Web-pohjainen valvomojärjelmä teolliseen internetiin

摘要

In the shift towards an Industrial Internet, programmable logic controllers, used to drive processes in industrial facilities, are more intelligent and capable of mutual communication and independent decision-making. Essentially, these controllers are also directly connected to the Internet, which opens new possibilities for the implementation of process control and monitoring systems.The goal of this thesis is to assess the suitability of web technologies for the development of supervisory control and data acquisition systems. The assessment is performed by developing a web-based monitoring system and comparing it to other solutions currently in the market. The available features and usability are used as the criterion for the comparison. The OPC UA standard for industrial information modeling and data transfer is used as the Industrial Internet platform when developing the application.The practical part of the thesis is concerned with the development of a generic OPC UA web client. The web client serves as a framework for the development of web-based supervisory control systems that take advantage of the standard data modeling features of OPC UA. Modern web technologies enable the implementation of periodic updates and reusable user interface components, and a uniform service interface transfers the application state with service requests. A central theme in the thesis is the integration of software components written in the Java and JavaScript programming languages.The implementation shows that web techniques can be used to implement both request/response based and event-based information transfer between logic controllers and end-user devices. The standardization of reusable web components makes the development of web-based industrial monitoring systems more attractive by allowing to combine functionality and style definitions into uniform building blocks. Finally, incompatibility issues between OPC UA sessions and the RESTful architecture were identified and assigned as subjects of future work.