Rockwell Automation 42FT Self-Teach Fiber Optic - Manual (Page 3)

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Two RUN switch positions are provided. For applications in
close proximity, alternate sensors should be set to alternate
RUN positions to reduce the possibility of crosstalk.
SENS
Allows Sensitivity to be increased (+) or decreased (–)
manually. See Manual Adjustment section for information.
HYS
Allows Hysteresis to be increased (+) or decreased (–)
manually. See Manual Adjustment section for information.
D.O./L.O. Switch
Selects Dark Operate or Light Operate sensor output.
OFF DLY/NORMAL Switch
OFF DLY position enables a 50ms off-delay on the sensor
output (“pulse-stretcher”). NORMAL disables the off-delay.
Indicators
As more light is detected, more indicators will illuminate.
Green “–1” 0.8X margin
Red “LIGHT” 1.0X margin
The Sensor Output changes state whenever
this indicator turns ON or OFF
Green “+1” 1.2X margin
Green “+2” 1.4X margin
Green “+3” 1.6X margin
Green “SET” Verifies adjustment inputs.
Alignment
All Sensing Modes—Mount the sensor securely. Attach the
fiber optic cable(s) to the sensor and fasten the sensing end
tip(s) loosely at the point where the target object is to be
sensed. Apply power to the sensor. Set the mode switch to
SET.
Diffuse Sensing—Place the target object in the position
where it is to be sensed. Watch the margin indicators and pan
the light source fiber optic cable up and down, left and right to
center it on the target. Secure the sensing end tip at the point
yielding the greatest margin.
Transmitted Beam Sensing—Secure the “receiver” firmly in
position. Watch the margin indicators and pan the “light
source” fiber optic cable up and down, left and right to center it
on the “receiver” fiber optic cable. Secure the “light source”
sensing end tip at the point yielding the greatest margin.
Retroreflective Sensing—Watch the margin indicators and
pan the fiber optic cable end tip up and down, left and right to
center it on the reflector. Mount the sensing end tip at the point
yielding the greatest margin.
Alignment Aid
A special alignment assistance feature visibly increases the
brightness of the sensor light source, as seen at the tip of the
fiber optic cable, whenever the amount of light received by the
sensor is sufficient for stable operation.
Reducing the Potential for Crosstalk
Crosstalk can occur when the fiber optic cables of two sensors
are positioned to sense at points close to each other. Adjust
each sensor independently while the other sensor is not
powered. Once adjusted set each sensor to a different RUN
position on the Mode Switch. (Note that two positions on the
Mode Switch are labeled RUN.)
Self-Teach
Self-Teach can be initiated using the pushbutton on the sensor
(Local) or through an external input (Remote) in the AUTO
mode. Only Local Self-Teach is possible in the SET mode.
Refer to the Mode Switch section for a description of each
Mode Switch setting.
Local Self-Teach
Moving Target Objects
1. Set Mode Switch to AUTO or SET.
2. Press and hold the SET button. The SET indicator flashes
rapidly for three seconds while the sensor prepares to
monitor the passing target objects then flashes more
slowly as the sensor actually monitors the light received
as the target objects pass. The sensor monitors the light
received as long as the button remains pressed.
3. Allow at least one target object to pass completely while
the SET indicator flashes slowly before releasing the
button. Automatic Sensitivity adjustment is complete.
(Note: Self-Teach will not occur if the button is released
early.)
4. Set Mode Switch to AUTO or one of the RUN positions
(see the description of operation in the Mode Switch
section.)
Stationary Target Objects
1. Set Mode Switch to AUTO or SET.
2. Remove the target object and press and release the SET
button. The SET indicator flashes continuously to confirm
that the “no target” signal is stored.
3. With the target object in its sensing position press and
release the SET button. The SET indicator stops flashing
to confirm that Local Self-Teach is complete.
4. Set Mode Switch to AUTO or one of the RUN positions
(see the description of operation in the Mode Switch
section).
Remote Self-Teach
1. Set Mode Switch to AUTO. An external signal or switch
closure can be used to automatically adjust sensitivity and
hysteresis via the pink External Set wire (refer to wiring
diagrams).
2. The adjustment procedure is the same as described in the
Manual Self-Teach section except that the external signal
or switch closure takes the place of manually pressing
SET button. The duration of External Set signal or switch
closure must be at least 100ms. The Stability Output
pulses to provide a verification signal which duplicates the
blinking of the SET indicator as described above.
3. Set Mode Switch to AUTO or one of the RUN positions
(see the description of operation in the Mode Switch
section.)
Manual Adjustment
Setting Maximum Sensitivity
1. Set Mode Switch to AUTO or SET.
2. Diffuse Sensing
Remove the target object and press and release the SET
button twice.
Transmitted Beam or Retroreflective Sensing
Completely block the beam from source to receiver or