Description
形成电流通路，就可能有几个电器同时动作。而PLC是以“串行“方式工作的，PLC在循环执行程序时，是按照语句的书写顺序自上而下进行逻辑运算，而前面逻辑运算的结果会影响后面语句的逻辑运算结果。因此梯形图编程时，各语句的位置也会对控制功能产生关键影响
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