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Control loop, closed

In a closed loop, the desired value is continuously compared to the actual value.

w: Set point value or reference variable (required filling level)

x: Actual value or controlled variable (measured filling level)

xw: Control deviation (actual value - set point value), also known as xd

y: Controller out put signal (control variable)

z1: Disturbance variable 1 (outflow from the tank)

z2: Disturbance variable 2 (evaporation of liquid from the tank)

During a control operation a physical variable (e.g. temperature, pressure etc.) is constantly measured and compared to a set point of the variable. The aim is to cause a matching of these two values.

This closed sequence of actions is called closed-control loop.

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