Banner Q4X User Manual

6 Additional Information
6.1 Dual (Intensity + Distance) Mode
In background suppression (DYN, 1-pt, 2-pt) and foreground suppression (FGS) TEACH modes, the Q4X sensor compares
changes in the measured distance between the sensor and target to control the output state. Dual TEACH mode, dual intensity +
distance window, expands the applications the Q4X can solve by combining distance-based detection with light intensity
thresholds. In dual TEACH mode, the user teaches the Q4X a fixed reference surface, and the sensor compares intensity and
distance readings against the reference surface it was taught. After teaching the reference target, the displayed value is calibrated
to 100P, or a 100% match. When an object enters the sensor’s
field of view, the degree of consistency with the reference surface
becomes lower and causes a change in sensor output.
In dual mode, you can detect when the target is present at the right distance and when it returns the right amount of light. This is
useful in error-proofing applications where you need to know not only that the part is present (distance), but also that it is the
correct part (intensity).
In dual mode, the Q4X requires a reference surface (far left). Once taught, the distance and intensity of the reference surface are
recorded and used as a baseline. A user adjustable switching threshold is set, and changes in distance and/or intensity outside the
switching threshold creates a sensor output change. The example above uses a 90% (90P) match condition with a 10% change in
intensity and/or distance from the reference surface required to change the output state. The default-switching threshold is a 75%
match to the reference condition (75P); this sets the threshold 25% from the distance and intensity of the reference surface. A
transparent object can be detected either by a change in intensity, distance, or by a double peak reflection (far right). When a
double peak
reflection is detected, the display alternates between
and the percent match.
Reference Condition
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10% Switching
Threshold
100% matched distance + Intensity after Dual teach
Intensity
(% of taught reference)
Distance (mm)
Change in Intensity
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Output switches with intensity change
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Distance (mm)
Change in Distance
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Output switches with distance change
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(% of taught reference)
Distance (mm)
Change in Distance and Intensity
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Output switches with intensity and distance change
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(% of taught reference)
Distance (mm)
Reduced Intensity and/or Second Peak
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Output switches with intensity and/or second peak (Clear Object Detection)
Intensity
(% of taught reference)
Distance (mm)
The Q4X sensor can be taught non-ideal reference surfaces, such as surfaces outside of the sensor’s range, very dark surfaces, or
even empty space. These situations may enable applications requiring a long range detection but are subject to typical diffuse
mode detection challenges.
6.2 Dual Mode Reference Surface Considerations
Optimize reliable detection by applying these principals when selecting your reference surface, positioning your sensor relative to
the reference surface, and presenting your target. The robust detection capabilities of the Q4X allows successful detection even
under non-ideal conditions in many cases. Typical reference surfaces are metal machine frames, conveyor side rails, or mounted
plastic targets. Contact Banner Engineering if you require assistance setting up a stable reference surface in your application.
1.
Select a reference surface with these characteristics where possible:
• Matte or diffuse surface finish
• Fixed surface with no vibration
•
Dry surface with no build-up of oil, water, or dust
2. Position the reference surface between 50 mm and the maximum sensing range for threaded barrel models or between 60
mm and the maximum sensing range for flush mount models.
3.
Position the target to be detected as close to the sensor as possible, and as far away from the reference surface as
possible.
4. Angle the sensing beam relative to the target and relative to the reference surface 10 degrees or more.
6.3 Dual Mode Considerations for Clear and Transparent Object Detection
The Q4X is able to detect the very small changes caused by transparent and clear objects. A transparent object can be detected
either by a change in intensity, distance, or by a double-peak reflection.
Q4X Stainless Steel Laser Sensor with Dual Discrete Outputs and IO-Link
36 www.bannerengineering.com - Tel: 763.544.3164

Banner Q4X Specifications

General

Sensing Mode	Diffuse
Input Voltage	10 V DC to 30 V DC
Output	NPN or PNP
Housing Material	Stainless steel
IP Rating	IP67
Connection Type	M12