Photoelectric distance sensor
OGD25x OGD55x
7
4 Function
The device shows the currently measured object distance or alternatively the object reflectivity in the
display. It generates output signals according to the parameter setting. Moreover, it provides the
process data via IO-Link.
The device is designed for fully bidirectional communication. So the following options are possible:
•
Remote display: reading and displaying the current distance / reflectivity.
•
Remote parameter setting: reading and changing the current parameter setting.
4.1 Assigning measurement parameters to a switching output
The device has two switching outputs, OUT1 / OUT2.
Via the parameters [SEL1] / [SEL2], a measurement parameter can be assigned to each switching
output.
e.g.
Parameter
Switching output
Setting
Measured value
[SEL1]
OUT1
[dist]
Distance
[SEL1]
OUT1
[refl]
Reflectivity
[SEL2]
OUT2
[dist]
Distance
[SEL2]
OUT2
[refl]
Reflectivity
4.2 Output function hysteresis
The hysteresis keeps the switching status of the output stable if the measured value fluctuates around
the switch point. Both outputs (OUT1 and OUT2) can be set and taught as hysteresis function. The
switching output (OUT1 and OUT2) states are derived based on the measurement parameters
“distance” or “reflectivity”. The measurement parameter can be selected individually for each switching
output.
4.2.1 Hysteresis function – distance
The selected switch point [SPx] is the set point. The reset point is automatically set above the selected
switch point [SPx] by the sensor. The nominal distance between set point and reset point is the
hysteresis, it is indicated in the data sheet. The hysteresis depends on the reflectivity of the
background.
Example Hno
1
For the output function [Hno] the output switches when the object approaches and when the set point (A) is reached.
2
When the object is removed again, the output does not switch back before the reset point (B) is exceeded. The reset
point (B) is above the set point (A).
1
B
A
