6SL3357-6TH41-4BA3
1. 直接控制：
在PLC输出端口接入2个继电器，通过两个继电器的某个状态来改变电动机正反转。
当K1和K2同时通电时，电机正转;当K2断电，K1闭合时，电机反转;当K1、K2均断电时，电机停止。
2. 间接控制：
在PLC输出端口接入2个继电器，将继电器接在独立的控制器中，通过控制器来控制电动机的正反转。
间接控制方式虽然比较复杂，但是具有更强的灵活性和扩展性。在工业自动控制系统中，通常采用间接控制方式。
6SL3357-6TH41-4BA3
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