Teach function
Description
Reference object
shape
You can use the “Reference object shape” (“Shape Ref. Object”) teach
function to teach in the shape of the reference object. Then the shape that
is taught in corresponds to a kind of “target shape” and serves as a basis
for the shape comparison.
Q
1
Good Teach
After both the length and the shape of the reference object have been
taught in, the desired switching threshold can be taught in using either good
or bad objects.
The teach function “Q
1
Good Teach” is used for teaching in the switching
threshold based on good objects. With this teach you can have one to as
many good objects as desired move past the sensor. Based on the good
objects that move past it, the sensor automatically saves the value of the
lowest match as a threshold, to be able to identify all good objects as such.
Q
1
Bad Teach
You can use the teach function “Q
1
Bad Teach” to teach in the switching
threshold based on bad objects. With this teach you can have one to as
many bad objects as desired move past the sensor. Based on the good
objects that move past it, the sensor automatically saves the value of the
lowest match as a threshold, to be able to identify all good objects as such.
In the case of the shape comparison, the display cannot be used for an
inverted teach. If necessary, however, the inversion can be done by man‐
ually changing the switching output behavior.
6.4.1.4.3
Manual settings
Setting
Description
Q
1
Logic
You can use the “Q
1
Logic”setting to manually select whether the output of
the shape comparison is to act as High Active (
Low Active (
Reference object
length
You can use the “Reference object length” (“Length Ref. Object”) setting to
set the length of the reference object in milliseconds.
Reference object
shape
The shape of the reference object cannot be entered manually. Accordingly,
the teach function for teaching in the shape of the reference object (
"Teachable settings (“Teach”)", page 38
) is available also for the manual
settings.
Shape trigger
threshold
The beginning and end of the object is detected directly by the sensor for
teaching in the length and shape of the reference object as well as for the
shape comparison function. This detection is based on the difference in
height between the background (e.g. a conveyor belt) and the object, which
is called the shape trigger threshold (“Self Trigger”).
This trigger threshold is set by default to a height of 25 mm. You can
manually adjust this height threshold in millimeters to detect even smaller
objects or hide larger height fluctuations of the background.
Shape tolerance
Q
1
You can use the shape tolerance Q
1
(“Q
1
Tolerance”) to manually set the
switching threshold for the shape comparison in the form of a percentage.
To enable estimation of the match level of various objects and setting
of a useful switching threshold based on this, it is advisable to measure
some objects in
Run
mode as a test and observe the results of the shape
comparison.
OPERATION
6
8017154/1AVV/2021-03-24 | SICK
O P E R A T I N G I N S T R U C T I O N S | DT50-2 Pro
39
Subject to change without notice
