温度控制是许多机器的重要的构成部分。它的功能是将温度控制在所需要的温度范围内，然后进行工件的加工与处理。PID控制系统是得到广泛应用的控制方法之一，下面较为详尽地介绍了PID温度控制的
PLC程序设计实例。
(1) 系统组成
本套系统采用Omron的PLC与其温控单元以及Pro-face的触摸屏所组成。系统包括CQM1H-51、扩展单元TC-101、GP577R以及探温器、加热/制冷单元。
(2) 触摸屏参数设置
设002代表现在的温度，而102表示输出的温度。如按下开始设置就可设置参数。需要设置的参数有6个，分别是比例带、积分时间、微分时间、滞后值、控制周期、偏移量。它们在PLC的地址与一些开关的地址如下:
比例带 : DM51 积分时间 : DM52
微分时间 : DM53 滞后值 : DM54
控制周期 : DM55 偏移量 : DM56
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