In a PID system, the Plant is considered to be the physical system for which the feedback control and PID functions adjusts for.
Looking at the higher level flow there is a set-point that goes into a summation that figures out how far from the set-point it is in comparison with the current value. This different, or error, is then sent to the PID Controller which then sends adjustment to the Plant which is the physical system. The Plant changes some settings and then sends the current value as feedback out so cycle can continue.
Note: In the Plant System.VI in the sample, all scale factors are in percent.
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