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IEC 62541-4-ed.3.0
OPC Unified Architecture - Part 4: Services
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STANDARD published on 13.7.2020
The information about the standard:
Designation standards: IEC 62541-4-ed.3.0
Publication date standards: 13.7.2020
SKU: NS-998071
The number of pages: 475
Approximate weight : 1456 g (3.21 lbs)
Country: International technical standard
Category: Technical standards IEC
The category - similar standards:
Industrial process measurement and controlMultilayer applications
Annotation of standard text IEC 62541-4-ed.3.0 :
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. IEC 62541-4:2020 est disponible sous forme de IEC 62541-4:2020 RLV qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis ledition precedente. LIEC 62541-4:2020 definit le modele de communication Services de larchitecture unifiee OPC (OPC UA). Les Services definis sont le recueil dappels de procedures abstraites distantes (RPC, Remote Procedure Call) qui sont mises en ouvre par les Serveurs OPC UA et qui sont appelees par les Clients OPC UA. Toutes les interactions entre Clients et Serveurs OPC UA ont lieu via ces Services. Les Services definis sont dits abstraits, car aucun mecanisme RPC particulier nest specifie dans le present document pour leur mise en ouvre. LIEC 62541-6 specifie un ou plusieurs mecanismes concrets de mapping pour la mise en ouvre. Par exemple, dans lIEC 62541-6, lun des mecanismes de mapping repose sur lutilisation des Services Web XML. Dans ce cas, les Services decrits dans le present document apparaissent comme les methodes de services Web dans le contrat WSDL. Il nest pas necessaire que lensemble des Serveurs OPC UA mettent en ouvre toutes les correspondances avec les messages et les protocoles de transport. LIEC 62541-7 definit les Profils qui dictent les Services quil est necessaire de mettre en ouvre afin detre conforme a un Profil particulier. Cette troisieme edition annule et remplace la deuxieme edition parue en 2015. Cette edition constitue une revision technique. Cette edition inclut les modifications techniques majeures suivantes par rapport a ledition precedente: a) ajout de la capacite a renvoyer toutes les donnees des elements surveilles dans un abonnement a laide de la methode ResendData; b) ajout de la prise en charge pour les abonnements durables (duree de vie en heures ou en jours); c) ajout des services Register2 et FindServersOnNetwork pour prendre en charge le mecanisme de decouverte sur lensemble du reseau a laide de filtres de capacites; d) suppression de la definition des certificats de logiciel (seront definis dans une edition ulterieure); e) enrichissement et revision partielle de la definition de la redondance; ajout de definitions des sous plages pour ServiceLevel et ajout de termes supplementaires pour la redondance; f) ajout dun paragraphe expliquant comment utiliser les Services dautorisation pour demander des jetons dacces utilisateur; g) ajout des jetons JSON Web (JWT) comme nouveau jeton dutilisateur; h) ajout du concept dinvocation de service sans session; i) ajout dune structure generique permettant de transmettre nimporte quel nombre dattributs dans le service AddNotes; j) ajout dune exigence relative a la protection contre les attaques de jeton didentite utilisateur; k) ajout du nouveau format EncryptedSecret pour les jetons didentite utilisateur.
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