Fastus D4RF Series, Руководство пользователя

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3-40
Frequently Used Functions
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Number of Connectable Units with Cross Talk Prevention
Affected by Response Time Setting
When the inter-connection main unit and expansion units are connected, the cross talk prevention function
activates to prevent errors due to light from adjacent fiber units.
The number of main and expansion units that can be connected while still preventing cross talk varies
depending on the response time setting, so refer to the following table to set the response time.
Response time 22 µs 70 µs 250 µs 500 µs 1 ms 2 ms 8 ms
Number of
connectable units
with cross talk
prevention
2 3 4 9 9 12 14
3-7-3 [P2] Hold Display
Maintains and displays the peak level (highest value) and bottom level (lowest value) of received light
amounts after exceeding or falling below the thresholds.
240
220
ڂ
200
220
ڃ
MEMO
Hold function characteristics
• Even when the received light amount fluctuates greatly, the peak and bottom levels are displayed, making it possible to
determine the difference between the received light amount and the threshold at all times.
• The received light amount with an object present and with no object present can be checked, making it easier to
determine if the set threshold is appropriate.
• Even when the hold display is in use, detection results are output with the same timing as for the standard display.
„
Selectable Options
You can select from the following hold display modes.
Selectable
option
Function description
Off (default value) The hold display is not used.
Peak/bottom Continuously displays the peak level from times when the received light amount exceeded the
threshold and the bottom level from times when the received light amount dropped below the
threshold. (Refer to page 3-42.)
Peak Continuously displays only the peak level from times when the received light amount exceeded
the threshold. (Refer to page 3-43.)
Bottom Continuously displays only the bottom level from times when the received light amount dropped
below the threshold. (Refer to page 3-43.)
Time Displays the peak level from times when the received light amount exceeded the threshold and
the bottom level from times when the received light amount dropped below the threshold. The
display switches between these values once per second. (Refer to page 3-44.)
Bottom level Peak level Threshold Threshold
The peak level/bottom value is displayed, instead of the present received light amount.