Rockwell Automation 42JT User Manual

Installation Instructions

IMPORTANT: SAVE THESE INSTRUCTIONS FOR FUTURE USE.

Yel low LED

Pushbutton

Green LED

42JT VisiSight™ Photoelectric Color Mark Sensors

Default Settings:

Output Mode: Light Operate (Output ON when the color mark is

detected after being taught)

Output Type: PNP or NPN (Push-Pull)

Sensor User Interface

LED Status

The table below provides LED status in the RUN mode i.e., during
operation, the sensor is always in RUN mode, except when being
taught.

OFF Power is OFF

Green

Yel l ow *

*LED status shown when the load is connected as PNP. The LED status reverses when the load is

connected as NPN. (e.g. LED is ON when the output is de-energized and OFF when is energized)

Mounting the Sensor

Securely mount the sensor on a firm, stable surface or support.
An application which is subject to excessive vibration or shifting
may cause intermittent operation. For installation convenience,
Rockwell Automation offers a wide range of mounting brackets
(see the Accessories section for more details).

ON Power is ON

Flashing (1.5 Hz)

Output short circuit protection

OFF Output de-energized

ON Output energized

active

General Specifications

42JT-F5LET1-

Environmental

Certifications cULus and CE Marked for all applicable directives
Operating Environment IP67, IP69K
Operating Temperature [C (F)] -20…+60° (-4…+140°) 
Storage Temperature [C (F)] -20…+80° (-4…+179°)

Optical

Light Source Visible white LED

Sensing Range [mm (in.)] 12 (0.47)
Tolerance [mm (in.)] +/- 2.5 (+/- 0.1)
Spot Size [mm (in.)] 1 x 4 (0.4 x 0.15)
Adjustments Pushbutton

Electrical

Volt age 10… 30V DC
Current Consumption 25 mA max.
Sensor Protection Reverse polarity, short circuit protection

Outputs

Response Time 50 μs
Output Type PNP or NPN (Push-Pull)
Output Function Selectable light operate or dark operate
Output Current 100 mA max.
Output Leakage Current 10 μA max.

Mechanical

Housing Material ABS
Lens Material PMMA
Cover Material PMMA
Connection Types 2 m PUR cable, 4-pin DC micro (M12) QD on a 150 mm

PUR pigtail, 4-pin pico (M8) integral QD

Optional Accessories Mounting brackets, cordsets

 Replace with A2 for 2 m (6.6 ft) cable, F4 for 4-pin DC micro (M12) QD, or P4 on 4-pin DC pico

(M8) QD

 UL: -20…+50°C (-4…122°F)

Sensor Alignment

10º

t > 3 s

t < 0.5 s

t > 6 s

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.

2. Teach the background (second condition).

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.

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.

Te ac h

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.

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:

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.: Yello w LED OFF

2