IEC 62541-6:2025
OPC unified architecture - Part 6: Mappings
OPC unified architecture - Part 6: Mappings
- Статус документа:
- Действующий
- Формат:
- Электронный (PDF)
- Количество страниц:
- 138
- Дата публикации:
- 23 декабря 2025 г.
- Издание:
- IEC IS 62541 edition 4 version 1
- ICS:
- 25.040.40
IEC 62541-6:2025 specifies the mapping between the security model described in IEC 62541‑2, the abstract service definitions specified in IEC 62541‑4, the data structures defined in IEC 62541‑5 and the physical network protocols that can be used to implement the OPC UA specification. This fourth edition cancels and replaces the third 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 support for ECC to UA Secure Conversation; b) use of the AuthorityKeyIdentifier extension in Certificate Revocation Lists; c) enhancement of JSON mapping of Unions; d) addition of Decimal data type encoding. e) description of ECC keyUsage rules; f) addition of Media assigned by IANA to UANodeSet definition; g) addition of requirements for user and issuer Certificates; h) addition of rules which specify what happens when DateTime precision is lost; i) addition of rules to allow for the truncation of strings containing embedded nulls. J) definition of a normative string representation for NodeId, ExpandedNodeId and QualifiedName for JSON mapping. k) requirement that TAI times be converted to UTC; l) new possibility to omit Symbol if unknown in JSON encoding; m) addition of fields needed to support RolePermissions to the UANodeSet
Abstract
Overview
IEC 62541-6:2025 - "OPC unified architecture - Part 6: Mappings" defines how the OPC UA abstract services, data structures and security model are mapped to concrete network protocols and encodings. This fourth edition (2025) is a technical revision of the 2020 edition and specifies the OPC UA Binary, XML and JSON encodings, transport protocol mappings (OPC UA TCP, HTTPS, WebSockets, SOAP/HTTP) and message/security protocol behaviours required for interoperable implementations.
Key topics and technical requirements
- Mappings between layers: normative mapping of the security model (IEC 62541‑2), abstract services (IEC 62541‑4) and data structures (IEC 62541‑5) to transport protocols and encodings.
- Encodings supported: OPC UA Binary, OPC UA XML, OPC UA JSON - including rules for built-in types, structures, unions, Variant and ExtensionObject.
- Security & certificates:
- UA Secure Conversation enhancements, including ECC (Elliptic Curve Cryptography) support.
- Requirements for Application Instance Certificates, User and Issuer (CA) certificates, certificate chains and CRL (Certificate Revocation Lists) (including use of AuthorityKeyIdentifier).
- ECC-specific keyUsage rules and ECC encryption for user tokens.
- Data type and mapping updates:
- Decimal data type encoding added.
- Enhanced JSON mapping of Unions and a normative string representation for NodeId, ExpandedNodeId and QualifiedName.
- Rules for DateTime precision loss (TAI converted to UTC) and for truncating strings with embedded nulls.
- Option to omit Symbol in JSON when unknown.
- Protocol specifics: OPC UA Connection Protocol, MessageChunk handling, WebSocket mapping, HTTPS mappings (session-less services, XML/Binary/JSON support) and well-known addresses.
- Normative artifacts: OPC Binary Schema, XML Schema, WSDL, UANodeSet and Information Model XML Schema (including Media types registered with IANA and RolePermissions support).
Practical applications
- Implementing interoperable OPC UA stacks for industrial automation, IIoT, SCADA and building management systems.
- Guiding secure integration of OPC UA in edge gateways, PLCs, HMIs, historians and cloud connectors.
- Defining encoding and certificate handling for vendors delivering compliant clients, servers and security modules.
Who should use this standard
- OPC UA stack developers and protocol engineers
- System integrators and automation vendors
- Security architects implementing secure OPC UA channels and certificate management
- Test labs and certification bodies validating OPC UA interoperability
Related standards
- IEC 62541‑2 (Security model)
- IEC 62541‑4 (Abstract services)
- IEC 62541‑5 (Data structures)
- Other IEC 62541 parts for information models and profiles
Keywords: IEC 62541-6:2025, OPC UA mappings, OPC Unified Architecture, OPC UA Binary, OPC UA JSON, ECC, Decimal data type, NodeId, UANodeSet, secure conversation, certificates, WebSockets, HTTPS.
Технические детали
- Технический комитет
- SC 65E - Devices and integration in enterprise systems
- SKU
- IEC 62541-6:2025
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