Automated Library Shelf Management System with Programmable Logic Controller and Human-machine Interface

This paper explores the shelf movement in a library system, driven by an Allen-Bradley PLC and an HMI interface. This project was part of the advanced PLC course at Michigan Technological University and involved building a prototype of library shelves using 3D printing technology. The system is controlled by a PLC, which manages NEMA stepper motors and motor drivers to facilitate shelf movement. Limit switches are employed to ensure the safe positioning of the shelves, preventing them from crashing into the walls, while a photoelectric sensor provides additional safety by ensuring the shelves do not move towards a person. This project demonstrates the integration of advanced control systems and mechanical design to automate library shelf operations efficiently.