IEC 62541-4:2020 OPC统一架构 - 第4部分:服务

标准编号：IEC 62541-4:2020

中文名称：OPC统一架构 - 第4部分:服务

英文名称：OPC Unified Architecture - Part 4: Services

发布日期：2020-07-13

标准范围

IEC 62541-4:20 20作为IEC 62541-4:20 20 RLV提供，其中包含国际标准及其红线版本，显示了与上一版本相比技术内容的所有变化。IEC 62541-4:20 20定义了OPC统一架构（OPC UA）服务。定义的服务是由OPC UA服务器实现并由OPC UA客户端调用的抽象远程过程调用（RPC）的集合。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用于实现的特定RPC机制。IEC 62541-6规定了支持实现的一个或多个具体映射。例如，IEC 62541-6中的一个映射是到XML Web服务。在这种情况下，本文档中描述的服务在WSDL契约中显示为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定义了配置文件，这些配置文件规定了需要实施哪些服务才能符合特定的配置文件。第三版取消并取代了2015年发布的第二版。本版构成技术修订版。与上一版相比，此版本包括以下重大技术变更:a)增加了使用ResendData方法重新发送订阅中受监控项目的所有数据的能力。b)增加了对持久订阅的支持（生命周期为小时或天）。c)添加了Register2和FindServersOnNetwork服务，以支持使用功能过滤器进行网络范围的发现。d)删除了软件证书的定义。将在未来的版本中定义。e)扩展并部分修订了冗余定义。添加了ServiceLevel的子范围定义，并添加了更多冗余术语。f)增加了如何使用授权服务请求用户访问令牌的部分。g)添加了JSON Web令牌(JWT)作为新的用户令牌。h)增加了无会话服务调用的概念。i)添加了一个通用结构，允许向AddNodes服务传递任意数量的属性。j)增加了防止用户身份令牌攻击的要求。k)为用户身份令牌添加了新的EncryptedSecret格式。

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 OPC统一架构 - 第4部分:服务

标准范围

标准预览图