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A20B-2902-0210

放大字体  缩小字体 时间:2018-02-11 10:43:40  来源:福州卓凯  作者:福州卓凯电子科技有限公司  发布者: 福州卓凯电子科技有限公司
核心提示:A20B-2902-0210】A20B-2902-0210 A20B-2902-0210
A20B-2902-0210

PLC是采用“顺序扫描,不断循环”的方式进行工作的。即在PLC运行时,CPU根据用户按控制要求编制好并存于用户存储器中的程序,按指令步序号(或地址号)作周期性循环扫描,如无跳转指令,则从第一条指令开始逐条顺序执行用户程序,直至程序结束。然后重新返回第一条指令,开始下一轮新的扫描。在每次扫描过程中,还要完成对输入信号的采样和对输出状态的刷新等工作。

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