HEIDENHAIN ND 281 B v.1 - Manual (Page 50)

50
Distance-to-Go Mode
Path
Distance-to-Go Display Mode 1)
Normally, the display shows the actual position of the en-
coder. However, it is often more helpful to display the re-
maining distance to an entered nominal position— especially
when you are using the display unit for machine tools and au-
tomation purposes. You can then position simply by traversing
to display value zero.
You can access the distance-to-go display by entering the
code number 246 582.
Function of switching outputs A1 and A2
In the distance-to-go mode, switching outputs A1 (pin 15) and
A2 (pin 16) have a different function: they are symmetrical to
the display value zero. For example, if a switching point of
10 mm is entered in P62, output A1 switches at both +10 mm
and –10 mm. The figure below shows output signal A1 when
approaching zero from the negative direction.
Time curve of a signal for switching limit (A1) = 10 mm,
t
d1
≤
30 ms, t
d2
≤
180 ms
Display Meaning
DELTA ON Distance-to-go display active
DELTA OFF Distance-to-go display not active
“Traversing to zero” with distance-to-go display
➤ ➤ ➤ ➤ ➤ Select datum point 2.
➤
➤ ➤ ➤ ➤ Enter the nominal position.
➤ Move the axis until the display value is zero.
1) Only in linear measurement mode
t
d2
t
d1