Patent ID: 7272452

Claim:
A distributed automation system for controlling components in a heating ventilation and air conditioning system comprising: a controller with a plurality of data processing components including at least one constrained input proportional-integral-derivative component and at least one unconstrained input proportional-integral-derivative component, each of the plurality of data processing components having a first input and an output and operable to process data input to the data processing component, wherein the first input to the at least one constrained input proportional-integral-derivative component is configured to be limited to a process variable resulting from an actual temperature measurement, and wherein the at least one constrained input proportional-integral-derivative component further comprises a second input; a room temperature set point device having an output operably connected to the second input of the at least one constrained input proportional-integral-derivative component, the room temperature set point device operable to apply an offset to a temperature set point signal in response to a received signal and to output the offset temperature set point signal; and a user interface operable to operably connect the output of at least one of the plurality of data processing components to the first input of another of the plurality of data processing components.