Simon Milavec (2012) Supervisory control system implemented in programmable logical controller web server. EngD thesis.
In this thesis, we study the feasibility of supervisory control and data acquisition (SCADA) system realisation in a web server of a programmable logic controller. With the introduction of Ethernet protocol to the area of process control, the more powerful programmable logic controllers obtained integrated web servers. The web server of a programmable logic controller, produced by Siemens, will also be described in this thesis. Firstly, the software and the hardware equipment used for realisation of the web-based SCADA system is listed and described. It is followed by a description of a web server and its functionalities. Furthermore, the creation of user defined web pages, with which a SCADA system can be created, is explained in detail. Additional explanation is provided concerning the capabilities a good SCADA system has to offer and what are the possibilities of their realisation using user defined web pages. Moreover, a realised SCADA system with WebScada library is described. The WebScada library, developed as a part of the thesis, contains graphic elements for formation of a SCADA system.
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