oSIST prEN IEC 61508-1:2025

Functional safety of electrical/electronic/programmable electronic safety-related systems - Part 1: General requirements

Funktionale Sicherheit sicherheitsbezogener elektrischer/elektronischer/programmierbarer elektronischer Systeme - Teil 1: Allgemeine Anforderungen

Sécurité fonctionnelle des systèmes électriques/électroniques/électroniques programmables relatifs à la sécurité - Partie 1: Exigences générales

Funkcijska varnost električnih/elektronskih/elektronsko programirljivih varnostnih sistemov - 1. del: Splošne zahteve

General Information

• Status: Not Published
• Public Enquiry End Date: 29-Apr-2025
• ICS: 13.110 - Safety of machinery
• ICS: 25.040.40 - Industrial process measurement and control
• ICS: 29.020 - Electrical engineering in general
• ICS: 35.240.50 - IT applications in industry
• Technical Committee: MOV - Measuring equipment for electromagnetic quantities
• Current Stage: 4020 - Public enquire (PE) (Adopted Project)
• Start Date: 18-Feb-2025
• Due Date: 08-Jul-2025
• Ref Project: prEN IEC 61508-1:2025 - Functional safety of electrical/electronic/programmable electronic safety-related systems - Part 1: General requirements

Relations

• Revises: SIST EN 61508-1:2011 - Functional safety of electrical/electronic/programmable electronic safety-related systems - Part 1: General requirements (IEC 61508-1:2010)
• Effective Date: 23-Jan-2023
• Revises: SIST EN 61508-1:2011 - Functional safety of electrical/electronic/programmable electronic safety-related systems - Part 1: General requirements (IEC 61508-1:2010)
• Effective Date: 11-Oct-2022

Standards Content (Sample)

SLOVENSKI STANDARD
01-april-2025
Funkcijska varnost električnih/elektronskih/elektronsko programirljivih varnostnih
sistemov - 1. del: Splošne zahteve
Functional safety of electrical/electronic/programmable electronic safety-related systems
- Part 1: General requirements
Funktionale Sicherheit sicherheitsbezogener
elektrischer/elektronischer/programmierbarer elektronischer Systeme - Teil 1:
Allgemeine Anforderungen
Sécurité fonctionnelle des systèmes électriques/électroniques/électroniques
programmables relatifs à la sécurité - Partie 1: Exigences générales
Ta slovenski standard je istoveten z: prEN IEC 61508-1:2025
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.

65A/1164/CDV
COMMITTEE DRAFT FOR VOTE (CDV)

PROJECT NUMBER:
IEC 61508-1 ED3
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2025-02-14 2025-05-09
SUPERSEDES DOCUMENTS:
65A/1056A/CD, 65A/1075A/CC
IEC SC 65A : SYSTEM ASPECTS
SECRETARIAT: SECRETARY:
United Kingdom Ms Stephanie Lavy
OF INTEREST TO THE FOLLOWING COMMITTEES: HORIZONTAL FUNCTION(S):
TC 8,TC 9,TC 22,TC 31,TC 44,TC 45,TC 56,TC 61,TC
62,TC 65,SC 65B,SC 65C,SC 65E,TC 66,TC 72, TC
77,TC 80,TC 108,SyC AAL,SyC SM,SC 41
ASPECTS CONCERNED:
Safety
SUBMITTED FOR CENELEC PARALLEL VOTING NOT SUBMITTED FOR CENELEC PARALLEL VOTING
Attention IEC-CENELEC parallel voting
The attention of IEC National Committees, members of
CENELEC, is drawn to the fact that this Committee Draft
for Vote (CDV) is submitted for parallel voting.
The CENELEC members are invited to vote through the
CENELEC online voting system.
This document is still under study and subject to change. It should not be used for reference purposes.
Recipients of this document are invited to submit, with their comments, notification of any relevant patent rights of
which they are aware and to provide supporting documentation.
Recipients of this document are invited to submit, with their comments, notification of any relevant “In Some
Countries” clauses to be included should this proposal proceed. Recipients are reminded that the CDV stage is the
final stage for submitting ISC clauses. (SEE AC/22/2007 OR NEW GUIDANCE DOC).

TITLE:
Functional safety of electrical/electronic/programmable electronic safety-related systems - Part
1: General requirements
PROPOSED STABILITY DATE: 2028
NOTE FROM TC/SC OFFICERS:
download this electronic file, to make a copy and to print out the content for the sole purpose of preparing National
Committee positions. You may not copy or "mirror" the file or printed version of the document, or any part of it,
for any other purpose without permission in writing from IEC.

IEC CDV 61508-1 ED3 © IEC 2025 2 65A/1164/CDV
1 CONTENTS
3 FOREWORD . 5
4 INTRODUCTION . 7
5 1 Scope . 9
6 2 Normative references . 13
7 3 Definitions and abbreviations . 13
8 4 Conformance to this document . 13
9 5 Documentation . 14
10 5.1 Objectives . 14
11 5.2 Requirements . 14
12 6 Management of functional safety . 15
13 6.1 Objectives . 15
14 6.2 Requirements . 15
15 7 Overall safety lifecycle requirements . 19
16 7.1 General . 19
17 7.1.1 Introduction . 19
18 7.1.2 Objectives and requirements – general . 22
19 7.1.3 Objectives . 30
20 7.1.4 Requirements . 30
21 7.2 Concept . 30
22 7.2.1 Objective . 30
23 7.2.2 Requirements . 30
24 7.3 Overall scope definition. 31
25 7.3.1 Objectives . 31
26 7.3.2 Requirements . 31
27 7.4 Hazard and risk analysis . 31
28 7.4.1 Objectives . 32
29 7.4.2 Requirements . 32
30 7.5 Overall safety requirements . 33
31 7.5.1 Objective . 33
32 7.5.2 Requirements . 34
33 7.6 Overall safety requirements allocation . 35
34 7.6.1 Objectives . 35
35 7.6.2 Requirements . 35
36 7.7 Overall operation and maintenance planning . 40
37 7.7.1 Objective . 40
38 7.7.2 Requirements . 40
39 7.8 Overall safety validation planning . 41
40 7.8.1 Objective . 42
41 7.8.2 Requirements . 42
42 7.9 Overall installation and commissioning planning . 43
43 7.9.1 Objectives . 43
44 7.9.2 Requirements . 43
45 7.10 E/E/PE system safety requirements specification . 44
46 7.10.1 Objective . 44

IEC CDV 61508-1 ED3 © IEC 2025 3 65A/1164/CDV
47 7.10.2 Requirements . 44
48 7.11 E/E/PE safety-related systems – realisation . 46
49 7.11.1 Objective . 46
50 7.11.2 Requirements . 46
51 7.12 Other risk reduction measures – specification and realisation . 46
52 7.12.1 Objective . 46
53 7.12.2 Requirements . 46
54 7.13 Overall installation and commissioning. 46
55 7.13.1 Objectives . 47
56 7.13.2 Requirements . 47
57 7.14 Overall safety validation . 47
58 7.14.1 Objective . 47
59 7.14.2 Requirements . 47
60 7.15 Overall operation, maintenance and repair . 48
61 7.15.1 Objective . 48
62 7.15.2 Requirements . 48
63 7.16 Overall modification and retrofit . 51
64 7.16.1 Objective . 51
65 7.16.2 Requirements . 52
66 7.17 Decommissioning or disposal . 53
67 7.17.1 Objective . 53
68 7.17.2 Requirements . 54
69 7.18 Verification. 54
70 7.18.1 Objective . 54
71 7.18.2 Requirements . 54
72 8 Functional safety assessment . 55
73 8.1 Objective . 55
74 8.2 Requirements . 55
75 9 Functional safety audit. 58
76 9.1 Objective . 58
77 9.2 Requirements . 58
78 Annex A (informative) Example of a documentation structure . 60
79 A.1 General . 60
80 A.2 Safety lifecycle document structure . 61
81 A.3 Physical document structure . 64
82 Annex B (normative) Levels of independence for functional safety assurance activities . 66
83 B.1 General . 66
84 Bibliography . 68
86 Figure 1 – Overall framework of the IEC 61508 series . 12
87 Figure 2 – Overall safety lifecycle . 20
88 Figure 3 – E/E/PE system safety lifecycle (in realisation phase) . 21
89 Figure 4 – Software safety lifecycle (in realisation phase) . 21
90 Figure 5 – Relationship of the overall safety lifecycle to the E/E/PE system and
91 software safety lifecycles . 22
92 Figure 6 – Allocation of overall safety requirements to E/E/PE safety-related systems
93 and other risk reduction measures . 37
94 Figure 7 – Example of operations and maintenance activities model . 50

IEC CDV 61508-1 ED3 © IEC 2025 4 65A/1164/CDV
95 Figure 8 – Example of operation and
...