Functional safety of electrical/electronic/programmable electronic safety-related systems - Part 3-1: Software requirements - Reuse of pre-existing software elements to implement all or part of a safety function

IEC TS 61508-3-1:2016(E) presents requirements by the application of which pre-existing software elements may be claimed to be proven-in-use for all or a part of safety function(s) of SIL1 or SIL2.

General Information

Status
Published
Publication Date
12-Jul-2016
Technical Committee
Current Stage
PPUB - Publication issued
Completion Date
13-Jul-2016
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IEC TS 61508-3-1:2016 - Functional safety of electrical/electronic/programmable electronic safety-related systems - Part 3-1: Software requirements - Reuse of pre-existing software elements to implement all or part of a safety function
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IEC TS 61508-3-1
Edition 1.0 2016-07
TECHNICAL
SPECIFICATION

Functional safety of electrical/electronic/programmable electronic safety-related

systems –
Part 3-1: Software requirements – Reuse of pre-existing software elements to
implement all or part of a safety function
IEC TS 61508-3-1:2016-07(en)
---------------------- Page: 1 ----------------------
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IEC TS 61508-3-1
Edition 1.0 2016-07
TECHNICAL
SPECIFICATION

Functional safety of electrical/electronic/programmable electronic safety-related

systems –
Part 3-1: Software requirements – Reuse of pre-existing software elements to
implement all or part of a safety function
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 25.040.40; 35.240.50 ISBN 978-2-8322-3516-4

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

® Registered trademark of the International Electrotechnical Commission
---------------------- Page: 3 ----------------------
– 2 – IEC TS 61508-3-1:2016 © IEC 2016
CONTENTS

FOREWORD ......................................................................................................................... 3

INTRODUCTION ................................................................................................................... 5

1 Scope ............................................................................................................................ 6

2 Normative References ................................................................................................... 6

3 Terms and definitions .................................................................................................... 6

4 Requirements ................................................................................................................ 6

Bibliography ....................................................................................................................... 10

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IEC TS 61508-3-1:2016 © IEC 2016 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FUNCTIONAL SAFETY OF ELECTRICAL/ELECTRONIC/PROGRAMMABLE
ELECTRONIC SAFETY-RELATED SYSTEMS –
Part 3-1: Software requirements –
Reuse of pre-existing software elements
to implement all or part of a safety function
FOREWORD

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The main task of IEC technical committees is to prepare International Standards. In

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Technical specifications are subject to review within three years of publication to decide

whether they can be transformed into International Standards.
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– 4 – IEC TS 61508-3-1:2016 © IEC 2016

IEC TS 61508-3-1, which is a technical specification, has been prepared by subcommittee

65A: System aspects, of IEC technical committee 65: Industrial-process measurement, control

and automation.
The text of this technical specification is based on the following documents:
Enquiry draft Report on voting
65A/780/DTS 65A/802/RVC

Full information on the voting for the approval of this technical specification 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 parts in the IEC 61508 series, published under the general title Functional safety

of electrical/electronic/programmable electronic safety-related systems, 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
• transformed into an International standard,
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
A bilingual version of this publication may be issued at a later date.
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IEC TS 61508-3-1:2016 © IEC 2016 – 5 –
INTRODUCTION

The requirements set out in this technical specification deal with the reuse of software

elements when they are intended to form part of a safety function.

In many fields of automation, software elements are used today in support of safety functions.

Such applications will certainly be further developed and extended. Software engineers,

however, do not always wish to write the software for these applications from scratch, but will

in many cases use already existing software and integrate it with the new application which

might be slightly different from the one for which the software was originally specified.

In IEC 61508-3:2010, a requirement is given in 7.4.2.12. It offers three routes to the

achievement of the necessary integrity for the pre-existing software element. The

requirements to compl
...

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