6RX1240-0AS00
6RX1240-0AS00
6RX1240-0AS00
如果在同一个程序中，同一元件的线圈使用了两次或多次，称为双线圈输出。对于输出继电器来说，在扫描周期结束时，真正输出的是后一个Y0的线圈的状态(见图1a)。
Y0的线圈的通断状态除了对外部负载起作用外，通过它的触点，还可能对程序中别的元件的状态产生影响。图1a中Y0两个线圈所在的电路将梯形图划分为3个区域。因为PLC是循环执行程序的，上面和下面的区域中Y0的状态相同。如果两个线圈的通断状态相反，不同区域中Y0的触点的状态也是相反的，可能使程序运行异常。作者曾遇到因双线圈引起的输出继电器快速振荡的异常现象
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