HEIDENHAIN ND 281 B v.2 - Manual (Page 45)

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Distance-to-Go Mode
Distance-to-Go 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 24 65 82.
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
ä Select datum point 2.
ä Enter the nominal position.
➤ Move the axis until the display value is zero.
1) Only in linear measurement mode
t
d2
t
d1