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{{Short description|Feedback controller}}
[[File:Industrial control loop.jpg|thumb|300px|Example of a single industrial control loop; showing continuously modulated control of process flow.]]
[[File:Closed Control Loop.svg|thumb|300px|A Closed Loop Control consisting of Set Point <math>w(t)</math>, Measured Output <math>y_m(t)</math>, Measured Error <math>e(t)</math>, Controller Output <math>u(t)</math>, System Input <math>u_s(t)</math>, Disturbance <math>d(t)</math>, and System Output <math>y(t)</math>.]]
A '''closed-loop controller''' or '''feedback controller''' is a [[control loop]] which incorporates [[feedback]], in contrast to an ''[[open-loop controller]]'' or ''non-feedback controller''.
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