this is from manual of Conveyor Tracking Function:
$D004 : Present position of conveyor CV# (1)
$D005 : Present position of conveyor CV# (2)
$D006 : Present position of conveyor CV# (3)
$D007 : Present position of conveyor CV# (4)
$D008 : Present position of conveyor CV# (5)
$D009 : Present position of conveyor CV# (6)