PID Loop Simulator: Tuning the PID Loop

Description| How it works| Derivative on PV| Process Model| Robustness| PID Tuning| PID Equations

Setting the PID parameters (controller gain, integral and derivative times) to achieve a desired process response is known as loop tuning. A well tuned loop takes the process value to the set point within the desired time frame, removes disturbances and can tolerate some variations or uncertainities in the process (i.e., it is robust).

Often measures of disturbances or uncertainities or even desired settling times are difficult to get and the control engineer has to have a feel for the process to tune the loop correctly. For this reason, loop tuning is considered both an art and a science.

While the art portion of tuning is developed with experience, there are many tools for the science part of the job. The System Identification and PID Loop Simulation tools at XlnControl make a great set of tools for the control professional.