| Definition: | process whereby one variable quantity, namely the controlled variable is continuously or sequentially measured, compared with another variable quantity, namely the reference variable, and influenced in such a manner as to adjust to the reference variable Note 1 to entry: Characteristic for closed-loop control is the closed action in which the controlled variable continuously or sequentially influences itself in the action path of the closed loop. Note 2 to entry: This entry was numbered 351-26-01 in IEC 60050-351:2006.
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