关键词: PLC, 变频器, 触摸屏, 特殊功能模块

Abstract: By analyzing the limitation and shortage of energy saving in the work of central air conditioning in which two different energy-saving technical schemes are proposed. Such as half frequency conversion scheme and full frequency conversion scheme. After the comparison of energy-saving effect and calculation of power consumption, an ideal scheme is finally determined. Finally, through designing the software, producing human-computer interface and debugging we find that the reliability and economics of the central air conditioning circulating system is obvious.

Key words: PLC, Frequency converter, Touch screen, Special function module