BS EN IEC 62541-4:2020 - OPC Unified Architecture. Services

BS EN IEC 62541-4:2020

OPC Unified Architecture. Services

Status : Current   Published : September 2020



IEC 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.

Standard NumberBS EN IEC 62541-4:2020
TitleOPC Unified Architecture. Services
Publication Date25 September 2020
Normative References(Required to achieve compliance to this standard)IEC TR 62541-2, IEC TR 62541-1, EN IEC 62541-3, CLC/TR 62541-2, IEC 62541-3, EN IEC 62541-6, IEC 62541-12, CLC/TR 62541-1, EN IEC 62541-11, IEC 62541-13, EN IEC 62541-5, EN IEC 62541-8, EN IEC 62541-7, EN IEC 62541-13, IEC 62541-11, EN IEC 62541-12, IEC 62541-6, IEC 62541-7, IEC 62541-5, IEC 62541-8
Informative References(Provided for Information)No other standards are informatively referenced
ReplacesBS EN 62541-4:2015
International RelationshipsEN IEC 62541-4:2020,IEC 62541-4:2020
Draft Superseded By18/30365345 DC
DescriptorsData acquisition, Information exchange, Interfaces (data processing), Software engineering techniques, Digital computers, Information services, Computer software, Computer networks, Data transmission, Objects (programming language), Unified modelling language, Control technology, Computer technology, Data processing, Data management, Data representation, Technology transfer
Title in FrenchArchitecture Unifiée OPC Services
Title in GermanOPC Unified Architecture Dienste
ISBN978 0 580 51133 2
File Size5.745 MB

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