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<p>systems, or DCSs, and <a href="page.php?w=programmable_logic_controller">programmable logic controller</a>s (PLCs), though SCADA and PLC systems are scalable down to small systems with few control loops. Such systems are extensively used in industries such as chemical processing, pulp and paper manufacture, power generation, oil and gas processing, and telecommunications.</p>

<p><big>Discrete controllers</big></p>
<p>The simplest control systems are based around small discrete controllers with a single <a href="page.php?w=control_loop">control loop</a> each.</p><p>
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