This paper introduces PLC to liquid mixing device which makes use of the Mitsubishi FX2N series,elaborates the control ing scheme,meantime,according to the liquid mixing device’s control ing requirements and characteristics,it confirms the al ocation of input and output,designs the trapezoidal chart and carries on the scene debugging.% 本文介绍了利用三菱FX2N系列PLC对液体混合装置的控制，阐述了控制方案，同时根据液体混合装置的控制要求和特点，确定PLC的输入输出分配，设计出梯形图并进行现场调试。
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