The LOGO! is a small size general logic controller developed by Siemens Co., its main characteristics are small size, strong functions, easy operation and high performance-price ratio. It has wide application in many fields of small mechanical equipments, electrical equipments, control cabinets and installation projects etc.. The application of LOGO! controller in MCC soft starting of electric drive oil-drilling rig combined with specific one-for-four soft starting example is presented.%LOGO!是一种小型通用逻辑控制器,其主要特点有体积小、功能强、易于操作、性价比高等。在小型机械设备、电气装置、控制柜以及安装工程等多种领域应用非常广泛。介绍LOGO!在电传动石油钻机MCC软启动上的应用,并结合一拖四软启动控制的具体实例对LOGO!控制器的应用进行了说明。
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