读特殊功能模块指令使用说明：

①
 读特殊功能模块指令FROM的目标操作数为KnY、KnM、 KnS、T、C、V、D和Z。

②
 接在FX系列PLC基本单元右边扩展总线上的功能模块，从最靠基本单元的那个开始，其编号m1依次为0～7。n是待传送数据的字数，n＝1～32（16位操作）或1～16（32位操作）

③
 图1a中，X0为ON时，将编号为m1的特殊功能模块内编号为m2开始的n个缓冲寄存器（BFM）的数据读入PLC，并存入[D]开始的n个数据寄存器中。M2是特殊功能模块中缓冲寄存器的首元件号，m2=0～32767，n是待传送数据的字数， n=0～32767。

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