This study presents the development of a fractional-order proportional integral (FOPI) controller and the modelling of a DC servo-system designed for the industrial applications. The servo-motor and the modular servo-system (MS150-MK3) have been simulated and the FOPI controller has been verified for this system. The examination of several elements of the modular servo-system is demonstrated. In addition, the performance of the proposed controller for the modelled system is evaluated by considering several transient response characteristics, including overshoot, steady-state error, and delay time. The stability of the suggested controller has been evaluated by testing it with various gain values. Finally, numerous PI controllers have also been evaluated and tested experimentally, demonstrating significantly improved results.