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6 TEACH/SET
Two-Point Static TEACH
• Two-Point Static TEACH locates a single switching threshold
(switchpoint) centered between the two taught conditions, with the
Output ON condition on one side, and the Output OFF condition
on the other.
• During Two-Point Static TEACH, the first condition taught is the
ON condition. Output ON and OFF conditions may be reversed by
switching the TEACH order or by changing the Light/Dark Operate
setting.
• Two-Point Static TEACH is recommended for applications where
two conditions can be presented individually.
Darkest
(no signal)
Most Light
(saturated
signal)
Output OFF Output ON
2nd Taught
Condition
1st Taught
Condition
Sensor positions
threshold between
presented conditions
Figure 12. Two-Point Static TEACH
Dynamic TEACH
• Dynamic TEACH locates a single switching threshold (switchpoint)
centered between the two taught conditions, with the Output ON
condition on one side, and the Output OFF condition on the other.
• During Dynamic TEACH, the Output ON state (Light or Dark
Operate setting) remains as it was last configured. Self-Contained
Models: Output ON and OFF conditions may be reversed by
switching the TEACH order or by changing the Light/Dark Operate
setting.
• Dynamic TEACH is recommended for applications where a
machine or process may not be stopped for configuration.
Darkest
(no signal)
Most Light
(saturated
signal)
Output OFF Output ON
2nd Taught
Condition
1st Taught
Condition
Sensor positions
threshold between
presented conditions
Figure 13. Dynamic TEACH
Window SET
• In Window SET, the single ON condition window extends above
and below the presented condition by the user selectable offset
percentage :
◦
Self-contained models: 30% default
◦ Opposed-mode models: 50% default
• Output ON and OFF conditions may be reversed by changing the
Light/Dark Operate setting.
• Lighter or darker conditions outside of the window cause the
output to change state.
• Window SET is recommended for applications where the target to
be sensed may not always appear in the same place, or when
other unwanted signals may appear.
Darkest
(no signal)
Most Light
(saturated
signal)
Single
Presented
Condition
Output OFF Output OFF
Output
ON
Sensor positions
window thresholds
at offset % of the
presented condition
Offset %
Figure 14. Window SET
WORLD-BEAM QS18 Expert with IO-Link
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