SIST EN IEC 62541-15:2025
(Main)OPC Unified Architecture - Part 15: Safety
OPC Unified Architecture - Part 15: Safety
IEC 62541-15:2025 describes a safety communication layer (services and a protocol) for the exchange of SafetyData using IEC 62541 mechanisms. It identifies the principles for functional safety communications defined in IEC 61784‑3 that are relevant for this safety communication layer. This safety communication layer is intended for implementation in safety devices only.
NOTE 1 This document targets controller-to-controller communication. However, easy expandability to other use-cases (e.g. OPC UA field level communication) has already been considered in the design of this document.
NOTE 2 This document does not cover electrical safety and intrinsic safety aspects. Electrical safety relates to hazards such as electrical shock. Intrinsic safety relates to hazards associated with potentially explosive atmospheres.
This document defines mechanisms for the transmission of safety-relevant messages among participants within a network using OPC UA technology in accordance with the requirements of the IEC 61508 series and IEC 61784-3 for functional safety. These mechanisms can be used in various industrial applications such as process control, manufacturing, automation, and machinery.
This document provides guidelines for both developers and assessors of compliant devices and systems.
NOTE 3 The resulting SIL claim of a system depends on the implementation of this document within the system – implementation of this document in a standard device is not sufficient to qualify it as a safety device.
OPC Unified Architecture - Teil 15: Sicherheit
Architecture unifiée OPC - Partie 15: Sécurité fonctionnelle
IEC 62541-15:2025 décrit une couche de communication de sécurité (services et protocole) pour l'échange de SafetyData à l'aide des mécanismes de l'IEC 62541. Il identifie les principes qui s'appliquent aux communications de sécurité fonctionnelle définies dans l'IEC 61784‑3, associés à cette couche de communication de sécurité. Cette couche de communication de sécurité est destinée à être mise en œuvre sur les appareils de sécurité uniquement.
NOTE 1 Le présent document cible la communication de contrôleur à contrôleur. Cependant, la facilité d'extension à d'autres cas d'utilisation (par exemple, communication au niveau du terrain OPC UA) a déjà été prise en compte dans la conception du présent document.
NOTE 2 Le présent document ne traite pas des aspects relatifs à la sécurité électrique et à la sécurité intrinsèque. La sécurité électrique concerne les dangers comme les chocs électriques. La sécurité intrinsèque concerne les dangers associés aux atmosphères explosibles.
Le présent document définit les mécanismes de transmission des messages relatifs à la sécurité entre les participants d'un réseau, en utilisant la technologie OPC UA conformément aux exigences de la série IEC 61508 et de l'IEC 61784-3 concernant la sécurité fonctionnelle. Ces mécanismes peuvent être utilisés dans différentes applications industrielles, par exemple la commande de processus, la fabrication, l'automatisation et les machines.
Le présent document fournit des lignes directrices aux développeurs, ainsi qu'aux évaluateurs d'appareils et de systèmes conformes.
NOTE 3 Le SIL ainsi revendiqué pour un système dépend de la mise en œuvre du présent document au sein du système (la mise en œuvre du présent document dans un appareil normal ne suffit pas à le qualifier d'appareil de sécurité).
Enotna arhitektura OPC - 15. del: Varnost
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
01-julij-2025
Enotna arhitektura OPC - 15. del: Varnost
OPC Unified Architecture - Part 15: Safety
OPC Unified Architecture - Teil 15: Sicherheit
Architecture unifiée OPC - Partie 15: Sécurité fonctionnelle
Ta slovenski standard je istoveten z: EN IEC 62541-15:2025
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.
EUROPEAN STANDARD EN IEC 62541-15
NORME EUROPÉENNE
EUROPÄISCHE NORM April 2025
ICS 25.040.40
English Version
OPC Unified Architecture - Part 15: Safety
(IEC 62541-15:2025)
Architecture unifiée OPC - Partie 15: Sécurité OPC Unified Architecture - Teil 15: Sicherheit
(IEC 62541-15:2025) (IEC 62541-15:2025)
This European Standard was approved by CENELEC on 2025-04-03. 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,
Türkiye 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
© 2025 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 62541-15:2025 E
European foreword
The text of document 65C/1334/FDIS, future edition 1 of IEC 62541-15, prepared by SC 65C
"Industrial networks" of IEC/TC 65 "Industrial-process measurement, control and automation" was
submitted to the IEC-CENELEC parallel vote and approved by CENELEC as EN IEC 62541-15:2025.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2026-04-30
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2028-04-30
document have to be withdrawn
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.
Any feedback and questions on this document should be directed to the users’ national committee. A
complete listing of these bodies can be found on the CENELEC website.
Endorsement notice
The text of the International Standard IEC 62541-15:2025 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standard indicated:
IEC 61000-6-7 NOTE Approved as EN 61000-6-7
IEC 61511 series NOTE Approved as EN 61511 series
IEC 62061 NOTE Approved as EN IEC 62061
ISO 13849 series NOTE Approved as EN ISO 13849 series
ISO 13849-1 NOTE Approved as EN ISO 13849-1
ISO 13849-2 NOTE Approved as EN ISO 13849-2
IEC 62541-7 NOTE Approved as EN IEC 62541-7
IEC 62541-8 NOTE Approved as EN IEC 62541-8
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 Where 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.cencenelec.eu.
Publication Year Title EN/HD Year
IEC 61508 series Functional safety of EN 61508 series
electrical/electronic/programmable
electronic safety-related systems - Part 1:
General requirements (see Functional
Safety and IEC 61508)
IEC 61784-3 2021 Industrial communication networks - EN IEC 61784-3 2021
Profiles - Part 3: Functional safety
fieldbuses - General rules and profile
definitions
IEC 62443 series Security for industrial automation and EN IEC 62443 series
control systems
IEC/TR 62541-1 2020 OPC Unified Architecture - Part 1: CLC IEC/TR 2021
Overview and concepts 62541-1
IEC 62541-3 2020 OPC Unified Architecture - Part 3: Address EN IEC 62541-3 2020
Space Model
IEC 62541-4 2020 OPC Unified Architecture - Part 4: Services EN IEC 62541-4 2020
IEC 62541-5 2020 OPC Unified Architecture - Part 5: EN IEC 62541-5 2020
Information Model
IEC 62541-6 2020 OPC Unified Architecture - Part 6: EN IEC 62541-6 2020
Mappings
IEC 62541-14 - OPC unified architecture - Part 14: PubSub EN IEC 62541-14 -
ISO/IEC 9834-8 2014 Information technology - Procedures for - -
the operation of object identifier registration
authorities - Part 8: Generation of
universally unique identifiers (UUIDs) and
their use in object identifiers
IEC 62541-15 ®
Edition 1.0 2025-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
OPC Unified Architecture –
Part 15: Safety
Architecture unifiée OPC –
Partie 15: Sécurité
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 25.040.40 ISBN 978-2-8327-0212-3
– 2 – IEC 62541-15:2025 © IEC 2025
CONTENTS
FOREWORD . 6
INTRODUCTION . 8
1 Scope . 9
2 Normative references. 9
3 Terms, definitions, symbols, abbreviated terms and conventions. 10
3.1 Terms and definitions . 10
3.1.1 Common terms and definitions . 10
3.1.2 Additional terms and definitions . 12
3.2 Symbols and abbreviated terms . 14
3.2.1 Abbreviated terms from IEC 61784-3 . 14
3.2.2 Additional symbols and abbreviated terms . 15
3.3 Conventions . 15
3.3.1 General conventions . 15
3.3.2 Conventions for requirements numbering . 15
3.3.3 Conventions in state machines . 16
4 Overview of OPC UA Safety . 16
4.1 General . 16
4.2 Implementation aspects . 16
4.3 Features . 17
4.4 Security policy . 17
5 General . 18
5.1 External documents providing specifications for the profile . 18
5.2 Safety functional requirements . 18
5.3 Safety measures . 18
5.4 Safety communication layer structure . 19
5.5 Requirements for CRC calculation . 21
6 Safety communication layer services . 21
6.1 General . 21
6.2 Information models . 22
6.2.1 General . 22
6.2.2 Object and ObjectType Definitions . 22
6.2.3 DataType definition . 34
6.2.4 SafetyProvider version . 38
6.2.5 DataTypes and length of SafetyData . 38
6.2.6 Connection establishment . 38
6.3 Service interfaces . 38
6.3.1 Overview . 38
6.3.2 OPC UA Platform interface (OPC UA PI) . 39
6.3.3 SafetyProvider interfaces . 39
6.3.4 SafetyConsumer interfaces . 46
6.3.5 Cyclic and acyclic safety communication . 53
6.3.6 Principle for "application variables with qualifier" . 53
6.4 Diagnostics . 53
6.4.1 General . 53
6.4.2 Diagnostics messages of the SafetyConsumer . 54
6.4.3 Method ReadSafetyDiagnostics of the SafetyProvider . 56
IEC 62541-15:2025 © IEC 2025 – 3 –
7 Safety communication layer protocol . 56
7.1 General . 56
7.2 SafetyProvider and SafetyConsumer . 56
7.2.1 SPDU formats . 56
7.2.2 Behaviour . 58
7.2.3 Subroutines . 76
8 Safety communication layer management . 82
8.1 General . 82
8.2 Safety function response time part of communication . 82
9 System requirements (SafetyProvider and SafetyConsumer) . 84
9.1 Constraints on the SPDU parameters . 84
9.1.1 SafetyBaseID and SafetyProviderID . 84
9.1.2 SafetyConsumerID . 85
9.2 Initialization of the MNR in the SafetyConsumer . 86
9.3 Constraints on the calculation of system characteristics . 86
9.3.1 Probabilistic considerations (informative) . 86
9.3.2 Safety related assumptions (informative) . 88
9.4 PFH and PFD values of
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