FBM14 P0400YQ

详情描述：

FBM14 P0400YQ

FBM14 P0400YQ

FBM14 P0400YQ

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。

PLC的一个扫描周期必经输入采样、程序执行和输出刷新三个阶段。

PLC在输入采样阶段：首先以扫描方式按顺序将所有暂存在输入锁存器中的输入端子的通断状态或输入数据读入，并将其写入各对应的输入状态寄存器中，即刷新输入。随即关闭输入端口，进入程序执行阶段。


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