Rancang Bangun Sistem Pengontrolan Alat Kelistrikan Dan Elektronika Menggunakan Outseal PLC Dan Smartphone Melalui Komunikasi Modbus HMI

The development of industrial automation technology allows electrical equipment control systems to be carried out wirelessly. This study designs an electrical and electronic equipment control system using Outseal PLC controlled via smartphone with Modbus HMI communication. The HC-05 Bluetooth module is used as a communication medium, and a 4-channel relay module as an actuator. Push buttons are used as manual input. The design includes hardware design, ladder diagram programming, and system testing. The test results show that the system is able to control electrical equipment effectively via smartphone with an optimal communication distance of ±9–10 meters. The relay responds to ON/OFF commands from the HMI application well, although there is a delay when the distance is more than 10 meters. The relay output voltage ranges from 208–220 V AC when ON, and approaches 0 V when OFF. The system can also be controlled manually via push buttons. Based on the test, this system is feasible to be implemented as a small-scale electrical equipment control solution.