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阐述了现有可编程序控制器在粮油工厂常用的大电机降压启动电路控制和提升“失速”检测报警方面的应用。有效地提高可编程序控制器的投资效益，减少其它设备的投资费用。
The application of existing programmable logic controller in control and promotion of “stall” detection and alarm of large motor buck-starter circuit commonly used in grain and oil industry is expounded. Effectively improve the investment efficiency of programmable logic controller, reduce the investment cost of other equipment.