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Why can you not catch the same cold twice, but a new cold will make you sick for a week or two?
Feedback Signal
A signal sent back to the control system from the output, used to correct or adjust the system to maintain desired performance.
Set Point
The desired or target value for a process variable in a control system.
Error Signal
A feedback signal indicating the difference between a desired setpoint and the actual output, used to correct system performance.
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