PLCs, PACs

PLCs, PACs January 1, 1970

Noise and disturbances in process control

Were it not for noise and disturbances, a feedback controller could fairly easily maintain output of the controlled process (process variable) close to its desired value (setpoint). However, forces other than the controller's efforts can often change the process variable. An example is sun shining in on a room cooled by an automatic air conditioner.

By Staff