Autosen AL010 Notice D'utilisation page 33

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]
(→ 10.3.2 Setting of the fault suppression time for switching outputs).
4 Functions
4.1 Output function hysteresis
The hysteresis keeps the switching state of the output stable if the measured
value varies about the sensing range� Both outputs (OUT1 and OUT2) can be set
as hysteresis function (→ 10.2.4 Hysteresis function).
4.2 Output function window
The window function enables the monitoring of a defined acceptable range� Both
outputs (OUT1 and OUT2) can be set as window function → 10.2.8.
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