IEC 62061:2021/AMD1:2024
(Amendment)Amendment 1 - Safety of machinery - Functional safety of safety-related control systems
Amendment 1 - Safety of machinery - Functional safety of safety-related control systems
Amendement 1 - Sécurité des machines - Sécurité fonctionnelle des systèmes de commande relatifs à la sécurité
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IEC 62061 ®
Edition 2.0 2024-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
AMENDMENT 1
AMENDEMENT 1
Safety of machinery – Functional safety of safety-related control systems
Sécurité des machines – Sécurité fonctionnelle des systèmes de commande
relatifs à la sécurité
IEC 62061:2021-03/AMD1:2024-03(en-fr)
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IEC 62061 ®
Edition 2.0 2024-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
AMENDMENT 1
AMENDEMENT 1
Safety of machinery – Functional safety of safety-related control systems
Sécurité des machines – Sécurité fonctionnelle des systèmes de commande
relatifs à la sécurité
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 13.110, 25.040.99, 29.020 ISBN 978-2-8322-8509-1
– 2 – IEC 62061:2021/AMD1:2024
© IEC 2024
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
SAFETY OF MACHINERY –
FUNCTIONAL SAFETY OF SAFETY-RELATED CONTROL SYSTEMS
AMENDMENT 1
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, Technical Specifications, 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 interested in the subject dealt with
may participate in this preparatory work. International, governmental and non-governmental organizations liaising
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Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.
2) The formal 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 committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
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Amendment 1 to IEC 62061:2021 has been prepared by IEC technical committee 44: Safety of
machinery – Electrotechnical aspects.
The text of this Amendment is based on the following documents:
Draft Report on voting
44/1020/FDIS 44/1024/RVD
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this Amendment is English.
© IEC 2024
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/publications/.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
• reconfirmed,
• withdrawn, or
• revised.
____________
1 Scope
th rd
Replace, in the 6 paragraph, 3 dash, "IEC TR 63074" with "IEC TS 63074".
3.2.52
dangerous failure
Replace, in the source, "IEC 61508-4:2010, 3.6.4, modified – terminology adapted to machinery
and figure replaced by textual description and ISO 12100-1:2010, 3.34" with
"IEC 61508-4:2010, 3.6.7, modified – Terminology adapted to machinery".
4.2 Design process
Replace, in NOTE 1, "Annex H" with "Annex G".
6.5.2 Requirements for the control of systematic faults
Replace, in NOTE 2, "IEC 61784-3:2016" with "IEC 61784-3:2021".
6.8 Security aspects
Replace, in NOTE 2, "IEC TR 63074" with "IEC TS 63074".
Replace, in NOTE 2, "ISO/IEC 27001:2013" with "ISO/IEC 27001:2022".
– 4 – IEC 62061:2021/AMD1:2024
© IEC 2024
7.3.3.3 Fault exclusion
st
Replace, in the 1 NOTE, "NOTE" with "NOTE 1".
nd
Replace, in the 2 NOTE, "NOTE" with "NOTE 2".
7.3.4.2 Relationship of relevant parameters
th
Add, after the 11 paragraph (starting with "If the ratio of dangerous failure is estimated less
than 0,5"), the following new note and text:
B
NOTE 5 Similar to Formula (11), T is evaluated by .
T =
10 10
n
op
For further details, see IEC TS 63394:2023, Clause H.6.
Table 6 – Architectural constraints on a subsystem: maximum SIL that can be claimed
for an SCS using the subsystem
Replace, in NOTE 3, "7.4.3.2" with "7.5.3".
7.4.2 Estimation of safe failure fraction (SFF)
st
Replace, in the 1 paragraph, item b), "component failure data" with "failure rate data".
th
Replace, in the 4 paragraph, Formula (13) with the following new formula:
∑λλ+∑ ∑λ
S DD DD
SFF ≈
(13)
∑λλ+∑ ∑λ
SD D
th
Replace, in the 4 paragraph, "EXAMPLE 2" with "EXAMPLE 1".
th
Replace, in the 4 paragraph, the formula of the first EXAMPLE with the following:
λ DC λ
DD1 1 D1
SFF≈= DC
λλ
D1 D1
th
Replace, in the 4 paragraph, "EXAMPLE 3" with "EXAMPLE 2".
th nd
Replace, in the 4 paragraph, the formula of 2 EXAMPLE with the following:
DC DC
+
λ ++ λ DC λ DC λ MTTF MTTF
DD1 DD2 1 D1 2 D2 D1 D2
SFF≈=
λλ + λ +λ
D1 D2 D1 D2
+
MTTF MTTF
D1 D2
=
=
=
© IEC 2024
7.4.3.3 Diagnostic coverage (DC)
st
Replace, in 1 paragraph, Formula (14) with the following:
∑λ
DD
DC=
(14)
∑λ
D
Figure 8 – Subsystem A logical representation
Replace, in the title, "Subsystem" with "Basic subsystem architecture".
Figure 9 – Subsystem B logical representation
Replace, in the title, "Subsystem" with "Basic subsystem architecture".
Figure 10 – Subsystem C logical representation
Replace, in the title, "Subsystem" with "Basic subsystem architecture".
Figure 11 – Subsystem D logical representation
Replace, in the title, "Subsystem" with "Basic subsystem architecture".
8.4.1.2 Software safety lifecycle model – SW level 2
Replace, in the last sentence of the 2nd paragraph, "9.5.3" with "9.5.4".
– 6 – IEC 62061:2021/AMD1:2024
© IEC 2024
Figure 14 – V-model of software safety lifecycle for SW level 2
Replace Figure 14 with the following new figure:
A.2.4.2 Frequency and duration of exposure
rd st
Delete, in the 3 paragraph, 1 sentence, the text "(referred to a period ≥ to one year)".
Table A.6 – Matrix assignment for determining the required SIL (or PL ) for a safety
r
function
Renumber the last "NOTE 3" as "NOTE 4".
B.4.2.4.2 Annex H approaches
nd
Replace, in the 2 dash, "T = 1/C = n /8 760 h" with
2 op
"T = 1 / C = 8 760 h / n ".
2 op
B.4.4.2.2 Annex H approaches
nd
Replace, in the 2 dash, "T = 1/C = n /8 760 h" with
2 op
"T = 1 / C = 8 760 h / n ".
2 op
B.4.5.1 Target
Replace "6.4.2" with "6.4.1".
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