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今天给我们说一个西门子事例——西门子S7-200SMART PLC怎样实现两灯交替闪耀

　　我们先来看看这个事例的具体要求：

　　运用定时器Q0.0和Q0.1，当按下发动按钮时Q0.0亮，1秒后Q0.0灭，同时Q0.1亮，再过两秒后Q0.1灭。以此循环，直到按下中止按钮，Q0.0和Q0.1全灭

　　首要画时序图。再用定时器加比较的办法会把很多杂乱的东西简单化

　　时序图便是表示地址或变量根据时刻的改变而改变的图形

　　整个占用的时刻为3秒，需要用到100毫秒定时器

　　设：定时器的当时值为X，0≦X﹤10的时候，Q0.0亮；当10≦X﹤30时，Q0.1亮。

　　接下来便是循环的问题，循环便是用最后一个状况作为第一个状况的发动条件。

　　定时器PT值为3秒(数值计作30)，运用TNO接通延时定时器，当当时值=设定值，状况输出为1时，即定时器状况位T37=1时，就去复位定时器，再从0开始，这个便是自复位，便是自己复位自己，到了3秒就从0开始。

　　最后整理下编写程序的思路：

　　1、 启停操控——输出发动标志位，输出为1，并保持(自锁)

　　2、 定时器操控——用发动标志位去接通定时器，让其作业

　　3、 比较——0-1秒Q0.0输出，1-3秒Q0.1输出

　　此外还有第二种办法哦，会运用到震荡电路(闪耀电路)以及两个定时器交替操控，一个操控接通时刻，一个操控断开时刻。
 

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