Steady-state gain in process control

The steady-state gain of a system is simply the ratio of the output and the input in steady-state represented by a real number between negative infinity and positive infinity. When a stable control system is stimulated with a step input, the response at a steady-state reaches a constant level.

1. What is the difference between controller gain and process gain?
2. How do you get rid of steady state error?

What is the difference between controller gain and process gain?

Simply put: Process Gain is a model parameter whereas Controller Gain is a tuning parameter. The former describes important aspects of a given process' dynamic behavior. The later contributes to the PID controller's responsiveness to disturbances.

How do you get rid of steady state error?

This shows that the steady state error can be reduced by increasing the gain. However, to achieve zero steady-state error, the gain would have to approach infinity. Therefore, for a first order system, a proportional controller cannot be used to eliminate the step response steady state error. damping ratio.