Low-voltage switchgear and controlgear - Guidance for the development of embedded software (IEC/TR 63201:2019)

This document provides information, and recommended minimum requirements related to embedded software supporting the main functions of switchgear and controlgear during the whole lifecycle of the equipment. It includes also the parameterization aspects and basics about secure coding standards.

Niederspannungsschaltgeräte - Leitfaden für die Entwicklung von Firmware (IEC/TR 63201:2019)

Appareillage à basse tension - Guide pour le développement du logiciel embarqué (IEC/TR 63201:2019)

Nizkonapetostne stikalne in krmilne naprave - Navodilo za razvoj vgrajene programske opreme (IEC/TR 63201:2019)

General Information

Status
Published
Publication Date
03-Sep-2020
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
28-Aug-2020
Due Date
02-Nov-2020
Completion Date
04-Sep-2020

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SLOVENSKI STANDARD
SIST-TP CLC IEC/TR 63201:2020
01-november-2020
Nizkonapetostne stikalne in krmilne naprave - Navodilo za razvoj vgrajene
programske opreme (IEC/TR 63201:2019)

Low-voltage switchgear and controlgear - Guidance for the development of embedded

software (IEC/TR 63201:2019)
Niederspannungsschaltgeräte - Leitfaden für die Entwicklung von Firmware (IEC/TR
63201:2019)
Appareillage à basse tension - Guide pour le développement du logiciel embarqué
(IEC/TR 63201:2019)
Ta slovenski standard je istoveten z: CLC IEC/TR 63201:2020
ICS:
29.130.20 Nizkonapetostne stikalne in Low voltage switchgear and
krmilne naprave controlgear
35.080 Programska oprema Software
SIST-TP CLC IEC/TR 63201:2020 en

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

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SIST-TP CLC IEC/TR 63201:2020
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SIST-TP CLC IEC/TR 63201:2020
TECHNICAL REPORT CLC IEC/TR 63201
RAPPORT TECHNIQUE
TECHNISCHER BERICHT
August 2020
ICS 29.130.20
English Version
Low-voltage switchgear and controlgear - Guidance for the
development of embedded software
(IEC/TR 63201:2019)

Appareillage à basse tension - Guide pour le Niederspannungsschaltgeräte - Leitfaden für die

développement du logiciel embarqué Entwicklung von Firmware
(IEC/TR 63201:2019) (IEC/TR 63201:2019)
This Technical Report was approved by CENELEC on 2020-08-10.

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,

Turkey 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

© 2020 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.

Ref. No. CLC IEC/TR 63201:2020 E
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SIST-TP CLC IEC/TR 63201:2020
CLC IEC/TR 63201:2020 (E)
European foreword

This document (CLC IEC/TR 63201:2020) consists of the text of IEC/TR 63201:2019 prepared by

SC 121A "Low-voltage switchgear and controlgear" of IEC/TC 121 "Switchgear and controlgear and

their assemblies for low voltage".

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

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

Endorsement notice

The text of the International Technical Report IEC/TR 63201:2019 was approved by CENELEC as a

European Technical Report without any modification.

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

indicated:
IEC 60880:2006 NOTE Harmonized as EN 60880:2009 (not modified)
IEC 61508 (series) NOTE Harmonized as EN 61508 (series)
IEC 61508-3:2010 NOTE Harmonized as EN 61508-3:2010 (not modified)
IEC 61508-4:2010 NOTE Harmonized as EN 61508-4:2010 (not modified)
IEC 61508-7:2010 NOTE Harmonized as EN 61508-7:2010 (not modified)
IEC 61511-1:2016 NOTE Harmonized as EN 61511-1:2017 (not modified)
IEC 62061 NOTE Harmonized as EN 62061
IEC 62443 (series) NOTE Harmonized as EN IEC 62443 (series)
ISO 13849-1:2015 NOTE Harmonized as EN ISO 13849-1:2015 (not modified)
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SIST-TP CLC IEC/TR 63201:2020
CLC IEC/TR 63201:2020 (E)
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.cenelec.eu.
Publication Year Title EN/HD Year
ISO/IEC 2382-1 1993 Information technology - Vocabulary -- - -
Part 1: Fundamental terms
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SIST-TP CLC IEC/TR 63201:2020
IEC TR 63201
Edition 1.0 2019-05
TECHNICAL
REPORT
colour
inside
Low-voltage switchgear and controlgear – Guidance for the development of
embedded software
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.130.20 ISBN 978-2-8322-7006-6

Warning! Make sure that you obtained this publication from an authorized distributor.

® Registered trademark of the International Electrotechnical Commission
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CONTENTS

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

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

1 Scope ......................................................................................................... 7

2 Normative references ..................................................................................... 7

3 Terms and definitions ..................................................................................... 7

4 Risk assessment and identification of the main functions....................................... 10

5 Design management .................................................................................... 10

5.1 Objective............................................................................................ 10

5.2 Software management plan of the main functions ......................................... 10

5.3 Configuration management ..................................................................... 11

5.4 Change management ............................................................................ 11

5.5 Defect management .............................................................................. 12

5.6 System build and release processes ......................................................... 13

5.6.1 Binary generation ........................................................................... 13

5.6.2 Release management...................................................................... 13

6 Manual parameterization of the embedded software ............................................. 13

6.1 General ............................................................................................. 13

6.2 Influences on main function related parameters ........................................... 14

6.3 Requirements for software-based manual parameterization ............................ 14

6.4 Verification of the parameterization tool ..................................................... 15

6.5 Documentation of software-based manual parameterization ............................ 15

7 Design lifecycle........................................................................................... 15

7.1 General ............................................................................................. 15

7.2 Tools usage ........................................................................................ 16

7.3 Software lifecycle ................................................................................. 16

7.3.1 Software lifecycle model .................................................................. 16

7.3.2 Independence of review, testing and verification activities ........................ 17

7.4 Requirements definition ......................................................................... 18

7.4.1 General ....................................................................................... 18

7.4.2 System requirements ...................................................................... 18

7.4.3 Software requirements specification.................................................... 18

7.5 Software architecture ............................................................................ 20

7.5.1 General ....................................................................................... 20

7.5.2 Software architecture specification ..................................................... 20

7.6 Software unit design ............................................................................. 20

7.6.1 General ....................................................................................... 20

7.6.2 Input information ............................................................................ 20

7.6.3 Software unit specification ................................................................ 21

7.7 Coding............................................................................................... 21

7.8 Software unit test ................................................................................. 22

7.9 Software integration test ........................................................................ 22

7.10 Software testing ................................................................................... 22

7.10.1 General ....................................................................................... 22

7.10.2 Test planning and execution ............................................................. 23

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7.11 Documentation .................................................................................... 23

7.12 Configuration and change management process .......................................... 24

7.13 Verification and relationship with the validation of the equipment or system ........ 24

Bibliography ..................................................................................................... 26

Figure 1 – Defect management process .................................................................. 12

Figure 2 – V-model of software lifecycle .................................................................. 17

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INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR –
GUIDANCE FOR THE DEVELOPMENT OF EMBEDDED SOFTWARE
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, Techni ca l S pe cif i cat i ons,

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 intereste d

in the subject dealt with may participate in this preparat ory w ork. In t ern at i on al , go vern me nt al a n d n on -

governmental organizations liaising with the IEC also participate in this preparation. IEC collabo rat es cl o sel y

w ith the International Organization for Standardization (ISO) in accordance w i t h co nd i ti o ns d et ermi n e d b y

agreement between the tw o organizations.

2) The f ormal 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 committ ee h as r ep resen ta ti o n f ro m a l l

interested IEC National Committees.

3) IEC Publications have the form of recommendations for international use and are accep te d b y IEC Na t i o n a l

Committees in that sense. While all reasonable efforts are made to ensure that the tech ni cal c on te nt of IEC

Publications is accurate, IEC cannot be held responsi ble for the w ay in w hich they are used or for any

misinterpretation by any end user.

4) In order to promote international uniformity, IEC National Committees undertake t o a pp l y IEC Pu b l i c a ti o ns

transparently to the maximum extent possible in their national and r egional publications. Any divergence

betw een 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 pro vid e c onf o rmi ty

assessment services and, in some areas, access to IEC marks of conformity. IEC is not r esp onsi b l e f o r a ny

services carried out by independent certification bodies.

6) A ll 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 e xpe rts a n d

members of its technical committees and IEC National Committees for any personal injury, property damage o r

other damage of any nature whatsoever, whether direct or indirect, or for c osts ( i ncl ud i ng l e ga l f ees) a n d

expenses arising out of the publication, use of, or rel i a nce u p on , t h is IEC Pu b l i c a t i on o r a ny o t he r IEC

Publications.

8) A ttention is drawn to the Normative references cited in this publication. Use of the referenced p ub l i cat i ons i s

indispensable for the correct application of this publication.

9) A ttention is drawn to the possibility that some of the elements of this IEC Publicatio n ma y be t he su bj ect of

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

The main task of IEC technical committees is to prepare International Standards. Ho w e ve r , a

technical committee may propose the publication of a technical report when i t has c ol l ec ted

data of a different kind from that which is normally published as an International Standard, fo r

example "state of the art".

IEC TR 63201, which is a technical report, has been prepared by subcommi t te e 1 2 1 A : L o w-

voltage switchgear and controlgear, of IEC technical committee 121: Switchgear and

controlgear and their assemblies for low voltage.
The text of this technical report is based on the following documents:
Enquiry draft Report on voting
121A /256/DTR 121A /287A/RVDTR

Full information on the voting for the approval of this technical report can be found in the

report on voting indicated in the above table.
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IEC TR 63201:2019  IEC 2019 – 5 –

This document has been drafted in accordance with the ISO/IEC Directives, Part 2.

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 t o

the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revis ed edition, or
• amended.
A bilingual version of this publication may be issued at a later date.

IMPORTANT – The 'colour inside' logo on the cove r pa ge of this publication indicat e s t h a t i t

contains colours which are considered to be useful for the correct understanding of its

conte nts. Use rs should the re fore print this document using a colour printer.
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INTRODUCTION

Programmable electronics are now being integrated within switchgear and c ont rol gear. F or

example, soft-starters, electronic overload relays, circuit-breakers with elec tr o n ic t r i p u n i t s ,

proximity switches with built in micro-controllers and some acc es sories s uch as ex t ensi on

modules and control panels are using programmable electronics with embedded software

called firmware. This embedded software often supports the main functions (see 3.3) provided

by the equipment such as overcurrent protection and other import a n t fu n c ti o n s, e. g. al arm

detection from monitoring devices.

The integration of embedded software within switchgear and controlgear should n o t d e g r a d e

the integrity of their main functions compared to purely electromechanical equipment.

Therefore, a minimum set of standard requirements for embedded software is provided by this

document.

This document takes into account the existing best practices for developing embedded

software within safety functions for automation given by IEC 61508-3. Functional safety

approach is mainly used in machinery , automotive, automation and process automation where

safety functions are implemented with multiple components which should match a c o n s i ste n t

level of integrity when combined. In other sectors, such as electric distribution and power

control systems, key functions such as over-current release, residual c urrent rel eas e, l oad

monitoring, etc. should follow installation rules and coordination rules which are

systematically safety and reliability related. Therefore, this document can be seen as

providing the principles of the good practice given by IEC 61508-3.

This document is also intended to provide an up-to-date method with regards to the

supplement SE of UL 489.
The intention of this document is to provide guidance about:
– risk assessment aspects in relation to embedded software;
– embedded software evaluation method;
– software architecture;
– basic coding rules;
– measures to control software errors;

– software verification and its relationship with the validation of the equipment or system.

In this document, the term “software” is used as a generalized term for embedded software.

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LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR –
GUIDANCE FOR THE DEVELOPMENT OF EMBEDDED SOFTWARE
1 Scope

This document provides information, and recommended minimum requirements related to

embedded software supporting the main functions of switchgear and cont r o l g e a r d u r i n g t h e

whole lifecycle of the equipment. It includes also the parameteri zat ion as pect s and bas i c s

about secure coding standards.

This document can be used in addition to product standard requirem ent s when not al ready

covered.

This document is appropriate for new development or major changes in existing equipment.

This document is not intended to cover the functional safety of control systems for machi n e r y

or for automation which are covered by IEC 62061, ISO 13849-1 and IEC 61508 (all parts),

neither the cybersecurity risk which are covered by ISO 27005, and IEC 62443 (al l part s ). It

gives only some example of secure coding rules.

NOTE Future new publication IEC TS 63208 is under development for implementing embedd ed cybe rsecur it y

measures within switchgear and controlgear based on ISO 27005 and IEC 62443 (all parts).

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.

ISO/IEC 2382-1:1993, Information technology – Vocabulary – Part 1: Fundamental terms

3 T e rms and de finitions

For the purposes of this document, the terms and definitions given in ISO/IE C 2382-1: 1993,

as well as the following apply.

ISO and IEC maintain terminological databases for use in standardization at the following

addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1
e mbe dded softw a re

software, supplied by the manufacturer, that is an integral part of the eq u i p m e n t a n d t hat i s

not accessible for partial modification

Note 1 to entry: Firmw are and system software are examples of embedded software.

Note 2 to entry: A n embedded software can be upgraded by an integral upload.
__________
Future publication IEC TS 63208 is currently at CD stage.
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3.2
programmable electronic

based on computer technology which can comprise hardware, software, and input and/or

output units
EXA MPLE The f ollowing are all programmable electronics:
– microprocessors;
– micro-controllers;
– programmable controllers;

– application specific digital integrated circuits (ASICs with programmable part);

– 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.

Note 2 to entry: The term “ programmable component” is f rom A NSI/UL 1998:2013, definition 2.39.The definit i on

in A NSI/UL f or programmable component is: “A ny microelectronic hardware that can be programmed in the design

centre, the f actory, or in the f ield”. Here the term “programmable” is taken to be “any manner i n w h ich on e ca n

alter the software w herein the behaviour of the component can be altered.”

[SOURCE: IEC 61508-4:2010, 3.2.12, modified – In the definition, “may” changed by “can”,

“be” and “of” deleted, and addition of a new Note 2 to entry.]
3.3
ma in function

defined function of switchgear and contr o l g e a r w h o s e fa i l u r e

can result in its unwanted operation which can lead to hazardous situations, in the lo s s o f i t s

protective function, or in the loss of a key functionality defined by the manufacturer

3.4
syste ma tic fa ilure

failure related in a deterministic way to a certain cause, which c a n o n l y b e e l i m i n a t ed b y a

modification of the design or of the manufacturing process, operational procedures,

documentation or other relevant factors

Note 1 to entry: Corrective maintenance without modification will usually not eliminate the failure cause.

Note 2 to entry: A systematic failure can be induced by simulating the failure cause.

Note 3 to entry: Examples of causes of systematic failures include human error in:

– the safety requirements specification;
– the design, manufacture, installation and/or operation of the hardware;
– the design and/or implementation of the software.
[SOURCE: IEC 61508-4, 3.6.6, modified – Deletion of Note 4 to entry.]
3.5
full variability language
FVL

type of language that provides the capability to implement a wide variety of functions and

applications

Note 1 to entry: FV L is normally found in embedded software and is rarely used in application software.

Note 2 to entry: FV L examples include: Ada, C, Pascal, Instruction List, assembler languages, C++, Java, SQL.

[SOURCE: IEC 61511-1:2016, 3.2.75.3, modified – Deletion of “designed to be comprehensible

to computer programmers” and Note 1 to entry, remaining notes to entry renumbered.]

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3.6
configura tion ma nagement

discipline of identifying the components of an evolving system for the purposes of cont r o l l i n g

changes to those components and maintaining continuity and traceability throughout the

lifecycle at a specific point of time

[SOURCE: IEC 61508-4:2010, 3.7.3, modified – Addition of "at a specific point of time".]

3.7
baseline

agreed set of elements (hardware, software, documentation,

tests…) of an equipment at a specific point in time, which serves as a basis fo r ve r i fi c a t i o n ,

validation, modification and changes

Note 1 to entry: If an element is changed the status of the baseline is intermediate until a new baseline is defined.

3.8
coding rule s
coding sta nda rd

set of rules and guidelines for the formatting of software source code of a program intended to

ensure its readability, maintainability, compatibility and robustness

Note 1 to entry: Typical aspects of coding rules are naming conventions, file naming and organization, formatti ng

and indentation, comments and documentation, classes, functions and interfaces, allow ed/forbidden s tandard

library function usages, data types, pointer and reference usage, and testing.
3.9
softw a re unit
separately compilable piece of code

Note 1 to entry: Sof tware unit is also called software module and software component such as in documents fro m

International Software Testing Qualifications Board (ISTQB).

[SOURCE: ISO/IEC 12207:2008, 4.43, modified – Addition of a new Note 1 to entry.]

3.10
inte gration te sts

tests performed during the software units and hardware/software integration

process prior to the verification and system validation to verify compatibi li ty o f t h e s o ft w a r e

and the hardware

[SOURCE: IEC 60880:2006, 3.23, modified – Addition of “software units and”, replacement of

“computer-based” and “computer” by “the verification and system validation”.]
3.11
softw a re ve rification

confirmation by examination (e.g. tests, analysis) that the software, its integration or it s u n i t s

requirements have been fulfilled
3.12
sta tic a na lysis

examination of source code for features that may indicate the presence of

software faults

Note 1 to entry: Static analysis typically reveals unreachable sections of code, unused, misused, doubly-defi n ed

or uninitialized variables, and unintended execution paths.

Note 2 to entry: Static analysis normally employs computer aided software engineering tools.

[SOURCE: IEC 60050-192:2015, 192-09-22]
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3.13
system validation

confirmation by examination and provision of objective evidence that the r e q u i r e m e n t s fo r a

specific intended use of the equipment or the system are fulfilled

Note 1 to entry: By principle the embedded software is integrated in an equipment or a system. The validati on of

this equipment or system includes embedded software related verifications.
4 Risk asse ssment and ide ntification of the main functions

Based on manufacturer experience, a system analysis, in the context of the intended

applications of the equipment, including its different modes of operation and t h e r e a s o n a b l y

foreseeable misuse, should determine the list of main functions and t heir assoc iated degr ee

of risk.

EXA MPLE Sensor detection of an object, overcurrent protective function, continuity of supply, power off a mo t or

system.
A risk assessment method such as IEC Guide 116 should be used for this purpose.

Each software part implementing a main function should be managed according to the method

provided in this document.
5 De sign manageme nt
5.1 Objective

A particular organisation of the software design is necessary to ensure the complete

realisation of the main function according to its original specification.

This organisation should be defined by a software management plan which may be a clearly

identified part of a global design management plan.
5.2 Softw a re management pla n of the ma in functions

This plan is required for defining the management of the activities along the software

development lifecycle for the specification and the verification of the software related t o m ai n

functions (see 3.3).

The organisation should be defined with the roles and associated responsibilities for the

management (s tarting, controlling) and the execution of the activities.

It should be drawn up, documented and updated as necessary. It is intended to provide

measures for preventing incorrect s pecification, implementation, or modification issues.

The software management plan of the main functions should be adapted to the project.

In particular, the plan should:

a) identify the relevant design activities for the development of the parts related t o t he m ai n

functions (essential design activities and their organisation in appropriate se q u e n ce s a r e

illustrated in Figure 2);

b) describe the policy and strategy to fulfil the specified requi r em ent s r el at ed t o t he m ai n

functions;

c) describe the strategy for the development, integration, and verification which may inc l ude

conformity assessment;
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d) identify authorized persons, departments or other organisation units a n d res ourc es t hat

are responsible for carrying out and reviewing each of the main functions design activities;

the level of appropriat
...

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