Working of PID controller Working of PID Controller However, this controller is more steady & accurate as compared to the ON/OFF type controller.

The output is not stable in this kind of controller and it will swing frequently in the region of the fixed point. Similarly, it will turn OFF once the value is higher than a fixed value. Once the process value is lower than the fixed point, then it will turn ON. In the ON/OFF type controller, simply two conditions are obtainable to manage the system. This controller provides good results as compared with the ON/OFF type controller.

This procedure will continue till the error reaches Zero otherwise the value of the feedback variable becomes equivalent to a fixed point. Based on that, it alters the system output. This system evaluates the feedback variable using a fixed point to generate an error signal. A closed-loop system like a PID controller includes a feedback control system.