ADJUSTMENT DEVICE, CONTROL METHOD, AND CONTROL PROGRAM

A controller includes a manipulated value determination unit for selectively determining a first manipulated value or a second manipulated value in accordance with a preset parameter so that a process value obtained from a controlled object follows a target value, and a tuning unit for alternately outputting the first manipulated value and the second manipulated value in accordance with the process value and determining the parameter from a response characteristic obtained through the alternate output. The tuning unit successively changes a magnitude of the first manipulated value each time output is switched during the alternate output of the first manipulated value and the second manipulated value, and determines the parameter from a response characteristic obtained when it is determined that the first change in the controlled value to the first manipulated value has linearity.