6GK1143-0TA02
6GK1143-0TA02
6GK1143-0TA02
本例所示的停车场在你离开时作一次付费操作。离开车辆的司机把打孔卡放入出口处的机器中,机器计算停留的时间长度。打孔卡上有多种数据,但是为了储存在I/O上,输入多次被使用。每条新数据线只在它对应的输出被激活时才被读入,即每条有洞的线依次被检测。洞的位置和数量决定存储的数据值是。所用到的检测技术可以是光学的,即:把检测器暴露在通过洞孔的光线中或检测金属通过洞孔,这只是许多可用技术中的两种。
当存储数据作为一个位模式读入时,它被重组为一个数字值,从而计算停留时间、费用等。
检测器/输入的位置混合起来,目的是实现一定程序的安全性。当检查打孔卡片时,使用的位模式不容易辫认,对于顾客来说,“增加”自己的洞孔,即改变进入时间,从而缩短停车时间和降低停车费用,是非常困难的。
注意:M000是一个控制标志,用以初始化单个读操作。M000在程序别的地方被复位。
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