IEC 61131-2:2017

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

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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

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

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

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
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2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
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4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
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between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
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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
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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
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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 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.
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 power supplies, I/Os and other components
(Clause 6);
• EMC requirements and tests (Clause 7);
• Marking and documentation requirements (Clause 8).
Product safety requirements for PLC and the other types of industrial control equipment now
in the scope of this standard are specified in IEC 61010-2-201, which replaces the
requirements of Clauses 11 to 14 of IEC 61131-2:2007.
The operating conditions and the temperature derating for altitudes are aligned with
IEC 61010-2-201:– .
___________
Under preparation. Stage at the time of publication: IEC /CDV 61010-2-201:2016.

– 10 – IEC 61131-2:2017 © IEC 2017
INDUSTRIAL-PROCESS MEASUREMENT AND CONTROL –
PROGRAMMABLE CONTROLLERS –
Part 2: Equipment requirements and tests

1 Scope
This part of IEC 61131 specifies functional and electromagnetic compatibility requirements
and related verification tests for industrial control equipment of the following types:
• programmable controllers (PLC);
• programmable automation controller (PAC);
• remote I/O;
• programming and debugging tools (PADTs);
• industrial PC (computers) and industrial panel PC;
• displays and human-machine Interfaces (HMI) for industrial use;
• distributed control system (DCS), and DCS components that are listed here in the scope;
• any product where the primary purpose is performing the function of industrial control
equipment, including PLC and/or PAC, and/or their associated peripherals which have as
their intended use the control and command of machines, automated manufacturing and
industrial processes, e.g. discrete, batch and continuous control.
In this document “control equipment” is equivalent to “industrial control equipment” as are
PLC and PAC.
Equipment in the scope
Control, HMI, etc
PADT
Multiple human-
machine interfaces, PC
PLC
DCS
I/O
Networks
Interfaces/Ports
Data, power, etc., interconnections
Interfaces/Ports
Equipment
Sensors
Actuators
power
Interfaced
devices and
signals
Equipment not in the scope
IEC
Figure 1 – Equipment in the scope and not in the scope
Components of the above named equipment (see Figure 1) included in the scope of this
standard are:
• (auxiliary) stand-alone power supplies;
• peripherals such as digital and analog I/O;
• industrial network equipment.
Control equipment and their associated peripherals are intended to be used in an industrial
environment and may be provided as open or enclosed equipment.
If control equipment or its associated peripherals are intended for use in other environments
(light industrial, commercial, residential), then the specific requirements, standards and
installation practices for those other environments shall be additionally applied to the control
equipment and its associated peripherals.
Equipment covered in this standard is intended for use in overvoltage category II
(IEC 60664-1) in low-voltage installations, where the rated equipment supply voltage does not
exceed AC 1 000 V r.m.s. (50/60 Hz), or DC 1 000 V. If control equipment or their associated
peripherals are applied in overvoltage category III installations, then additional analysis will
be required to determine the suitability of the equipment for those applications.
The object of this standard is to establish the definitions and identify the principal
characteristics relevant to the selection and application of control equipment and their
associated peripherals.
– 12 – IEC 61131-2:2017 © IEC 2017
This standard also specifies:
a) service (operating, storage and transportation) requirements for control equipment and
their associated peripherals (Clause 5);
b) functional requirements for control equipment and their associated peripherals (Clause 6);
c) EMC requirements for control equipment and their associated peripherals (Clause 7);
d) information that the manufacturer is required to supply (Clause 8).
Safety requirements for control equipment and their associated peripherals are specified in
IEC 61010-2-201.
The requirements of IEC Guide 106, “Guide for specifying environmental conditions for
equipment performance rating”, and IEC Guide 107 “Electromagnetic compatibility – Guide to
the drafting of electromagnetic compatibility publications,”are incorporated herein.
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 60068-2-1, Environmental testing – Part 2-1: Tests – Test A: Cold
IEC 60068-2-2, Environmental testing – Part 2-2: Tests – Test B: Dry heat
IEC 60068-2-6, Environmental testing – Part 2-6: Tests – Test Fc: Vibration (sinusoidal)
IEC 60068-2-14, Environmental testing – Part 2-14: Tests – Test N: Change of temperature
IEC 60068-2-27, Environmental testing – Part 2-27: Tests – Test Ea and guidance: Shock
IEC 60068-2-30, Environmental testing – Part 2-30: Tests – Test Db: Damp heat, cyclic
(12 + 12 h cycle)
IEC 60068-2-31, Environmental testing –
...