Remote terminal units (RTUs) are more advanced versions of PLCs. They can be used in a wide array of more localized applications, ranging from controlling simple lighting functions to performing more complex automation tasks required by environmental systems or chemical processing plants. PLCs have been an integral part of factory automation and industrial process control for decades. A programmable logic controller (PLC) is an industrial solid-state computer that monitors a variety of analog and digital inputs and outputs, processes signals and coverts data into a usable format.Īll of the PLC’s components and functions are centered around the controller, which is programmed using ladder logic to complete a specific task or make logic-based decisions for automated processes or machines.
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