Where does the error come from in PID control?

1. What is error in PID controller?
2. Which part of PID output depends only on present error?
3. What is error in process control?
4. Is PID proportional to error?

What is error in PID controller?

The error is simply the difference between the target value value and the actual value. For instance, if the target value is 75ºC , and the coffee is currently at 50ºC , then the error is 25 .

Which part of PID output depends only on present error?

Proportional (P) - The proportional term is directly proportional to the error at present.

What is error in process control?

Error is defined as the difference between set-point and process variable. (error) = (set-point) - (process variable) The output of PID controllers will change in response to a change in process variable or set-point. pH: A measure of how acidic or basic a solution is. pH is often a process variable to control.

Is PID proportional to error?

PID Theory

The proportional gain (K_c) determines the ratio of output response to the error signal. For instance, if the error term has a magnitude of 10, a proportional gain of 5 would produce a proportional response of 50.