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Standard

NEK IEC 62541-12:2025

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Abstract

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.

Document information

  • Standard from NEK
  • Published:
  • Edition: 2.0
  • Version: 1
  • Document type: NAT
  • ICS 25.040.40

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