使用%AI的值作為MUL_ DINT的輸入值也不能運(yùn)算，因?yàn)?2位的IN1將同時(shí)合并2個(gè)模擬量輸入。為了解決這個(gè)問(wèn)題，你可以把模擬輸入移至一個(gè)雙寄存器的低字，接著檢驗(yàn)符號(hào)，如果符號(hào)檢驗(yàn)為正的則設(shè)置第二個(gè)寄存器為0，檢驗(yàn)為符號(hào)則設(shè)置為-1。然后使用由一個(gè)MUL_ DINT建立的雙寄存器，MUL_DINT給出一-個(gè)32位結(jié)果，也可以和后面的DIV_DINT功能塊–起使用。

 

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