Functional safety - Safety instrumented systems for the process industry sector - Part 4: Explanation and rationale for changes in IEC 61511-1 from Edition 1 to Edition 2

IEC TR 61511-4:2020(E), Functional safety - safety instrumented systems for the process industry sector, which is a Technical Report:
• specifies the rationale behind all clauses and the relationship between them,
• raises awareness for the most common misconceptions and misinterpretations of the clauses and the changes related to them,
• explains the differences between Ed. 1 and Ed. 2 of IEC 61511-1 and the reasons behind the changes,
• presents high level summaries of how to fulfil the requirements of the clauses, and
• explains differences in terminology between IEC 61508-4:2010 and IEC 61511-1 Ed. 2.

General Information

Status
Published
Publication Date
18-Feb-2020
Technical Committee
Current Stage
PPUB - Publication issued
Start Date
20-Feb-2020
Completion Date
19-Feb-2020
Ref Project

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IEC TR 61511-4:2020 - Functional safety - Safety instrumented systems for the process industry sector - Part 4: Explanation and rationale for changes in IEC 61511-1 from Edition 1 to Edition 2
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IEC TR 61511-4
®

Edition 1.0 2020-02
TECHNICAL
REPORT



Functional safety – Safety instrumented systems for the process industry
sector –
Part 4: Explanation and rationale for changes in IEC 61511-1 from Edition 1 to
Edition 2
IEC TR 61511-4:2020-02(en)

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IEC TR 61511-4

®


Edition 1.0 2020-02




TECHNICAL



REPORT



















Functional safety – Safety instrumented systems for the process industry

sector –

Part 4: Explanation and rationale for changes in IEC 61511-1 from Edition 1 to


Edition 2
























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ELECTROTECHNICAL


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ICS 13.110, ICS 25.040.01 ISBN 978-2-8322-7870-3




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– 2 – IEC TR 61511-4:2020 © IEC 2020
CONTENTS
CONTENTS . 2
FOREWORD . 5
INTRODUCTION . 7
1 Scope . 8
2 Normative references . 8
3 Terms, definitions and abbreviated terms . 8
3.1 Terms and definitions . 8
3.2 Abbreviated terms . 9
4 Background . 10
5 Management of functional safety (IEC 61511-1 Ed. 2 Clause 5) . 10
5.1 Why is this clause important? . 10
5.2 Common misconceptions .
...

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