从当前步执行到下一步，当前步不再激活，下一步变成激活的。 当某步是激活的那么将执行与该步相关的逻辑。这些逻辑以梯形图语言编 程。步与步之间条件转换也是用梯形图逻辑编程。某行是否流过逻辑电流由一组简单的程序控制，其工作原理与机械继电器和 输出线圈相类似。触点是否流过电流取决于程序中与该触点相关的地址值。
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