EN ISO 13577-4:2022

SLOVENSKI STANDARD
01-september-2022
Industrijske peči in pripadajoča procesna oprema - Varnost - 4. del: Zaščitni
sistemi (ISO 13577-4:2022)
Industrial furnaces and associated processing equipment - Safety - Part 4: Protective
systems (ISO 13577-4:2022)
Industrielle Thermoprozessanlagen und dazugehörige Prozesskomponenten -
Sicherheitsanforderungen - Teil 4: Schutzsysteme (ISO 13577-4:2022)
Fours industriels et équipements associés - Sécurité - Partie 4: Systèmes de protection
(ISO 13577-4:2022)
Ta slovenski standard je istoveten z: EN ISO 13577-4:2022
ICS:
25.180.01 Industrijske peči na splošno Industrial furnaces in general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 13577-4
EUROPEAN STANDARD
NORME EUROPÉENNE
July 2022
EUROPÄISCHE NORM
ICS 13.100; 25.180.01
English Version
Industrial furnaces and associated processing equipment -
Safety - Part 4: Protective systems (ISO 13577-4:2022)
Fours industriels et équipements associés - Sécurité - Industrielle Thermoprozessanlagen und dazugehörige
Partie 4: Systèmes de protection (ISO 13577-4:2022) Prozesskomponenten - Sicherheitsanforderungen - Teil
4: Schutzsysteme (ISO 13577-4:2022)
This European Standard was approved by CEN on 27 June 2022.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 13577-4:2022 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 13577-4:2022) has been prepared by Technical Committee ISO/TC 244
"Industrial furnaces and associated processing equipment" in collaboration with Technical Committee
CEN/TC 186 “Industrial thermoprocessing - Safety” the secretariat of which is held by DIN.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by January 2023, and conflicting national standards shall
be withdrawn at the latest by January 2023.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
Any feedback and questions on this document should be directed to the users’ national standards
body/national committee. A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the
United Kingdom.
Endorsement notice
The text of ISO 13577-4:2022 has been approved by CEN as EN ISO 13577-4:2022 without any
modification.
INTERNATIONAL ISO
STANDARD 13577-4
Second edition
2022-07
Industrial furnaces and associated
processing equipment — Safety —
Part 4:
Protective systems
Fours industriels et équipements associés — Sécurité —
Partie 4: Systèmes de protection
Reference number
ISO 13577-4:2022(E)
ISO 13577-4:2022(E)
© ISO 2022
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii
ISO 13577-4:2022(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Design requirements for equipment in a protective system . 4
4.1 General . 4
4.2 Requirements for protective systems . 6
4.2.1 Overview of methods . 6
4.2.2 Method A . . . 7
4.2.3 Method BC . 8
4.2.4 Method D . 10
4.3 Fault assessment for the wired section of protective systems. 11
4.4 Failure of utilities . 12
4.5 Reset . 12
5 Information for use .12
Annex A (informative) Explanation of techniques and measures for avoiding systematic
faults .13
Annex B (normative) Wiring of protective systems .15
Annex C (informative) Examples for the determination of safety integrity level (SIL) or
performance level (PL) using the risk graph method .29
Annex D (informative) Example of a risk assessment for one safety instrumented function
using the method according to the IEC 61511:2016 series .45
Annex E (informative) Examples for protective functions .53
Annex F (normative) Requirements for application software .82
Bibliography .84
iii
ISO 13577-4:2022(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to
the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see
www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 244, Industrial furnaces and associated
processing equipment, in collaboration with the European Committee for Standardization (CEN)
Technical Committee CEN/TC 186, Industrial thermoprocessing - Safety, in accordance with the
Agreement on technical cooperation between ISO and CEN (Vienna Agreement).
This second edition cancels and replaces the first edition (ISO 13577-4:2014), which has been technically
revised.
The main changes are as follows:
— to provided better clarity methods B and C were combined to create a new method BC,
— Annex E was rewritten to provide several new examples to better reflect the intent for previously
misunderstood elements,
— Annex B was modified to include clearer language and examples of normative wiring. The original
Annex F was merged,
— created wording to provide a better alignment with IEC 62061, IEC 61511, and ISO 13849-1.
A list of all parts in the ISO 13577 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
iv
ISO 13577-4:2022(E)
Introduction
This document was developed to specify the requirements of a protective system, which is a safety-
related control system (SCS) of industrial furnaces and associated processing equipment (TPE). It is
intended that in designing the protective system of TPE, manufacturers of TPE choose from the three
methods provided in this document. Requirements for safety-related control functions of TPE are
specified in ISO 13577-1, ISO 13577-2, and ISO 13577-3.
This document is intended to be used jointly with ISO 13577-1, ISO 13577-2 and ISO 13577-3. Since the
other parts of the ISO 13577 series are type-C stand
...