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Description of BS EN IEC 62541-4:2020 2020IEC 62541-4:2020 is available as IEC 62541-4:2020 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.IEC 62541-4:2020 defines the OPC Unified Architecture (OPC UA)
Services. The Services defined are the collection of abstract
Remote Procedure Calls (RPC) that are implemented by OPC UA Servers
and called by OPC UA Clients. All interactions between OPC UA
Clients and Servers occur via these Services. The defined Services
are considered abstract because no particular RPC mechanism for
implementation is defined in this document. IEC 62541-6 specifies
one or more concrete mappings supported for implementation. For
example, one mapping in IEC 62541-6 is to XML Web Services. In that
case the Services described in this document appear as the Web
service methods in the WSDL contract. Not all OPC UA Servers will
need to implement all of the defined Services. IEC 62541-7 defines
the Profiles that dictate which Services need to be implemented in
order to be compliant with a particular Profile 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 ability to resend all data of monitored
items in a Subscription using the ResendData Method. b) Added
support for durable Subscriptions (lifetime of hours or days). c)
Added Register2 and FindServersOnNetwork Services to support
network-wide discovery using capability filters. d) Removed
definition of software certificates. Will be defined in a future
edition. e) Extended and partially revised the redundancy
definition. Added sub-range definitions for ServiceLevel and added
more terms for redundancy. f) Added a section on how to use
Authorization Services to request user access tokens. g) Added JSON
Web Tokens (JWTs) as a new user token. h) Added the concept of
session-less service invocation. i) Added a generic structure that
allows passing any number of attributes to the AddNodes Service. j)
Added requirement to protect against user identity token attacks.
k) Added new EncryptedSecret format for user identity tokens.
About BSIBSI Group, also known as the British Standards Institution is the national standards body of the United Kingdom. BSI produces technical standards on a wide range of products and services and also supplies certification and standards-related services to businesses. |
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