IFM OGD582 - Sensor Functions; Output Function Hysteresis; Sensor Alignment for Moving Objects

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UK
3.3.3 Sensor alignment to moving objects
Photoelectric sensors have to be installed in a way to ensure that the object is
moved into the detection range of the sensor from the side or from the bottom�
Background:
• When the object approaches from the top, it initially covers part of the receiver
lens without being detected by the light spot� So far, the sensor only "sees" the
background�
• If the object completely covers the receiving lens without the light spot
detecting the object, the sensor cannot "see" the background any more� The
sensor provides the error indication [--], as no signal is detected any more�
When the object approaches further, it is eventually detected�
Avoidance of the error indication by increasing the parameter [dFO]
(→ 10.3.7 Set the fault suppression time)�
4 Functions
This photoelectric distance sensor has two switching outputs OUT1 / OUT2� With
the basic setting (logic function = OFF), the status of the switching outputs is
determined by one measurement parameter each�
1� Status OUT1 (pin 4) is determined on the basis of the measurement parameter
"distance"�
2� Status OUT2 (pin 2) is determined on the basis of the measurement parameter
"reflectivity"�
4.1 Output function hysteresis
The hysteresis keeps the switching status of the output (distance or reflectivity)
stable if the measured value varies about the sensing range or the switching
reflectivity� Both outputs (OUT1 and OUT2) can be set as hysteresis function (→
10�2�5 Set the switch point for the hysteresis function OUT1 /OUT2)�
The object is detected if the switch point (distance) is not reached (object
is "near")�
The object is detected if the switch point (reflectivity) is exceeded (object is
"bright")�