Light SET
• Light SET sets a threshold below the presented condition by the
user selectable offset percentage:
◦
Self-contained models: 30% default
◦
Opposed-mode models: 50% default
• Any condition darker than the threshold causes the output to
change state.
• In Light Operate mode, the presented condition is the Output ON
condition. In Dark Operate mode, the presented condition is the
Output OFF condition. Reverse the Output ON and OFF conditions
by changing the Light / Dark Operate setting.
• Light SET is recommended for applications where only one
condition is known, for example a stable light background with
varying darker targets, or in retroreflective applications.
Darkest
(no signal)
Most Light
(saturated
signal)
Output OFF
Output ON
Single
Presented
Condition
Sensor positions threshold
at offset % below the
presented condition
Figure 15. Light SET
Dark SET
• Dark SET sets a threshold above the presented condition by the
user selectable offset percentage
◦
Self-contained models: 30% default
◦
Opposed-mode models: 50% default
• Any condition lighter than the threshold causes the output to
change state.
• In Light Operate mode, the presented condition is the Output OFF
condition. In Dark Operate mode, the presented condition is the
Output ON condition. Reverse the Output ON and OFF conditions
by changing the Light / Dark Operate setting.
• Dark SET is recommended for applications where only one
condition is known, for example a stable dark background with
varying lighter targets, or when maximum excess gain is required.
Darkest
(no signal)
Most Light
(saturated
signal)
Output OFF
Output ON
Single
Presented
Condition
Sensor positions threshold
at offset % above the
presented condition
Figure 16. Dark SET
Opposed-Mode Models: Opaque Mode
Opaque mode is recommended for long range detection of opaque (light
blocking) targets. When Opaque mode is used, the sensor operates at
maximum sensing range regardless of the taught condition.
Darkest
(no signal)
Most Light
(saturated
signal)
Output OFF
Output ON
Fixed Threshold
Figure 17. Opaque Mode
WORLD-BEAM QS18 Expert with IO-Link
18
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