描述
如果用PLC来控制这台三相异步电动机，组成一个PLC控制系统，根据上述分析可知，系统主电路不变，只要将输入设备SB1、SB2、FR的触点与PLC的输入端连接，输出设备KM线圈与PLC的输出端连接，就构成PLC控制系统的输入、输出硬件线路。而控制部分的功能则由PLC的用户程序来实现，其等效电路如图2所示。
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