What is the main function of a controller?

The main function of a controller is to maintain a set point. In various systems, a controller is responsible for regulating variables such as temperature, pressure, flow, or level to ensure they remain at desired levels, known as set points. It continuously compares the current state of the system with the set point and makes adjustments as needed to correct any deviations. Through this feedback loop, the controller ensures that the system operates efficiently and safely within its desired parameters.

This vital role is especially important in automated systems, where consistent performance and stability are required. By maintaining the set point, the controller helps avoid the adverse effects that can result from fluctuations in system parameters.