I tried this and only one side works
if (sig1 > 1800)
armrobot = HIGH;
else if (sig1 < 1200)
armrobot = LOW;
if (sig6 < 900)
plowup = HIGH;
else if ((sig6 < 1400)&&(sig6 >1500))
plowup = LOW;
**if (sig6 > 1800)**
** plowdown = HIGH;**
** else if ((sig6 > 1400)&&(sig6 <1500))**
** plowdown = LOW;**
only the down (Bold) works