描述
输入映象存储器（I）是以字节为单位的寄存器，它的每一位对应于一个数字量输入结点。在每个扫描周期开始，PLC依次对各个输入结点采样，并把采样结果送入输入映象存储器。PLC在执行用户程序过程中，不再理会输入结点的状态，它所处理的数据为输入映象存储器中的值。
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