Fastus D4RF Series, User Manual

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Basic Usage
Setting the Threshold (Teach Function)
3-4 Setting the Threshold (Teach Function)
Set judgment criteria used by this product to judge whether an object is present.
3-4-1 Threshold
Set according to the received light amount, the threshold is the standard value used to judge whether an
object is present.
The method for easy setting of this threshold with key operations and an external input on the fiber amplifier
is referred to as the teach function.
Example) Received light amount and threshold with a through-beam fiber unit
When the object blocks the light beam, the received light amount decreases. This level dropping
below the threshold is judged to indicate the presence of an object.
When an object is present, the light is blocked,
so the received light amount is low.
When no object is present, light can be
received, so the received light amount is high.
The received light
amount dropping to or
below the threshold is
judged to indicate the
presence of an object.
High
Threshold
Low
Received light amount
No object present Object present No object present