1746-OB16E1746-OB16E

继电器接触器控制系统经过*的使用，已有一套能完成系统要求的控制功能并经过验证的控制电路图，而PLC控制的梯形图和继电器接触器控制电路图很相似，因此可以直接将经过验证的继电器接触器控制电路图转换成梯形图。主要步骤如下：

（1）熟悉现有的继电器控制线路。

（2）对照PLC的I/O端子接线图，将继电器电路图上的被控器件（如接触器线圈、指示灯、电磁阀等）换成接线图上对应的输出点的编号，将电路图上的输入装置（如传感器、按钮开关、行程开关等）触点都换成对应的输入点的编号。

（3）将继电器电路图中的中间继电器、定时器，用PLC的辅助继电器、定时器来代替。

（4）画出全部梯形图，并予以简化和修改。

这种方法对简单的控制系统是可行的，比较方便，但较复杂的控制电路，就不适用了。

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