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摘要 针对工艺性空调温湿度控制的特殊性，提出了先进行含湿量控制、再进行温度控制的温湿度控制方案；介绍了实施此方案的空调系统组成和S7200 PLC的控制过程，并给出了控制程序。 关键词 PLC 温湿度控制 PID调节 空调系统 Design and implementation of temperature and humidity control system based on PLC By Zhang Ruping and Tang Yuzheng Abstract Based on the specific characteristics of temperature and humidity control of industrial air conditioning system, puts forward a control method of first controlling the moisture content and then controlling the temperature of the workshop. Presents the components of the air conditioning system and the controlling process using S7?200 PLC, and gives the control program. Keywords programmable logic controller, temperature and humidity control, proportional-integral-derivative regulation, air conditioning system