使用%AI的值作为MUL_ DINT的输入值也不能运算，因为32位的IN1将同时合并2个模拟量输入。为了解决这个问题，你可以把模拟输入移至一个双寄存器的低字，接着检验符号，如果符号检验为正的则设置第二个寄存器为0，检验为符号则设置为-1。然后使用由一个MUL_ DINT建立的双寄存器，MUL_DINT给出一-个32位结果，也可以和后面的DIV_DINT功能块–起使用。
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