This paper describes an educational tool development of a magnetic levitation system using a PLC. In order to learn the feedback control theory easily, we propose the method to design the feedback controller by a physical knowledge. The magnetic levitation system is constructed by mechanical and electrical systems. The feedback control gains can be decided by specifying the damping rate and the natural frequency for the mechanical system and the time constant for the electrical system. The feedback controller model designed by MATLAB(R)/Simulink(R) is converted into PLC program by PLC coder of MATLAB toolbox. The controller program is implemented into PLC controller by Sysmac(R) Studio software of PLC development environment. We confirmed that it is possible to implement the feedback control of the magnetic levitation by using PLC controller from the experimental results.

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