EN IEC 62541-12:2020

OPC unified architecture - Part 12: Discovery and global services

IEC 62541-12:2020 specifies how OPC Unified Architecture (OPC UA) Clients and Servers interact with DiscoveryServers when used in different scenarios. It specifies the requirements for the LocalDiscoveryServer, LocalDiscoveryServer-ME and GlobalDiscoveryServer. It also defines information models for Certificate management, KeyCredential management and Authorization Services.

OPC Unified Architecture - Teil 12: Erkundung und globale Dienste

Architecture unifiée OPC - Partie 12: Services globaux et de découverte

IEC 62541-12:2020 spécifie la manière dont les Clients et les Serveurs de l'Architecture Unifiée OPC (OPC UA) interagissent avec les DiscoveryServers lorsqu'ils sont utilisés dans différents scénarios. Elle définit les exigences pour le LocalDiscoveryServer, le LocalDiscoveryServer-ME et le GlobalDiscoveryServer. Elle définit également les modèles d'information pour la gestion des Certificats, la gestion des KeyCredentials et les Services d'Autorisation.

Enotna arhitektura OPC - 12. del: Razkritje in globalne storitve (IEC 62541-12:2020)

General Information

• Status: Published
• Publication Date: 06-Aug-2020
• ICS: 25.040.40 - Industrial process measurement and control
• Technical Committee: CLC/TC 65X - Industrial-process measurement, control and automation
• Drafting Committee: IEC/SC 65E - IEC_SC_65E
• Current Stage: 6060 - Document made available - Publishing
• Start Date: 07-Aug-2020
• Completion Date: 07-Aug-2020
• Ref Project: SIST EN IEC 62541-12:2020 - OPC Unified Architecture Specification - Part 12: Discovery (IEC 62541-12:2020)

Relations

• Revised: prEN IEC 62541-12:2024 - OPC unified architecture - Part 12: Discovery and global services
• Effective Date: 31-Jan-2023

Standards Content (Sample)

SLOVENSKI STANDARD
01-december-2020
Enotna arhitektura OPC - 12. del: Razkritje in globalne storitve (IEC 62541-12:2020)
OPC Unified Architecture Specification - Part 12: Discovery (IEC 62541-12:2020)
OPC Unified Architecture - Teil 12: Erkundung und globale Dienste (IEC 62541-12:2020)
Architecture unifiée OPC - Partie 12: Services globaux et de découverte (IEC 62541-
12:2020)
Ta slovenski standard je istoveten z: EN IEC 62541-12:2020
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 62541-12

NORME EUROPÉENNE
EUROPÄISCHE NORM
August 2020
ICS 25.040.40
English Version
OPC unified architecture - Part 12: Discovery and global
services
(IEC 62541-12:2020)
Architecture unifiée OPC - Partie 12: Services globaux et de OPC Unified Architecture - Teil 12: Erkundung und globale
découverte Dienste
(IEC 62541-12:2020) (IEC 62541-12:2020)
This European Standard was approved by CENELEC on 2020-07-21. 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
© 2020 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 62541-12:2020 E

European foreword
The text of document 65E/711/FDIS, future edition 1 of IEC 62541-12, prepared by SC 65E "Devices
and integration in enterprise systems" of IEC/TC 65 "Industrial-process measurement, control and
automation" was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2021-04-21
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2023-07-21
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.

Endorsement notice
The text of the International Standard IEC 62541-12:2020 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  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.cenelec.eu.
Publication Year Title EN/HD Year
IEC/TR 62541-1 - OPC unified architecture - Part 1: Overview CLC/TR 62541-1 -
and concepts
IEC/TR 62541-2 - OPC unified architecture - Part 2: Security CLC/TR 62541-2 -
model
IEC 62541-3 - OPC Unified Architecture - Part 3: Address - -
Space Model
IEC 62541-4 - OPC Unified Architecture - Part 4: Services - -
IEC 62541-5 - OPC Unified Architecture - Part 5: - -
Information Model
IEC 62541-6 - OPC Unified Architecture - Part 6: Mappings - -
IEC 62541-7 - OPC unified architecture - Part 7: Profiles - -
IEC 62541-9 - OPC Unified Architecture - Part 9: Alarms - -
and Conditions
IEC 62541-14 - OPC Unified Architecture - Part 14: PubSub - -
X.500: ISO/IEC 2017 Information technology - Open Systems
9594-1 Interconnection - The Directory - Part 1:
Overview of concepts, models and services
IETF RFC 1035 - Domain Names - Implementation and - -
Specification
IETF RFC 2986 - PKCS #10: Certification Request Syntax - -
Specification Version 1.7
IETF RFC 3927 - Dynamic Configuration of IPv4 Link-Local - -
Addresses
IETF RFC 5958 - Asymmetric Key Packages - -
IETF RFC 6762 - mDNS: Multicast DNS - -
IETF RFC 6763 - DNS-SD: DNS Based Service Discovery - -
IETF RFC 7030 - Enrollment over Secure Transport - -
PKCS #12 - Personal Information Exchange Syntax - -
DI - OPC Unified Architecture for Devices (DI) - -
ADI - OPC Unified Architecture for Analyzer - -
Devices (ADI)
PLCopen - OPC Unified Architecture / PLCopen - -
Information Model
FDI - OPC Unified Architecture for FDI - -
ISA-95 - ISA-95 Common Object Model - -

IEC 62541-12 ®
Edition 1.0 2020-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
OPC unified architecture –
Part 12: Discovery and global services

Architecture unifiée OPC –
Partie 12: Services globaux et de découverte

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 25.040.40 ISBN 978-2-8322-8455-1

– 2 – IEC 62541-12:2020 © IEC 2020
CONTENTS
FOREWORD . 8
1 Scope . 10
2 Normative references . 10
3 Terms, definitions, abbreviated terms and conventions . 11
3.1 Terms and definitions . 11
3.2 Abbreviated terms and symbols . 13
3.3 Conventions for namespaces . 13
4 The discovery process . 14
4.1 Overview. 14
4.2 Registration and announcement of Applications . 15
4.2.1 Overview . 15
4.2.2 Hosts with a LocalDiscoveryServer . 15
4.2.3 Hosts without a LocalDiscoveryServer . 16
4.3 The discovery process for Clients to find Servers . 16
4.3.1 Overview . 16
4.3.2 Security . 17
4.3.3 Simple Discovery with a DiscoveryUrl . 17
4.3.4 Local Discovery . 17
4.3.5 MulticastSubnet Discovery . 18
4.3.6 Global Discovery . 19
4.3.7 Combined Discovery Process for Clients . 19
5 Local Discovery Server . 20
5.1 Overview. 20
5.2 Security considerations for Multicast DNS . 21
6 Global Discovery Server . 21
6.1 Overview. 21
6.2 Network architectures . 22
6.2.1 Overview . 22
6.2.2 Single MulticastSubnet . 22
6.2.3 Multiple MulticastSubnet . 23
6.2.4 No MulticastSubnet. 23
6.2.5 Domain Names and MulticastSubnets . 24
6.3 Information Model . 25
6.3.1 Overview . 25
6.3.2 Directory . 25
6.3.3 DirectoryType . 25
6.3.4 FindApplications . 26
6.3.5 ApplicationRecordDataType. 27
6.3.6 RegisterApplication . 28
6.3.7 UpdateApplication . 29
6.3.8 UnregisterApplication . 30
6.3.9 GetApplication . 30
6.3.10 QueryApplications . 31
6.3.11 QueryServers (deprecated) . 33
6.3.12 ApplicationRegistrationChangedAuditEventType . 34
7 Certificate management overview . 35

IEC 62541-12:2020 © IEC 2020 – 3 –
7.1 Overview. 35
7.2 Pull Management . 36
7.3 Push management . 36
7.4 Provisioning . 37
7.5 Common Information Model . 38
7.5.1 Overview . 38
7.5.2 TrustListType . 38
7.5.3 OpenWithMasks . 39
7.5.4 CloseAndUpdate . 40
7.5.5 AddCertificate . 41
7.5.6 RemoveCertificate . 42
7.5.7 TrustListDataType . 42
7.5.8 TrustListMasks . 43
7.5.9 TrustListOutOfDateAlarmType . 43
7.5.10 CertificateGroupType . 43
...