利用控制自动生产系统工艺过程的可编程控制器的富余资源 ,加上极少的外部电路完成生产系统辅助设备电保温炉的温度控制。重点介绍控制实现的方法 Using the surplus resources of the programmable controller that controls the process of automatic production system, and with very few external circuits, the temperature control of the electric holding furnace of the production system auxiliary equipment is completed. Focus on the method of control