IEC 62541-6 Ed. 4.0 b:2025

Current Revision
OPC unified architecture - Part 6: Mappings

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OPC unified architecture - Part 6: Mappings

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 s;
  • 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.
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