OPC-UA的替代品 [英] Alternative to OPC-UA

问题描述

作为访问由各种PLC组成的系统的过程数据的解决方案，OPC-UA是否有任何不错的选择?平台无关的东西，可以与不同品牌的产品对话"吗?

Is there any decent alternative to OPC-UA as a solution for accessing process data of a system composed of various PLCs? Something that is platform independent and can "speak" with products of different brands ?

我听说过 MQTT ，但这似乎更像是一种传输协议，仅此而已.它没有像信息建模之类的所有更高层次的东西.

I've heard of MQTT but it seems to be much more like a transport protocol, and only that. It does not have all the higher level stuff like the information modeling, etc.

感谢您的帮助！

推荐答案

OPC是与PLC通信的唯一标准方法. OPC DA是旧的替代方法.如今，OPC UA是新的并推荐使用.在OPC之前，只有专有协议和共享协议(如Modbus)，但是正如您所提到的，它们只是较低级别的传输协议.

OPC is the only standard way for communicating with PLCs. OPC DA is the old alternative. OPC UA is the new one and recommended, nowadays. Before OPC there was just proprietary protocols and shared protocols like Modbus, but they are just lower level transport protocols as you've mentioned.

OPC UA在信息建模方面非常独特.通过该功能，除了普通的PLC通信之外，它还为更高级别的系统和应用程序提供了新的通信可能性.

OPC UA is pretty unique with the Information Modeling, especially. With that feature it is enabling new communication possibilities for higher level systems and applications as well, in addition to plain PLC communication.

请注意，某些PLC也可以本地通信OPC UA，这使它成为一种标准.

Note that some PLCs can also talk OPC UA natively, which makes it a standard in that way.

OPC UA确实被标准化为IEC 62541，以确保其独立性.

And OPC UA is really standardised as IEC 62541, ensuring that it's independent.

更新19/07/19:OPC UA现在也定义为我在最近的文章中写到的工业4.0通讯" .

Update 17/07/19: OPC UA is now defined also as the Industry 4.0 Communication as I wrote in my recent article.

05年5月20日更新:OPC UA 1.04版定义了发布/订阅替代方案，使用UDP用于本地网络中的安全数据多播，使用AMQP/MQTT用于基于安全代理的数据&事件传送到云系统. 1.04版还定义了WebSocket/JSON协议替代方案，使Web应用程序更容易使用.这些都不是广泛可用的，但是希望将在2020-21年期间流行.

Update 20/05/05: OPC UA version 1.04 defines Pub/Sub alternatives, using UDP for secure data multicast in local networks and AMQP/MQTT for secure broker based data & event delivery to cloud systems. Version 1.04 also defines a WebSocket/JSON protocol alternative, which enable easier usage in web applications. None of these are broadly available, yet, but hopefully will become popular in 2020-21 time frame.

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