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介绍了一种可编程控制干燥系统的设计思想，分析了现场不同检测信号的提取方法，较详细叙述了顺序控制指令的用法并给出了预热、加温、冷却工序的程序梯形图
A design concept of programmable control drying system is introduced. The extraction method of different detection signals in the field is analyzed. The usage of sequence control instructions is described in detail and the program ladder of preheating, heating and cooling processes is given.