描述
数字量I/O点的编址是以字长为单位，采用标志域（I或Q）、字节号和位号三部分的组成形式，在字节号和位号之间以点分隔，习惯上称做字节·位编址。每个I/O点就有了唯一的识别地址，地址的表示如图：数字量输入输出的字节和位编址都是从0开始，每个位都是0~7，共8位。
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