Which of the following statements is not necessarily correct for open control system ?

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Automatic Control topics include: Automatic control and its types, open loop and closed loop transfer functions. Automatic control systems maintain process variables, such as temperature, pressure, flow, and composition, at the desired operating value.  Here are some examples of automatic control machines: Programmable logic controller (PLC): An automatic controlling system that can replace hard-wired relay logic systems for machine control. It can be used as a process control system or distribution control system for industrial automation. Industrial robots: Multipurpose manipulator... Show more

Which of the following statements is not necessarily correct for open control system ?