描述
把输入暂存器的信息读到PLC的内存中，称输入刷新。PLC内存有专门开辟的存放输入信息的映射区。这个区的每一对应位（bit）称为输入继电器，或称软接点，或称为过程映射输入寄存器（the process-image input register）。这些位（bit）置成1，表示接点通，置成0为接点断。由于它的状态是由输入刷新得到的，所以，它反映的就是输入点的状态。
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