial-process measurement and control - Programmable controllers - Part 2:
Equipment requirements and tests (IEC 61131-2:2017)
Industrielle Leittechnik - Speicherprogrammierbare Steuerungen - Teil 2:
Betriebsmittelanforderungen und Prüfungen (IEC 61131-2:2017)
Mesurage et contrôle des processus industriels - Automates programmables - Partie 2:
Exigences et essais des équipements (IEC 61131-2:2017)
Ta slovenski standard je istoveten z: EN IEC 61131-2:2025
ICS:
25.040.40 Merjenje in krmiljenje Industrial process
industrijskih postopkov measurement and control
35.240.50 Uporabniške rešitve IT v IT applications in industry
industriji
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN IEC 61131-2

NORME EUROPÉENNE
EUROPÄISCHE NORM December 2025
ICS 25.040.40; 35.240.50 Supersedes EN 61131-2:2007
English Version
Industrial-process measurement and control - Programmable
controllers - Part 2: Equipment requirements and tests
(IEC 61131-2:2017)
Mesurage et contrôle des processus industriels - Automates Industrielle Leittechnik - Speicherprogrammierbare
programmables - Partie 2: Exigences et essais des Steuerungen - Teil 2: Betriebsmittelanforderungen und
équipements Prüfungen
(IEC 61131-2:2017) (IEC 61131-2:2017)
This European Standard was approved by CENELEC on 2025-10-30. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Türkiye and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2025 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 61131-2:2025 E

European foreword
The text of document 65B/1083/FDIS, future edition 4 of IEC 61131-2, prepared by SC 65B
"Measurement and control devices" of IEC/TC 65 "Industrial-process measurement, control and
automation" was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2026-12-31
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2030-12-31
document have to be withdrawn
This document supersedes EN 61131-2:2007 and all of its amendments and corrigenda (if any).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
This document has been prepared under a standardization request addressed to CENELEC by the
European Commission. The Standing Committee of the EFTA States subsequently approves these
requests for its Member States.
Any feedback and questions on this document should be directed to the users’ national committee. A
complete listing of these bodies can be found on the CENELEC website.
Endorsement notice
The text of the International Standard IEC 61131-2:2017 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standard indicated:
IEC 60038 NOTE Approved as EN 60038
IEC 60068-2-78 NOTE Approved as EN IEC 60068-2-78
IEC 60721-3-0 NOTE Approved as EN IEC 60721-3-0
IEC 60721-3-1 NOTE Approved as EN IEC 60721-3-1
IEC 60721-3-2 NOTE Approved as EN IEC 60721-3-2
IEC 60721-3-3 NOTE Approved as EN IEC 60721-3-3
IEC 60721-3-7 NOTE Approved as EN 60721-3-7
IEC 60947-5-2 NOTE Approved as EN IEC 60947-5-2
IEC 60947-5-6 NOTE Approved as EN 60947-5-6
IEC 61300-3-2 NOTE Approved as EN 61300-3-2
IEC 61300-3-3 NOTE Approved as EN 61300-3-3
IEC 61000-4-29 NOTE Approved as EN 61000-4-29
IEC 61010-1:2010 NOTE Approved as EN 61010-1:2010 (not modified)
CISPR 14-1 NOTE Approved as EN IEC 55014-1
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
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.
NOTE 1  Where an International Publication has been modified by common modifications, indicated by (mod),
the relevant EN/HD applies.
NOTE 2  Up-to-date information on the latest versions of the European Standards listed in this annex is available
here: www.cencenelec.eu.
Publication Year Title EN/HD Year
IEC 60068-2-1 - Environmental testing - Part 2-1: Tests - EN 60068-2-1 -
Test A: Cold
IEC 60068-2-2 - Environmental testing - Part 2-2: Tests - EN 60068-2-2 -
Test B: Dry heat
IEC 60068-2-6 - Environmental testing - Part 2-6: Tests - EN 60068-2-6 -
Test Fc: Vibration (sinusoidal)
IEC 60068-2-14 - Environmental testing - Part 2-14: Tests - EN IEC 60068-2-14 -
Test N: Change of temperature
IEC 60068-2-27 - Environmental testing - Part 2-27: Tests - EN 60068-2-27 -
Test Ea and guidance: Shock
IEC 60068-2-30 - Environmental testing - Part 2-30: Tests - EN 60068-2-30 -
Test Db: Damp heat, cyclic (12 h + 12 h
cycle)
IEC 60068-2-31 - Environmental testing - Part 2-31: Tests - EN 60068-2-31 -
Test Ec: Rough handling shocks, primarily
for equipment-type specimens
IEC 60417 1973 Graphical symbols for use on equipment. - -
Index, survey and compilation of the single
sheets.
IEC 60947-5-1 2016 Low-voltage switchgear and controlgear - EN 60947-5-1 2017
Part 5-1: Control circuit devices and
switching elements - Electromechanical
control circuit devices
IEC 61000-4-2 2008 Electromagnetic compatibility (EMC) - Part EN 61000-4-2 2009
4-2: Testing and measurement techniques -
Electrostatic discharge immunity test
IEC 61000-4-3 2006 Electromagnetic compatibility (EMC) - Part EN 61000-4-3 2006
4-3 : Testing and measurement techniques -
Radiated, radio-frequency, electromagnetic
field immunity test
Publication Year Title EN/HD Year
IEC 61000-4-4 2012 Electromagnetic compatibility (EMC) - Part EN 61000-4-4 2012
4-4: Testing and measurement techniques -
Electrical fast transient/burst immunity test
IEC 61000-4-5 2014 Electromagnetic compatibility (EMC) - Part EN 61000-4-5 2014
4-5: Testing and measurement techniques -
Surge immunity test
IEC 61000-4-6 2013 Electromagnetic compatibility (EMC) - Part EN 61000-4-6 2014
4-6: Testing and measurement techniques -
Immunity to conducted disturbances,
induced by radio-frequency fields
IEC 61000-4-8 2009 Electromagnetic compatibility (EMC) - Part EN 61000-4-8 2010
4-8: Testing and measurement techniques -
Power frequency magnetic field immunity
test
IEC 61000-4-11 2004 Electromagnetic compatibility (EMC) - Part EN 61000-4-11 2004
4-11: Testing and measurement techniques
- Voltage dips, short interruptions and
voltage variations immunity tests
IEC 61000-4-18 2006 Electromagnetic compatibility (EMC) - Part EN 61000-4-18 2007
4-18: Testing and measurement techniques
- Damped oscillatory wave immunity test
IEC 61000-6-1 2016 Electromagnetic compatibility (EMC) - Part EN IEC 61000-6-1 2019
6-1: Generic standards - Immunity standard
for residential, commercial and light-
industrial environments
IEC 61000-6-2 2016 Electromagnetic compatibility (EMC) - Part EN IEC 61000-6-2 2019
6-2: Generic standards - Immunity standard
for industrial environments
IEC 61000-6-4 - Electromagnetic compatibility (EMC) - Part EN IEC 61000-6-4 -
6-4: Generic standards - Emission standard
for industrial environments
IEC 61010-2-201 - Safety requirements for electrical equipment EN IEC 61010-2-201 -
for measurement, control, and laboratory
use - Part 2-201: Particular requirements for
control equipment
IEC 61131-1 - Programmable controllers - Part 1: General EN 61131-1 -
information
IEC 61131-3 - Programmable controllers - Part 3: EN 61131-3 -
Programming languages
IEC 61131-9 - Programmable controllers - Part 9: Single- EN IEC 61131-9 -
drop digital communication interface for
small sensors and actuators (SDCI)
IEC/TR 61131-4 2004 Programmable controllers - Part 4: User - -
guidelines
IEC 61158 series Industrial communication networks - EN IEC 61158 series
Fieldbus specifications
IEC 61784 series Industrial communication networks - Profiles EN IEC 61784 series
ISO 7000 - Graphical symbols for use on equipment - - -
Registered symbols
Publication Year Title EN/HD Year
ANSI/ISA- 1975 - Compatibility of Analog Signals for - -
50.00.01 (R2012) Electronic Industrial Process Instruments
HCF_SPEC-13 Rev 7.5 HART (Highway Addressable Remote - -
Transducer) Communication Protocol
Specification
IEC 61131-2 ®
Edition 4.0 2017-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Industrial-process measurement and control – Programmable controllers –

Part 2: Equipment requirements and tests

Mesurage et contrôle des processus industriels – Automates programmables –

Partie 2: Exigences et essais des équipements

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 25.040.40; 35.240.50 ISBN 978-2-8322-4580-4

– 2 – IEC 61131-2:2017 © IEC 2017
CONTENTS
FOREWORD . 7
INTRODUCTION . 9
1 Scope . 10
2 Normative references . 12
3 Terms, definitions, abbreviated terms, acronyms, conventions and symbols . 13
3.1 Terms and definitions. 13
3.2 Abbreviated terms, acronyms, conventions and symbols . 18
4 Compliance and type tests . 19
4.1 Compliance with this standard . 19
4.2 Type tests . 20
4.2.1 General . 20
4.2.2 Equipment to be tested (equipment under test/EUT) . 20
4.2.3 Special features for EMC tests . 23
4.2.4 Withstand test conditions . 23
4.2.5 Climatic tests . 23
4.2.6 Functionality verification with temperature . 23
4.2.7 Verification procedure . 27
4.2.8 Requirements for test programmes and proper functioning verification

procedures (PFVPs) to be provided by the manufacturer . 28
4.2.9 EMC Performance criteria . 28
4.2.10 General facility/laboratory conditions for tests . 29
4.3 Test report . 29
5 Normal service conditions and requirements . 30
5.1 General . 30
5.2 Operating conditions and requirements . 30
5.2.1 Ambient temperature and relative humidity . 30
5.2.2 Altitude . 34
5.3 Mechanical operating conditions and requirements . 35
5.3.1 General . 35
5.3.2 Vibrations . 35
5.3.3 Shock . 36
5.3.4 Free falls (portable and hand-held equipment) . 36
5.4 Transport and storage conditions and requirements . 37
5.4.1 General . 37
5.4.2 Ambient temperature and relative humidity . 37
5.4.3 Altitude . 39
5.4.4 Free falls (in manufacturer's original packaging) . 39
6 Functional requirements . 40
6.1 General . 40
6.2 Power input ports . 41
6.2.1 Requirements . 41
6.2.2 Verification of power input ports (a.c. or d.c.) . 42
6.3 Memory power back-up . 46
6.3.1 Requirements . 46
6.3.2 Verification of memory power back-up requirements . 46
6.4 Digital I/Os . 48

IEC 61131-2:2017 © IEC 2017 – 3 –
6.4.1 General . 48
6.4.2 Positive logic digital I/Os (sinking inputs / sourcing outputs) . 48
6.4.3 Negative logic digital I/Os (sourcing inputs / sinking outputs) . 48
6.4.4 Digital inputs (positive logic, current sinking) . 49
6.4.5 Digital outputs for alternating currents (positive logic, current sourcing) . 52
6.4.6 Digital outputs for direct current (current sourcing) . 57
6.4.7 Requirements for discrete channel compatibility with IEC 61131-9 SDCI . 61
6.4.8 Special digital I/O interfaces . 61
6.5 Analog I/Os . 61
6.5.1 General . 61
6.5.2 Analog inputs. 61
6.5.3 Analog outputs . 61
6.5.4 Analog temperature inputs . 62
6.5.5 Requirements for analog channel compatibility with HART® (Highway
Addressable Remote Transducer) . 62
6.5.6 Verification of analog I/Os . 62
6.6 Communication interface requirements . 64
6.6.1 General . 64
6.6.2 Verification of communication interface requirements . 64
6.7 Main processing unit(s) and memory(ies) requirements. 64
6.7.1 General . 64
6.7.2 Verification of processing unit requirements . 64
6.8 Remote input/output station (RIOS) requirements . 65
6.8.1 General . 65
6.8.2 Verification of local and remote I/O stations . 65
6.9 Peripherals (PADTs, TEs, HMIs) requirements . 66
6.9.1 General . 66
6.9.2 Verification of peripheral (PADTs, TEs, HMIs) requirements . 67
6.10 Self-tests and diagnostics requirements . 67
6.10.1 General . 67
6.10.2 Verification of self-tests and diagnostics . 67
6.11 Functional earth . 68
6.12 Requirements for information on normal service and function . 68
7 Electromagnetic compatibility (EMC) requirements . 68
7.1 General . 68
7.2 Emission requirements . 70
7.3 EMC immunity requirements . 71
7.3.1 Immunity levels . 71
7.3.2 Voltage dips and interruptions power ports . 77
7.4 Requirements for information on EMC installation . 78
8 Marking requirements and information to be provided by the manufacturer . 78
8.1 Verification . 78
8.2 General marking requirements . 78
8.2.1 Minimum marking requirement . 78
8.2.2 Functional identifications . 79
8.2.3 Functional earth terminals markings . 79
8.2.4 Documentation markings . 79
8.3 Information format and content . 79
8.3.1 Information format . 79

– 4 – IEC 61131-2:2017 © IEC 2017
8.3.2 Information content . 80
8.3.3 Information on compliance with this standard. 80
8.3.4 Information on shipping and storage . 80
8.3.5 Information on a.c. and d.c. power supply . 80
8.3.6 Information on digital inputs (current sinking) . 81
8.3.7 Information on digital outputs for alternating currents (current sourcing) . 81
8.3.8 Information on digital outputs for direct current (current sourcing). 82
8.3.9 Information on analog inputs . 82
8.3.10 Information on analog outputs . 84
8.3.11 Information on communication interfaces . 86
8.3.12 Information on main processing unit(s) and memory(ies) . 86
8.3.13 Information on remote input/output station (RIOS) . 86
8.3.14 Information on peripherals (PADTs, TEs, HMIs) . 87
8.3.15 Information on self-tests and diagnostics . 87
8.4 Information on EMC installation . 88
8.5 Information on reliability . 88
Annex A (informative) Temperature derating for altitude . 89
A.1 Standard atmosphere modelling . 89
A.1.1 Ambient temperature . 89
A.1.2 Aerostatics equation . 89
A.1.3 Air density . 90
A.1.4 Radiation . 90
A.1.5 Derating ratio . 91
A.1.6 Comparison with IEEE1613 . 91
Annex B (informative) Digital input standard operating range equations . 93
Annex C (normative) Zone C – EMC immunity levels . 94
Annex D (normative) Legacy techniques that are out-dated and not recommended for
new design . 97
D.1 Background . 97
D.2 Ambient temperature . 97
D.3 Type 2 digital input . 97
D.3.1 Definition . 97
D.3.2 Background . 97
D.4 Analog inputs . 98
D.5 Analog outputs . 99
D.6 CRT displays . 99
Annex E (informative) Application reasoning for a.c. and d.c. interruptions . 101
Annex F (normative) Digital I/O: Current-sourcing input and current-sinking output . 102
F.1 Digital I/O (negative logic) . 102
F.2 Function and verification . 104
Bibliography . 105

Figure 1 – Equipment in the scope and not in the scope . 11
Figure 2 – Example EUT configurations . 21
Figure 3 – General temperature test environment . 24
Figure 4 – Vented equipment . 25
Figure 5 – Non-vented equipment . 26

IEC 61131-2:2017 © IEC 2017 – 5 –
Figure 6 – Panel mounted equipment extending through the wall of a cabinet . 27
Figure 7 – Typical interface/port diagram of a modular control equipment . 41
Figure 8 – Gradual shut-down/start-up test . 44
Figure 9 – Fast supply voltage variation test . 45
Figure 10 – Slow supply voltage variation test . 45
Figure 11 – Positive logic (sinking inputs / sourcing outputs) . 48
Figure 12 – U-I operation regions of current-sinking inputs . 49
Figure 13 – Input Type 3 Diagnostic. 51
Figure 14 – Temporary overload waveform for digital a.c. outputs . 53
Figure 15 – Temporary overload waveform for digital d.c. outputs . 58
Figure 16 – EMC zones . 69
Figure A.1 – A small atmosphere element . 89
Figure E.1 – d.c. distribution to control equipment and faults . 101
Figure F.1 – Negative logic (sourcing inputs / sinking outputs) . 102
Figure F.2 – Positive logic with faults . 103
Figure F.3 – Negative logic with faults . 104

Table 1 – Criteria to prove the performance of an EUT against EMC disturbances . 29
Table 2 – General facility/laboratory conditions for tests . 29
Table 3 – Operating environments, ambient temperature and relative humidity . 30
Table 4 – Dry-heat withstand and immunity tests . 31
Table 5 – Cold withstand and immunity tests . 32
Table 6 – Change of temperature, withstand and immunity tests . 33
Table 7 – Cyclic (12 + 12) damp-heat withstand test . 34
Table 8 – Multiplication factors for equipment ambient temperature of operation at
altitudes up to 5 000 m . 35
Table 9 – Sinusoidal vibration conditions . 35
Table 10 – Immunity vibration test . 36
Table 11 – Immunity shock test . 36
Table 12 – Free fall on concrete floor for portable and hand-held equipment . 37
Table 13 – Storage environments, ambient temperature and relative humidity . 38
Table 14 – Transportation environments, ambient temperature and humidity . 38
Table 15 – Free fall on concrete floor in manufacturer’s original packaging . 39
Table 16 – Rated values and operating ranges of incoming power supply . 41
Table 17 – Voltage interruptions (functional requirements) . 42
Table 18 – Voltage ripple and frequency range immunity test. 43
Table 19 – Gradual shut-down/start-up test . 44
Table 20 – Supply voltage variation tests . 44
Table 21 – Voltage interruptions immunity test (Functional tests) . 46
Table 22 – Back-up duration withstand test . 47
Table 23 – Change of energy source test . 47
Table 24 – Operating ranges for digital inputs (current sinking) . 50
Table 25 – Rated values and operating ranges for current sourcing digital a.c. outputs . 52

– 6 – IEC 61131-2:2017 © IEC 2017
Table 26 – Overload test circuit values . 55
Table 27 – Endurance test circuit values . 55
Table 28 – Overload and short-circuit tests for digital outputs . 56
Table 29 – Rated values and operating ranges (d.c.) for current-sourcing digital d.c.
outputs . 57
Table 30 – Overload and short-circuit tests for digital outputs . 60
Table 31 – Rated values and impedance limits for analog inputs . 61
Table 32 – Rated values and impedance limits for analog outputs . 61
Table 33 – Analog output overload immunity test . 63
Table 34 – Insertion/withdrawal of removable units . 66
Table 35 – EMC zones & ptotection considerations . 70
Table 36 – Enclosure port tests, Zones A and B . 71
Table 37 – Conducted immunity tests, Zone B . 72
Table 38 – Conducted immunity tests, zone A . 73
Table 39 – Electrostatic discharge immunity test . 74
Table 40 – Radiated electromagnetic field immunity test . 75
Table 41 – Power-frequency magnetic field immunity test . 75
Table 42 – Fast transient burst immunity test . 76
Table 43 – High-energy surge immunity test . 76
Table 44 – Conducted r.f. immunity test . 77
Table 45 – Voltage dips and interruptions (EMC requirements) . 77
f
Table 46 – Voltage dips and interruptions immunity test (EMC tests) . 78
Table 47 – Analog input static characteristics . 83
Table 48 – Analog input dynamic characteristics . 83
Table 49 – Analog input general characteristics . 84
Table 50 – Analog input miscellaneous characteristics . 84
Table 51 – Analog output static characteristics . 84
Table 52 – Analog output dynamic characteristics . 85
Table 53 – Analog output general characteristics . 85
Table 54 – Analog output miscellaneous characteristics . 85
Table A.1 – Component temperature derating with altitude, 2 000 m as reference . 91
Table A.2 – Component temperature derating with altitude, 1 500 m as reference, and
20 °C at the sea level standard temperature . 91
Table C.1 – Enclosure port tests, Zone C . 94
Table C.2 – Conducted immunity tests, Zone C. 95
Table C.3 – Damped oscillatory wave immunity test . 96
Table D.1 – Standard operating ranges for Type 2 digital inputs (current sinking) . 98
Table D.2 – Rated values and impedance limits for analog inputs . 99
Table D.3 – Rated values and impedance limits for analog outputs . 99

IEC 61131-2:2017 © IEC 2017 – 7 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
INDUSTRIAL-PROCESS MEASUREMENT AND CONTROL –
PROGRAMMABLE CONTROLLERS –
Part 2: Equipment requirements and tests

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 61131-2 has been prepared by subcommittee 65B: Measurement
and control devices, of IEC technical committee 65: Industrial-process measurement, control
and automation.
This fourth edition cancels and replaces the third edition published in 2007. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) removal of safety requirements and instead pointing to IEC 61010-2-201;
b) addition of negative logic digital inputs and outputs;
c) addition of Type 3-d digital input;
d) addition of 2,7 GHz to 6 GHz requirement for Radio-frequency electro-magnetic amplitude
modulated immunity;
– 8 – IEC 61131-2:2017 © IEC 2017
e) clarification of temperature testing;
f) clarification of type testing;
g) deprecation of certain technologies;
h) general update of multiple aspects of functionality and EMC;
i) reorganization of clauses to associate requirements and verifications more closely.
The text of this standard is based on the following documents:
FDIS Report on voting
65B/1083/FDIS 65B/1091/RVD
Full information on the voting for the approval of this International Standard can be found in
the report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts in the IEC 61131 series, published under the general title Industrial-process
measurement and control – Programmable controllers, can be found on the IEC website.
Future standards in this series will carry the new general title as cited above. Titles of existing
standards in this series will be updated at the time of the next edition.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct
understanding of its contents. Users should therefore print this document using a
colour printer.
IEC 61131-2:2017 © IEC 2017 – 9 –
INTRODUCTION
IEC 61131-2 is part of a series of standards on industrial control equipment, including
programmable controllers, and their associated peripherals and should be read in conjunction
with the other parts of the series. However, it can be read and applied alone.
Where a conflict exists between this and other IEC standards, the provisions of this standard
should be considered to govern in the area of industrial control equipment, including
programmable controllers, and their associated peripherals.
This standard defines for industrial control equipment the following:
• Testing and verifications methods (Clause 4);
• Operating conditions (5.2);
• Temperature and climatic tests (5.2.1);
• Mechanical requirements and tests (5.3);
• Functional requirements and tests for po
...