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论述可编程序控制器（ＰＣ）对矿井提升机行程监视和保护的基本原理；介绍ＰＣ系统的硬件构成及其功能；阐明用户软件的功能及整体流程
Discusses the programmable logic controller (PC) on the mine hoist travel monitoring and protection of the basic principles; introduces the hardware structure of the PC system and its functions; clarify the function of user software and the overall process