Terms in a controller


#1

a)Measurement variable
b)Desired variable
c)Deviation
d)Output

Measurement variable: It is the demand variable measured and controlled.

Desired Variable: it is the demand signal (set point) to which the process variable is controlled.

Deviation: it is the error signal caused by the difference between the measurement and the demand signal.

Output: It is the corrective signal from the controller to the final control element.