西門子 200plc 通過 modbus 協議與組態王通訊時，組態王中定義的寄存器地址與plc 地址是如何對應的？
映射關系如下：0－Q，1－I，3、4、8、9－V；
3,4,8,9 的 dd 號與 PLC 中 V 寄存器的偏移地址（實際地址-1000）的對應關系：組態王中（寄存器的 dd 號-1）*2=PLC 中的 V 寄存器的偏移地址。組態王中 40031對應 PLC：VW1060 (組態王中寄存器 4 表示 SHORT 型變量)組態王中 90640 對應 PLC：VD2278 (組態王中寄存器 9 表示 FLOAT 型變量)。
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