描述
输出映象存储器（Q）是以字节为单位的寄存器，它的每一位对应于一个数字输出量结点。PLC在执行用户程序的过程中，并不把输出信号随时送到输出结点，而是送到输出映象存储器，只有到了每个扫描周期的末尾，才将输出映象寄存器的输出信号几乎同时送到各输出结点。使用映象寄存器优点：①同步地在扫描周期开始采样所有输入点，并在扫描的执行阶段冻结所有输入值
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