HEIDENHAIN IK 5494-2D - Manual (Page 103)

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Probes
Changing edge detection order
Edges are detected as the scan moves from light to dark, from dark to light or automatically when the first
edge is encountered. Edge detection order is selected
from the VED toolbar.
Double-clicking a probe cycles the edge detection order of the
probe as shown here.
The edge detection order is indicated by the colors of the two
halves of each video probe.
The edge detection order must be consistent with the scan direction. For example, if the scan direction
(from cleanest to noisiest) is from a dark area of the image to a light area, the edge detection order must be
set to dark to light or first edge. When the edge detection order is inconsistent with the scan direction, no
points will be acquired.
by probe arrows in the dark
Dark to light order is indicated
by probe arrows in the light
First edge is indicated by a
single color probe
Dark to light is consistent with
the scan direction: probe fires
Automatic first edge: probe fires
Light to dark is not consistent
with the scan direction: probe
does not fire
Using Video Probes