QS30 Series Diffuse-Mode Laser Sensor
6
P/N 109027 rev. C
Banner Engineering Corp.
•
Minneapolis, MN U.S.A.
www.bannerengineering.com • Tel: 763.544.3164
Dynamic TEACH and Adaptive Thresholds
• Teach on-the-fly
• Sets a single switching threshold
• Threshold position is adjustable using “+” and “-” buttons (Manual Adjust)
Dynamic TEACH is best used when a machine or process may not be stopped for
teaching. A variation of two-point TEACH, it programs the sensor during actual
machine run conditions, taking multiple samples of the light and dark conditions and
automatically setting the threshold at the optimum level (see Figure 3).
Dynamic TEACH activates the sensor’s adaptive threshold system, which continuously
tracks minimum and maximum signal levels, and automatically maintains centering of
the switch point between the light and dark conditions. The adaptive threshold system
remains in effect during RUN mode. The adaptive routine saves to non-volatile
memory at least once per hour.
When Dynamic TEACH mode is used, the Output ON state (light or dark operate) will
remain as it was last programmed. To change the Output ON state, use SETUP mode
(see page 8).
The sensing set point may be adjusted (fine-tuned) whenever the sensor is in RUN
mode by clicking the “+” and “-” buttons. However, when a manual adjustment is
made, the adaptive threshold system is disabled (cancelled).
Push Button
Remote Line
Display Shows
• Press and Hold
• Hold remote line
low (to ground)
Power LED: OFF
Bargraph: #7 & 8 flashing
• Present Output
ON and OFF
conditions
• Continue to hold
• Present Output ON
and OFF conditions
• Continue to hold
remote line low (to
ground)
Power LED: OFF
Bargraph: #7 & 8 flashing
Access
TEACH
Mode
Learn
Output
ON and OFF
• Release
• Release remote
line/switch
Teach Accepted
Power LED: ON
Bargraph: One LED flashes to show
relative contrast (good contrast
shown; see table above)
Sensor returns to RUN mode with
new settings
Finish
Learning
Teach Unacceptable
Power LED: OFF
Bargraph: #1, 3, 6, 8 flash to show fail
Sensor returns to RUN mode
without changing settings
Sensor positions
threshold midway
between taught conditions
Darkest
(no signal)
Most Light
(saturated
signal)
Output OFF
Output ON
Darkest Taught
Condition
Lightest Taught
Condition
Position
adjusted by
Manual Adjust
Figure 3. Two-Point Dynamic TEACH
(Light Operate shown)
Bargraph
LED
Number
Relative Contrast/
Recommendation
6 to 8
Excellent:
Very stable operation.
4 to 5
Good:
Minor sensing variables will
not affect sensing reliability.
2 to 3
Low:
Minor sensing variables will
affect sensing reliability.
1
Marginal:
Consider an alternate
sensing scheme.
