西门子 200plc 通过 modbus 协议与组态王通讯时，组态王中定义的寄存器地址与plc 地址是如何对应的？
映射关系如下：0－Q，1－I，3、4、8、9－V；
3,4,8,9 的 dd 号与 PLC 中 V 寄存器的偏移地址（实际地址-1000）的对应关系：组态王中（寄存器的 dd 号-1）*2=PLC 中的 V 寄存器的偏移地址。组态王中 40031对应 PLC：VW1060 (组态王中寄存器 4 表示 SHORT 型变量)组态王中 90640 对应 PLC：VD2278 (组态王中寄存器 9 表示 FLOAT 型变量)。
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