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PLC vs RTU: What Is the Difference and Which One Should You Use?

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Industrial automation systems often need to collect data, monitor equipment, execute control logic, and communicate with operators or central control rooms. Two devices commonly used for these tasks are the Programmable Logic Controller (PLC) and the Remote Terminal Unit (RTU) . Although PLCs and RTUs can perform some similar functions, they are not designed for exactly the same operating environment. Choosing the wrong device can lead to unnecessary costs, communication limitations, difficult maintenance, or an automation architecture that does not fit the actual process. The question is not simply PLC vs RTU: which one is better? The more important question is: Which device is better suited to your application? This article explains the key differences between PLC and RTU systems, including their architecture, communication capabilities, processing requirements, environmental suitability, applications, advantages, and limitations. What Is a PLC? A Programmable Logic Controller (PLC)...
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Harmonic Distortion in VFD: Causes, Effects and How to Reduce It

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Variable Frequency Drives (VFDs) have become essential in modern industrial facilities. They provide precise motor speed control, reduce energy consumption, improve process performance, and help extend the operational flexibility of pumps, fans, compressors, conveyors, and many other motor-driven applications. However, VFD technology also introduces a power quality challenge that engineers and maintenance teams cannot ignore: harmonic distortion . A VFD does not draw electrical current from the power supply in the same smooth, sinusoidal waveform associated with a simple linear load. Instead, its internal power electronics convert AC power to DC and then invert that DC power back into a variable-frequency AC output for the motor. This switching and conversion process can distort the current waveform and introduce harmonic components into the electrical system. If harmonic distortion is not properly evaluated and controlled, it can contribute to overheating, increased electrical losses,...
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Industrial Automation in Mining: PLC, SCADA and DCS Applications

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Mining operations depend on complex electrical, mechanical, and process systems that must operate safely, continuously, and efficiently. Industrial automation in mining integrates PLC , SCADA, and DCS technologies to control equipment, monitor processes, reduce downtime, and improve operational visibility across the mine. From crushers and conveyors to pumping stations, ventilation systems, grinding circuits, and mineral processing plants, automation has become a critical part of modern mining infrastructure. What Is Industrial Automation in Mining? Industrial automation in mining refers to the use of control systems, instrumentation, industrial networks, software, and automated equipment to monitor and control mining processes with limited manual intervention. A modern mining operation can contain thousands of sensors, motors, variable frequency drives (VFDs), valves, pumps, protection devices, and control panels. Without an integrated automation architecture, collecting and managing ...
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