<![CDATA[Problems in control systems such as difficult access or long distances to give commands can be overcome by using Supervisory Control and Data Acquisition (SCADA). SCADA systems enable real-time monitoring and control of industrial processes, allowing operators to make informed decisions from remote locations. By integrating various data sources, SCADA improves operational efficiency and increases response time to potential problems. SCADA systems allow users to monitor production processes directly without having to be on site. It also increases data transparency, so that any failures can be monitored and identified by engineers or by analysis. This technology also poses, the challenge of high implementation costs, the need for skilled personnel to manage and maintain the system. Therefore, it is very important for the industry to consider the advantages for the adoption of SCADA technology. Therefore, this research aims to build a SCADA system that can be accessed by small and medium industries. This system uses a Programmable Logic Controller (PLC) as the controller and Human Machine Interface (HMI) as the interface on the Remote Terminal Unit (RTU). RTU sends data to the Master Terminal Unit (MTU) which is developed independently to be monitored and controlled remotely using Industrial IoT technology with Message Queueing Telemetry Transport (MQTT) protocol. The variables used in this system are temperature in RTU 1 and rotational speed in RTU 2, with the aim of measuring communication duration and data accuracy. The results showed that sensor accuracy reached 98.6% on RTU 1 and 100% on RTU 2. Communication accuracy between layers reached 100%, with real-time communication duration between layers of 0.324 seconds, making it very efficient in terms of cost. From the test results, the SCADA system based on IoT technology is reliable to be applied in small to medium industrial environments, easily replicated, and reconfigured.]]>
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