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Basic Usage
Setting the Threshold (Teach Function)
Mechanism of the Threshold Setting
The threshold is set to the value in the middle of the received light amounts of the first and second points.
Example) Diffuse reflective fiber unit
Executing the teach function with an object present and without an object present results in the
following results, the threshold is set to the median value, 600.
• Received light amount when the teach function is executed for the first point (with an object
present): 1000
• Received light amount when the teach function is executed for the second point (with no object
present): 200
1000
600
200
* If the object is a dark color and the background is a bright color, the high/low received light amounts may
occur in the opposite manner as described here.
Example) Through-beam fiber unit
Executing the teach function with an object present and without an object present results in the
following results, so the threshold is set to the median value, 550.
• Received light amount when the teach function is executed for the first point (with no object
present): 1000
• Received light amount when the teach function is executed for the second point (with an object
present): 100
100
550
1000
Threshold
Second point (without an object
present)
First point (with an object present)
Received light amount
Object present
No object present
Threshold
Second point (with an object
present)
First point (with no object present)
Received light amount
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