Resumen:
IEC 62541-8:2020 is available as
IEC
62541-8:2020 RLV which contains the International Standard and
its Redline version, showing all changes of the technical content
compared to the previous edition.
IEC 62541-8:2020 is part of the overall OPC Unified
Architecture (OPC UA) standard series and 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. This third edition cancels and
replaces the second edition published in 2015. This edition
constitutes a technical revision. This edition includes the
following significant technical changes with respect to the
previous edition: a) added new VariableTypes for AnalogItems; b)
added an Annex that specifies a recommended mapping of OPC UA
Dataccess to OPC COM DataAccess; c) changed the ambiguous
description of "Bad_NotConnected"; d) updated description for
EUInformation to refer to latest revision of UNCEFACT units.
Keywords:
Data transmission, Control technology, Data processing, Objects (programming language), Digital computers, Information exchange, Unified modelling language, Interfaces (data processing), Computer software, Technology transfer, Computer technology, Access control (data)