标准摘要
[中文适用范围]： 本部分IEC 62541定义了OPC统一架构(OPC UA)服务。所描述的服务是由OPC UA服务器实现并由OPC UA客户端调用的一组抽象远程过程调用(RPC)。OPC UA客户端和服务器之间的所有交互都通过这些服务进行。定义的服务被认为是抽象的，因为本文档中没有定义特定的RPC实现机制。IEC 62541-6规定了一个或多个支持实现的具体映射。例如，IEC 62541-6中的一个映射是XML Web服务。在这种情况下，本文档中描述的服务显示为WSDL合同中的Web服务方法。 并非所有OPC UA服务器都需要实现所有定义的服务。IEC 62541-7定义了规定需要实现哪些服务以符合特定配置文件的配置文件。 [外文原描述]： IEC 62541-4:2020 RLV contains both the official IEC International Standard and its Redline version. The Redline version is available in English only and provides you with a quick and easy way to compare all the changes between the official IEC Standard and its 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.
英文名称OPC Unified Architecture - Part 4: Services