OGD25x OGD55x
Photoelectric distance sensor
8
2
A
B
A:
Set point
B:
Reset point
The object is detected if the switch point (distance) is not reached.
Switching status of the outputs
Output function
Object distance (D)
Switching status
[Hno]
D < [SPx]
Closed
D > [SPx] + hysteresis
Open
[Hnc]
D < [SPx]
Open
D > [SPx] + hysteresis
Closed
4.2.2 Hysteresis function – reflectivity
The selected switch point [SPx] is the set point. The reset point is automatically set below the selected
switch point [SPx] by the sensor. The nominal reflectivity difference between set and reset point is the
hysteresis which is indicated in the data sheet.
Example Hno
For the output function [Hno] the output switches when the object reflectivity increases and when the
set point (A) is reached.
When the object gets darker, the output does not switch back before the value is below the reset point
(B). The reset point (B) is smaller than the set point (A).
2
1
A
B
1
Laser beam
A:
Set point
2
Direction of movement of the object
B:
Reset point
If the output function [Hnc] has been selected, the set and reset points are reversed. The output
switches on if the object reflectivity is decreased. If the object reflectivity is increased, the output
switches off.
The object is detected if the switch point (reflectivity) is exceeded.
