IEC 62541-12:2025
Current
The latest, up-to-date edition.
OPC unified architecture - Part 12: Discovery and global services
Hardcopy , PDF
English, French, English - French
22-12-2025
IEC 62541-12:2025 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 AuthorizationServices.
Annex A informatively discusses deployment and configuration aspects.
Annex B defines NodeSet and numeric NodeIds.
Annex F provides installation rules for the LDS.
Annex H compares the Certificate management defined in this document with IETF RFC 7030.
This second edition cancels and replaces the first edition published in 2020. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
a) addition of a "Quantity Model" which can be referenced from EngineeringUnit Properties. The model defines quantities and assigned units. In addition it provides alternative units and the conversion to them;
b) addition of rules for ValuePrecision Property:
• can also be used for other subtypes like Duration and Decimal.
• additional rules when ValuePrecision has negative values.
| DocumentType |
Standard
|
| Pages |
142
|
| PublisherName |
International Electrotechnical Committee
|
| Status |
Current
|
| Supersedes |
| Standards | Relationship |
| UNE-EN IEC 62541-12:2026 | Identical |
| CEI EN IEC 62541-12:2026-04 | Identical |
| BS EN IEC 62541-12:2026 | Identical |
| ANSI/ISA-95.00.06:2014 | ENTERPRISE-CONTROL SYSTEM INTEGRATION - PART 6: MESSAGING SERVICE MODEL |
| CEI EN IEC 62541-1:2026 | OPC unified architecture – Part 1: Overview and concepts |
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