Rockwell Automation 42JT VisiSight Photoelectric Color Mark Sensors - Manual (Page 2)

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Sensor Alignment
Position the 42JT VisiSight contrast sensor so that the distance
from the object to the sensor is 12 mm. High reflectivity surfaces
can impact the reliability of the color mark detection. We
recommend that you angle the sensor 10° to help improve the
color mark detection as shown below.
VisiSight™ Configuration
The 42JT VisiSight is configured using the pushbutton (or Remote
Teach) and the LED indicators on the sensor. There are four
features that can be configured:
• Static Teach
• Dynamic Teach (running process)
• Light operate (LO) or dark operate (DO) output
• Pushbutton lock/unlock
The sensor output is disabled during Teach.
Teach
Teaching the color mark is a two step process:
1. Teach the color mark (first condition).
Place the sensor 12 mm (0.47 in.) from the color
mark and aim it at the mark. Press and hold the
button for three seconds, until the yellow LED starts
flashing. Release the button.
Although the sensor will operate within a tolerance
of +/-2.5 mm (0.1 in.) from the focal distance, the
sensor should be installed at 12 mm (0.47 in.) for
optimal performance.
10º
t > 3 s
2. Teach the background (second condition).
Dynamic Teach (Running Process)
If the targets to be detected are moving with the sensor aimed at
the running process, press and hold the button for three seconds,
until the yellow LED starts flashing. The color mark will
automatically be taught in the next 30 seconds provided the
sensor sees two cycles of mark and background.
Teach Light Operate (L.O.) or Dark Operate (D.O.)
The default setting of the output is Light Operate (L.O.: output ON
when the color mark is detected after being taught.)
If the application requires the output to turn OFF when the color
mark is detected, the setting may be changed to Dark Operate
(D.O.)
1. To access the teach output mode setting:
Present the background to the sensor. Press and
release the button. The teach process is complete.
If the push button is not pressed within 30 seconds,
the sensor exits teach mode and returns to RUN
mode without learning the new setting.
However, if the contrast of the color mark vs. the
background is not sufficient (e.g., a yellow mark on a
white background) the sensor is unable to detect the
color mark. If that is the case, the white LED (light
spot) flashes 10 times.
A flashing white LED (light spot) indicates the
following:
Flashes (10 times): insufficient contrast level
Flashes (3 times): small contrast level
No flashing: good contrast level
If the white LED flashes, angle the sensor 10° (see
“Sensor Alignment,” at left), and repeat the teach
process.
If the sensor is still unable to detect the color mark
and indicates “insufficient contrast level,” a higher
end sensor may be necessary, such as the 45CRM
color mark sensor.
Press and hold button for six seconds, until green LED starts
flashing. Release the button. The current setting is indicated by
the yellow LED:
L.O.: Yellow LED ON
D.O.: Yellow LED OFF
t < 0.5 s
t > 6 s