描述
根据PLC的程序扫描原则，PLC先左后右，先上后下的步序语句逐句扫描。当指令涉及到输入、输出状态时，PLC从输入映象寄存器中“读入”对应输入映象寄存器的当前状态，然后，进行相应的运算，运算结果再存入元件映象寄存器中，对元件映象寄存器来说，每一个元件会随着程序执行过程而变化。
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