Design Of Web Based Ladder Logic Tool Kit For Programmable Logic Controller Education

Abstract

Labs are often an essential component in engineering education. However, factors such as limited lab time, expensive equipment and high student-to-equipment ratios often hinder students' learning. Simulation tools can be used to help prepare students to take full advantage of limited lab resources. This paper describes a web-based Ladder Logic Toolkit that provides physical and procedural simulation experiences that can help students learn about programmable logic controllers (PLCs). Students first select a programming template. Then they drag programming instructions from a tool box to the template. Finally, they evaluate program accuracy by manipulating animated input devices and observing the animated output devices. The Toolkit was evaluated by 30 undergraduate students enrolled in a manufacturing automation and robotics course. Students completed a pre-test before using the Toolkit and a post-test afterwards. Differences between students' pre-and post-test scores were significant ( = .05). In addition, students responded positively to a survey that asked their opinions about the Toolkit's effectiveness, ease-of-use, and relevance to their education. The Toolkit has been incorporated into Virtual PLC, a web-based system for PLC education. Future enhancements may include the development of additional explanatory feedback for certain ladder logic arrangements and extending the programming language from ladder logic to functional block diagram.