Abstract
Programs the controller, because it is day by day obvious in the industrial control aspect's application significance, it has the translation to be simple, the function is formidable, the use is reliable, service simple and so on many merits, and has substituted for the relay electric circuit's logical control gradually in many places. Meanwhile, the refrigeration type central air conditioning widely is also being applied, in realizes in its 22 union's situation the central air conditioning temperature intellectualized control, not only promoted the technical development, also raised the living standards.
key word: PLC control system temperature sensor compressor
