Web-based control of programmable logic controllers in process control computers education

摘要

Industrial control computers can be connected to the Internet, and equipped with a Web interface. This enables access to process data from any computer with a set of common web-related software applications. This paper deals with laboratory exercises performed as a part of courses regarding process control computers, which include tasks dealing with this topic. Integration of Java and HTML technologies is described, and an example of a simple process and its Web interface is given. PLC computers equipped with an advanced communication modules are connected to a personal computer (PC) via Ethernet. Alongside implementation of Java applets in Web environment, human machine interface design is regarded.