IEC 62541-8:2025
Current
The latest, up-to-date edition.
OPC unified architecture - Part 8: Data access
Hardcopy , PDF
English, French, English - French
23-12-2025
IEC 62541-8:2025 defines the information model associated with Data Access (DA). It particularly includes additional VariableTypes and complementary descriptions of the NodeClasses and Attributes needed for Data Access, additional Properties, and other information and behaviour.
The complete address space model, including all NodeClasses and Attributes is specified in IEC 62541‑3. The services to detect and access data are specified in IEC 62541‑4.
Annex A specifies how the information received from OPC COM Data Access (DA) Servers is mapped to the Data Access model.
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 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.
- rules have been added when ValuePrecision has negative values.
| Committee |
TC 65/SC 65E
|
| DocumentType |
Standard
|
| Pages |
92
|
| PublisherName |
International Electrotechnical Committee
|
| Status |
Current
|
| Supersedes |
Access your standards online with a subscription
-
Simple online access to standards, technical information and regulations.
-
Critical updates of standards and customisable alerts and notifications.
-
Multi-user online standards collection: secure, flexible and cost effective.
Important note : Users cannot be edited or removed once added to your Multi user PDF.