3703E
PLC的工作就是对一段程序连续扫描。我们可以把这种扫描看成包括三个重要的步骤。虽然肯定不止三个步骤,但是我们集中精力考虑重要的部分,而不用担心其余的部分。其余部分的典型作用是作系统检查和刷新当前内部计数器和定时器的值。
步骤1-检查输入状态:首先,PLC检查一下每个输入点,看它们是闭合还是打开。换句话说,连接到个输入点的传感器闭合吗?***个呢?第三个呢?......它将这些数据存入内存,以备在下一步使用。
步骤2-执行程序:然后,PLC执行你的程序,每次执行一步。你的程序或许是这样的:如果个输入点闭合,那么闭合个输出点。因为程序已从上一步中知道输入的开关状态,所以它能够根据个输入点的状态,决定个输出点是否应该闭合。PLC将执行结果存起来以备下一步使用。
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