在使用MUL和DIV功能时应小心注意避免溢出。如果你不得已把INT值转换至DINT值，记住CPU使用带有正负号的标准2’S补码,其延伸至第2个字的最高位。必须检验低16位字的正负号,并将它延伸至第2个16位字。如果在一16位INT字中最有效的位为0(正),则把0送至第2个字。
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