if (((unsigned long)GetTagDouble (TAG_1)==1)&&((unsigned long)GetTagDouble (TAG_2)==0)&&((unsigned long)GetTagDouble (TAG_3)==0))
{
return 250;
}

if (((unsigned long)GetTagDouble (TAG_1)==0)&&((unsigned long)GetTagDouble (TAG_2)==1)&&((unsigned long)GetTagDouble (TAG_3)==0))
{
return 350;
}

if (((unsigned long)GetTagDouble (TAG_1)==0)&&((unsigned long)GetTagDouble (TAG_2)==0)&&((unsigned long)GetTagDouble (TAG_3)==1))
{
return 450;
}
else
{
return 210;
}
如上试试看！
你的变量TANK1、TANK2、TANK3是不是二进制变量？