Fastus D4RF Series, Руководство пользователя

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4-18
[S7] Detection
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Adjustment Example
The threshold is automatically adjusted when the received light amount decreases due to contamination,
temperature changes, etc.
Received light amount
Time
Reference received light amount
Threshold
Present received light amount
The received light amount
decreases due to contamination,
temperature changes, etc.
The received light amount recovers
when some measure is taken, such
as cleaning the optical system.
The threshold is adjusted correspondingly when
the reference received light amount changes
following the present received light amount.
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Selectable Options
Selectable option Function description
Off (default value) The ASC function is not used.
On - standard When the received light amount changes, the threshold is adjusted by 1 every 3 seconds.
On - fast When the received light amount changes, the threshold is adjusted by 1 every 1 second.
On - max When the received light amount changes, the threshold is adjusted by 1 every
0.25 seconds.
4-6-5 [S7] - [D5] Emitter power
This functions adjusts the light emittance level of the LED.
This enables detection by lowering the emitter power, thus lowering the received light amount when,
regardless of object presence the detection cannot be made due to saturation by too much of received light
amount.
It is effective when the emitter and receiver of a through-beam fiber unit are installed very closely and for
diffuse reflective fiber units installed close to the object and background.
MEMO
Saturation refers to the situation where the object cannot be detected because there is no difference in the light amounts
with and without an object due to the received light amounts being too large.