SIST EN IEC 61500:2019

Nuclear power plants - Instrumentation and control systems important to safety - Data communication in systems performing category A functions (IEC 61500:2018 )

See the scope of the revised IEC 60709 in 45A/1113/CDV that was unchanged for the preparation of the proposal of FDIS to be circulated in parallel in CENELEC.

Kernkraftwerke - Leittechnische Systeme mit sicherheitstechnischer Bedeutung - Datenkommunikation in Systemen, die Funktionen der Kategorie A ausführen (IEC 61500:2018 )

Centrales nucléaires de puissance - Systèmes d'instrumentation et de contrôle-commande importants pour la sûreté - Communications de données dans les systèmes réalisant des fonctions de catégorie A (IEC 61500:2018 )

NEW!IEC 61500:2018 est disponible sous forme de IEC 61500:2018 RLV qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente.

L'IEC 61500:2018 établit des exigences applicables à la communication de données assurée pour des systèmes réalisant des fonctions de catégorie A dans les centrales nucléaires de puissance. Cela comprend aussi les exigences relatives aux interfaces des équipements de communication de données assurant des fonctions de catégorie A, avec les autres systèmes y compris ceux qui assurent des fonctions de catégories B et C, ainsi que des fonctions non importantes pour la sûreté. Ce document fournit des exigences pour les fonctions et les propriétés afférentes à la communication de données en faisant référence aux IEC 60880 et IEC 60987, qui ont été développées sous couvert de l’IEC 61513. Cela implique que les fonctions de communication soient classées conformément à l’IEC 61226. Les principales modifications techniques par rapport à l'édition précédente sont les suivantes:
- les modifications introduites dans les normes précédemment référencées sont applicables;
- des normes pertinentes récemment publiées sont référencées;
- le retour d’expérience obtenu au niveau de plusieurs applications industrielles a été pris en compte.

Jedrske elektrarne - Merilna in nadzorna oprema za zagotavljanje varnosti - Podatkovne komunikacije v sistemih, ki izvajajo funkcije kategorije A (IEC 61500:2018 )

Ta dokument določa zahteve za podatkovno komunikacijo v sistemih, ki v jedrskih elektrarnah izvajajo funkcije kategorije A.
Zajema tudi zahteve po vmesniku za podatkovno komunikacijo opreme, ki izvaja funkcije kategorije A z drugimi sistemi, vključno s tistimi, ki opravljajo funkcije kategorij B in C ter funkcije, ki niso pomembne za varnost.
Področje uporabe tega dokumenta je omejeno na podatkovno komunikacijo znotraj varnostnih sistemov merilne in nadzorne opreme elektrarne. Ne zajema komunikacije po telefonu, radiu, faksu, e-pošti, glasovne komunikacije, javnega obveščanja itd.
Na področje uporabe tega dokumenta ne spadajo notranje delovanje in podrobne tehnične specifikacije opreme za podatkovno komunikacijo. Ta dokument se ne uporablja za notranje povezave in podatkovno komunikacijo procesorske enote, njenega pomnilnika in logiko nadzora.
Ne obravnava notranje obdelave merilnih in nadzornih računalniških sistemov.
Ta dokument določa zahteve za funkcije in lastnosti spletne podatkovne komunikacije elektrarne s sklicevanjem na standarda IEC 60880 in IEC 60987, pripravljena v okviru standarda IEC 61513. Zahteva razvrstitev komunikacijskih funkcij v skladu s standardom IEC 61226, kar posledično zahteva okoljsko in potresno ustreznost (tj. okolje, v katerem deluje varnostna funkcija) v skladu s standardoma IEC/IEEE 60780-323 in IEC 60980.

General Information

• Status: Published
• Publication Date: 11-Aug-2019
• ICS: 27.120.20 - Nuclear power plants. Safety
• Technical Committee: I09 - Imaginarni 09
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 05-Jul-2019
• Due Date: 09-Sep-2019
• Completion Date: 12-Aug-2019
• Ref Project: EN IEC 61500:2019 - Nuclear power plants - Instrumentation and control systems important to safety – Data communication in systems performing category A functions

Relations

• Replaces: SIST EN 61500:2011 - Nuclear power plants - Instrumentation and control systems important to safety - Data communication in systems performing A functions
• Effective Date: 02-Jul-2019
• Revised: SIST EN 61500:2011 - Nuclear power plants - Instrumentation and control systems important to safety - Data communication in systems performing A functions
• Effective Date: 27-Mar-2018

Overview

EN IEC 61500:2019 (IEC 61500:2018) - "Nuclear power plants - Instrumentation and control systems important to safety - Data communication in systems performing category A functions" - defines requirements and guidance for data communication used in I&C systems performing the highest safety classification (Category A) in nuclear power plants. Adopted by CENELEC and published as EN IEC 61500:2019, this third edition updates and consolidates technical guidance on selecting, implementing and qualifying data communication techniques without adding new functional safety requirements.

Key topics and requirements

EN IEC 61500:2019 addresses the technical and organizational topics critical to safe data communication in nuclear I&C systems:

• Principles for selection of communication techniques and equipment - guidance on choosing appropriate technologies for safety-related data paths.
• Functional and performance requirements - expectations for timely, reliable and deterministic data exchange within and between safety divisions.
• Electrical isolation and physical separation - rules to prevent unwanted coupling and maintain safety boundaries.
• Functional independence - measures to ensure communication does not compromise separation of safety channels.
• Reliability, self-supervision and failure mitigation - detection of communication errors, response strategies and provisions to minimize single failures or common-cause failures (CCF).
• Testing, qualification and maintenance - requirements for qualification programs, surveillance testing and controlled modification/maintenance.
• Cybersecurity considerations - integration of security measures relevant to safety-related communications.

Sections and clauses (e.g., 5–10) cover general requirements, isolation/separation, independence, reliability, qualification and lifecycle activities. The standard is intended to be used in conjunction with IEC 61513 (general I&C requirements), IEC 60880 (software), and IEC 60987 (hardware).

Applications and users

EN IEC 61500:2019 is practical for professionals involved in the lifecycle of nuclear safety I&C systems:

• Nuclear utilities and plant operators - design reviews, procurement specs and operational procedures for safety communication networks.
• Manufacturers and system integrators - product development, verification and qualification of communication equipment for Category A systems.
• System evaluators, licensors and regulators - assessment, safety case preparation and conformity evaluation.
• Maintenance and cybersecurity teams - guidance for testing, change control and secure operation of data links.

Use cases include design of redundant communication links between safety divisions, qualification of digital communication equipment, and defining interfaces to systems of lower safety significance.

Related standards

EN IEC 61500 references and is intended to be read alongside relevant nuclear I&C and qualification standards, for example: IEC 61513, IEC 60880, IEC 60987, IEC 60709, IEC 60671, IEC/IEEE 60780-323, and guidance such as IAEA SSG-39. These references help align communication requirements with software, hardware, EMC, qualification and CCF practices.

Keywords: EN IEC 61500:2019, IEC 61500, data communication, nuclear power plants, instrumentation and control, category A functions, safety, I&C, qualification, cybersecurity.

Standards Content (Sample)

SLOVENSKI STANDARD
01-september-2019
Nadomešča:
SIST EN 61500:2011
Jedrske elektrarne - Merilna in nadzorna oprema za zagotavljanje varnosti -
Podatkovne komunikacije v sistemih, ki izvajajo funkcije kategorije A (IEC
61500:2018 )
Nuclear power plants - Instrumentation and control systems important to safety - Data
communication in systems performing category A functions (IEC 61500:2018 )
Kernkraftwerke - Leittechnische Systeme mit sicherheitstechnischer Bedeutung -
Datenkommunikation in Systemen, die Funktionen der Kategorie A ausführen (IEC
61500:2018 )
Centrales nucléaires de puissance - Systèmes d'instrumentation et de contrôle-
commande importants pour la sûreté - Communications de données dans les systèmes
réalisant des fonctions de catégorie A (IEC 61500:2018 )
Ta slovenski standard je istoveten z: EN IEC 61500:2019
ICS:
27.120.20 Jedrske elektrarne. Varnost Nuclear power plants. Safety
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN IEC 61500

NORME EUROPÉENNE
EUROPÄISCHE NORM
June 2019
ICS 27.120.20 Supersedes EN 61500:2011
English Version
Nuclear power plants - Instrumentation and control systems
important to safety - Data communication in systems performing
category A functions
(IEC 61500:2018)
Centrales nucléaires de puissance - Systèmes Kernkraftwerke - Leittechnische Systeme mit
d'instrumentation et de contrôle-commande importants pour sicherheitstechnischer Bedeutung - Datenkommunikation in
la sûreté - Communications de données dans les systèmes Systemen, die Funktionen der Kategorie A ausführen
réalisant des fonctions de catégorie A (IEC 61500:2018)
(IEC 61500:2018)
This European Standard was approved by CENELEC on 2019-06-17. CENELEC 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 CENELEC 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 CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2019 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 61500:2019 E
European foreword
This document (EN IEC 61500:2019) consists of the text of IEC 61500:2018 prepared by IEC/SC
45A: "Instrumentation, control and electrical power systems of nuclear facilities", of IEC/TC 45:
"Nuclear instrumentation".
The following dates are fixed:
• latest date by which this document has to be (dop) 2020-06-17
implemented at national level by publication of an
identical national standard or by endorsement
• latest date by which the national standards (dow) 2022-06-17
conflicting with this document have to be
withdrawn
This document supersedes EN 61500:2011.
As stated in the nuclear safety directive 2009/71/EURATOM, Chapter 1, Article 2, item 2, Member
States are not prevented from taking more stringent safety measures in the subject-matter covered by
the Directive, in compliance with Community law. In a similar manner, this European standard does
not prevent Member States from taking more stringent nuclear safety and/or security measures in the
subject-matter covered by this standard.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
Endorsement notice
The text of the International Standard IEC 61500:2018 was approved by CENELEC as a European
Standard without any modification.

Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following documents are referred to in the text in such a way that some or all of their

content constitutes requirements of this document. For dated references, only the edition
cited applies. For undated references, the latest edition of the referenced document
(including any amendments) applies.
NOTE 1 When an International Publication has been modified by common modifications, indicated by (mod), the relevant

EN/HD applies.
NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available here:
www.cenelec.eu.
Publication Year Title EN/HD Year

IEC 60671 2007 Nuclear power plants - Instrumentation EN 60671 2011
and control systems important to safety -
Surveillance testing
IEC 60709 -  Nuclear power plants - Instrumentation EN 60709 -
and control systems important to safety -
Separation
IEC/IEEE 60780- 2016 Nuclear facilities - Electrical equipment EN 60780-323 2017
323 important to safety - Qualification
IEC 60880 2006 Nuclear power plants - Instrumentation EN 60880 2009
and control systems important to safety -
Software aspects for computer-based
systems performing category A functions
IEC 60980 -  Recommended practices for seismic - -
qualification of electrical equipment of the
safety system for nuclear generating
stations
IEC 60987 2007 Nuclear power plants - Instrumentation EN 60987 2015
and control important to safety - Hardware
design requirements for computer-based
systems
+ A1 2013  - -
IEC 61000 series Electromagnetic compatibility (EMC) EN 61000 series
IEC 61513 -  Nuclear power plants - Instrumentation EN 61513 -
and control important to safety - General
requirements for systems
IEC 62003 -  Nuclear power plants - Instrumentation - -
and control important to safety -
Requirements for electromagnetic
compatibility testing
IEC 62340 2007 Nuclear power plants - Instrumentation EN 62340 2010
and control systems important to safety -
Requirements for coping with common
cause failure (CCF)
IEC 62566 2012 Nuclear power plants - Instrumentation EN 62566 2014
and control important to safety -
Development of HDL-programmed
integrated circuits for systems performing
category A functions
IEC 62645 2014 Nuclear power plants - Instrumentation - -
and control systems – Requirements for
security programmes for computer-based
systems
IEC 62859 - Nuclear power plants - Instrumentation - -
and control systems - Requirements for
coordinating safety and cybersecurity
IAEA safety guide 2016 Design of instrumentation and control
No. SSG-39 systems for nuclear power plants

IEC 61500 ®
Edition 3.0 2018-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Nuclear power plants – Instrumentation and control systems important to

safety – Data communication in systems performing category A functions

Centrales nucléaires de puissance – Systèmes d’instrumentation et de contrôle-

commande importants pour la sûreté – Communications de données dans les

systèmes réalisant des fonctions de catégorie A

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 27.120.20 ISBN 978-2-8322-5583-4

– 2 – IEC 61500:2018  IEC 2018

CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 8
4 Symbols and abbreviated terms . 10
5 General requirements . 10
5.1 Principles of selection of data communication techniques and equipment . 10
5.2 Functional requirements . 10
5.3 Performance requirements . 11
5.4 Communication within and between division . 11
5.5 Interfaces to systems of lower importance to safety . 11
6 Electrical isolation and physical separation . 12
6.1 Electrical isolation . 12
6.2 Physical separation . 12
7 Functional independence . 12
8 Reliability . 13
8.1 Self-supervision and failure mitigation . 13
8.1.1 Communication error detection . 13
8.1.2 Response to failure . 13
8.2 Testing . 14
8.3 Prevention of failures (including CCF) . 14
8.4 Cybersecurity . 15
9 Qualification . 15
10 Maintenance and modification . 15
Bibliography . 16

IEC 61500:2018  IEC 2018 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
NUCLEAR POWER PLANTS –
INSTRUMENTATION AND CONTROL SYSTEMS IMPORTANT TO SAFETY –
DATA COMMUNICATION IN SYSTEMS PERFORMING
CATEGORY A FUNCTIONS
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 with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for 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
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 61500 has been prepared by subcommittee 45A: Instrumentation,
control and electrical power systems of nuclear facilities, of IEC technical committee 45:
Nuclear instrumentation.
This third edition cancels and replaces the second edition published in 2009. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) the changes introduced to previously referenced standards have been confirmed to apply;
b) relevant newly published standards have been referenced;
c) lessons learned from several industrial applications have been incorporated.

– 4 – IEC 61500:2018  IEC 2018
The text of this standard is based on the following documents:
FDIS Report on voting
45A/1183/FDIS 45A/1194/RVD
Full information on the voting for the approval of this standard 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.
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
IEC 61500:2018  IEC 2018 – 5 –
INTRODUCTION
a) Technical background, main issues and organization of the standard
The equipment for data communication of on-line plant data can simplify the hardwired cables
connecting distributed systems for instrumentation, control, protection and monitoring needed
for the safe operation of Nuclear Power Plants (NPP). Such communication systems can have
advantages over direct cables, for electrical isolation, for reduction of cable fire loads or other
reasons. In a distributed computer based system, communication equipment is an essential
part of the system. Data communication is usually essential for implementing I&C systems
important to safety in nuclear power plants.
It is intended that the document be used by operators of NPPs (utilities), manufacturers of
data communication equipment, systems evaluators and by licensors.
b) Situation of the current standard in the structure of the IEC SC 45A standard series
IEC 61500 is the third level IEC SC 45A document tackling the generic issue of data
communication for equipment performing category A functions.
IEC 61500 is to be read in association with IEC 61513, which is the appropriate IEC SC 45A
document providing guidance on general requirements for instrumentation and control
systems important to safety, IEC 60880, which is the appropriate IEC SC 45A document
providing guidance on software aspects for computer based systems performing category A
functions, and IEC 60987 which is the appropriate IEC SC 45A document providing guidance
on hardware aspects for computer based systems.
For more details on the structure of the IEC SC 45A standard series, see item d) of this
introduction.
c) Recommendations and limitations regarding the application of the standard
It is important to note that this standard establishes no additional functional requirements for
safety systems.
Aspects for which special recommendations have been provided in this standard are:
• Requirements for data communication within systems performing category A functions.
• Requirements for data communication between divisions of a system performing
category A functions.
• Requirements for data communication of systems performing category A functions with
systems of lower safety importance.
• Reliability requirements for data communication.
To ensure that the standard will continue to be relevant in future years, emphasis is placed on
principles, rather than on specific technologies.
d) Description of the structure of the IEC SC 45A standard series and relationships
with other IEC documents and other bodies documents (IAEA, ISO)
The top-level documents of the IEC SC 45A standard series are IEC 61513 and IEC 63046.
IEC 61513 provides general requirements for I&C systems and equipment that are used to
perform functions important to safety in NPP. IEC 63046 provides general requirements for
electrical power systems of NPP; it covers power supply systems including the supply
systems of the I&C systems. IEC 61513 and IEC 63046 are to be considered in conjunction
and at the same level. IEC 61513 and IEC 63046 structure the IEC SC 45A standard series
and shape a complete framework establishing general requirements for instrumentation,
control and electrical systems for nuclear power plants.

– 6 – IEC 61500:2018  IEC 2018
IEC 61513 and IEC 63046 refer directly to other IEC SC 45A standards for general topics
related to categorization of functions and classification of systems, qualification, separation,
defence against common cause failure, control room design, electromagnetic compatibility,
cybersecurity, software and hardware aspects for programmable digital systems, coordination
of safety and security requirements and management of ageing. The standards referenced
directly at this second level should be considered together with IEC 61513 and IEC 63046 as
a consistent document set.
At a third level, IEC SC 45A standards not directly referenced by IEC 61513 or by IEC 63046
are standards related to specific equipment, technical methods, or specific activities. Usually
these documents, which make reference to second-level documents for general topics, can be
used on their own.
A fourth level extending the IEC SC 45A standard series, corresponds to the Technical
Reports which are not normative.
The IEC SC 45A standard series consistently implements and details the safety and security
principles and basic aspects provided in the relevant IAEA safety standards and in the
relevant documents of the IAEA nuclear security series (NSS). In particular this includes the
IAEA requirements SSR-2/1, establishing safety requirements related to the design of nuclear
power plants, the IAEA safety guide SSG-30 dealing with the safety classification of
structures, systems and components in NPP, the IAEA safety guide SSG-39 dealing with the
design of instrumentation and control systems for NPPs, the IAEA safety guide SSG-34
dealing with the design of electrical power systems for NPPs and the implementing guide
NSS17 for computer security at nuclear facilities. The safety and security terminology and
definitions used by the IEC SC 45A standards are consistent with those used by the IAEA.
IEC 61513 and IEC 63046 have adopted a presentation format similar to the basic safety
publication IEC 61508 with an overall life-cycle framework and a system life-cycle framework.
Regarding nuclear safety, IEC 61513 and IEC 63046 provide the interpretation of the general
requirements of IEC 61508-1, IEC 61508-2 and IEC 61508-4, for the nuclear application
sector. In this framework IEC 60880, IEC 62138 and IEC 62566 correspond to IEC 61508-3
for the nuclear application sector. IEC 61513 and IEC 63046 refer to ISO as well as to IAEA
GS-R-3 and IAEA GS-G-3.1 and IAEA GS-G-3.5 for topics related to quality assurance (QA).
At level 2, regarding nuclear security, IEC 62645 is the entry document for the IEC SC 45A
security standards. It builds upon the valid high level principles and main concepts of the
generic security standards, in particular ISO/IEC 27001 and ISO/IEC 27002; it adapts them
and completes them to fit the nuclear context and coordinates with the IEC 62443 series. Also
at level 2, IEC 60964 is the entry document for the IEC SC 45A control rooms standards and
IEC 62342 is the entry document for the IEC SC 45A ageing management standards.
NOTE 1 It is assumed that for the design of I&C systems in NPPs that implement conventional safety functions
(e.g. to address worker safety, asset protection, chemical hazards, process energy hazards) international or
national standards would be applied.
NOTE 2 IEC SC 45A domain was extended in 2013 to cover electrical systems. In 2014 and 2015 discussions
were held in IEC SC 45A to decide how and where general requirements for the design of electrical systems were
to be considered. IEC SC 45A experts recommended that an independent standard be developed at the same level
as IEC 61513 to establish general requirements for electrical systems. Project IEC 63046 is now launched to cover
this objective. When IEC 63046 will be published this NOTE 2 of the introduction of IEC SC 45A standards will be
suppressed.
IEC 61500:2018  IEC 2018 – 7 –
NUCLEAR POWER PLANTS –
INSTRUMENTATION AND CONTROL SYSTEMS IMPORTANT TO SAFETY –
DATA COMMUNICATION IN SYSTEMS PERFORMING
CATEGORY A FUNCTIONS
1 Scope
This document establishes requirements for data communication which is used in systems
performing category A functions in nuclear power plants.
It covers also interface requirements for data communication of equipment performing
category A functions with other systems including those performing category B and C
functions and functions not important to safety.
The scope of this document is restricted to the consideration of data communication within the
plant I&C safety systems. It does not cover communication by telephone, radio, voice, fax,
email, public address, etc.
The internal operation and the detailed technical specification of data communication
equipment are not in the scope of this document. This document is not applicable to the
internal connections and data communication of a p
...