Manufacture of PID controllers has undergone many changes over the last decades. PID controllers have evolved from a pneumatic setup in the 1940’s to electrical ones and now modern microprocessors based devices. While the implementation has changed tremendously, the basic functions of controllers, the PID algorithm, has not and probably will never changed. For the user, the job of tuning the controller has also been essentially the same throughout the decades, although new PID designs have been continuously developed to cater to different sets of control requirements.
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