Rockwell Automation Allen-Bradley VisiSight 42JT Series User manual

42JT VisiSight™ Photoelectric Sensors with IO-Link Interface
42JT-D*LAT1-*, 42JT-P*LAT1-* ,42JT-E2LAT1-*, 42JT-R*LAT1-*
User Manual

Important User Information
Read this document and the documents listed in the additional resources section about installation,
configuration, and operation of this equipment before you install, configure, operate, or maintain this product.
Users are required to familiarize themselves with installation and wiring instructions in addition to
requirements of all applicable codes, laws, and standards.
Activities including installation, adjustments, putting into service, use, assembly, disassembly, and
maintenance are required to be carried out by suitably trained personnel in accordance with applicable code of
practice.
If this equipment is used in a manner not specified by the manufacturer, the protection provided by the
equipment may be impaired.
In no event will Rockwell Automation, Inc. be responsible or liable for indirect or consequential damages
resulting from the use or application of this equipment.
The examples and diagrams in this manual are included solely for illustrative purposes. Because of the many
variables and requirements associated with any particular installation, Rockwell Automation, Inc. cannot
assume responsibility or liability for actual use based on the examples and diagrams.
No patent liability is assumed by Rockwell Automation, Inc. with respect to use of information, circuits,
equipment, or software described in this manual.
Reproduction of the contents of this manual, in whole or in part, without written permission of Rockwell
Automation, Inc., is prohibited.
Throughout this manual, when necessary, we use notes to make you aware of safety considerations.
Labels may also be on or inside the equipment to provide specific precautions.
WARNING: Identifies information about practices or circumstances that can cause an explosion in a hazardous environment,
which may lead to personal injury or death, property damage, or economic loss.
ATTENTION: Identifies information about practices or circumstances that can lead to personal injury or death, property
damage, or economic loss. Attentions help you identify a hazard, avoid a hazard, and recognize the consequence.
IMPORTANT
Identifies information that is critical for successful application and understanding of the product.
SHOCK HAZARD: Labels may be on or inside the equipment, for example, a drive or motor, to alert people that dangerous
voltage may be present.
BURN HAZARD: Labels may be on or inside the equipment, for example, a drive or motor, to alert people that surfaces may
reach dangerous temperatures.
ARC FLASH HAZARD: Labels may be on or inside the equipment, for example, a motor control center, to alert people to
potential Arc Flash. Arc Flash will cause severe injury or death. Wear proper Personal Protective Equipment (PPE). Follow ALL
Regulatory requirements for safe work practices and for Personal Protective Equipment (PPE).

Rockwell Automation Publication 42JT-UM001A-EN-P 5
Table of Contents
1.Product Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Product Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
Operation Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
2.Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
User Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Alignment Indication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Margin Curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Wiring. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
3.Teaching the 42JT in Standard IO (SIO) Mode. . . . . . . . . . . . . . . . 10
Teach Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Diffuse Teach Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Polarized Retroreflective Teach Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
Transmitted Beam Teach Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Light or Dark Operate Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Output Type Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Push Button Lock/Unlock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Remote Teach (RT). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
4.42JT VisiSight Sensor with IO-Link Overview . . . . . . . . . . . . . . . . 15
What is IO-Link? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Why IO-Link? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
How Does IO-Link Work: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
IO-Link Data Types. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
Accessing IO-Link Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
Start-up of the I/O System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
Assigning Device Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
Rockwell Automation Solution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
Premier Integration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
42JT IO-Link Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
5.Setting up the 42JT for IO-Link Mode. . . . . . . . . . . . . . . . . . . . . . . . 24
Example: Setting up the Hardware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
6.Creating a Project . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
AOP Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
7.Configuring IO-Link Master . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
8.Registering the 42JT IODD. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
9.Connecting the 42JT to the IO-Link Master . . . . . . . . . . . . . . . . . . 40
10.Exploring the 42JT IO-Link Parameters. . . . . . . . . . . . . . . . . . . . . 42
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42
IO-Link Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43
11.Teaching the 42JT on IO-Link . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
12.Setting up the Sensor with Studio 5000 . . . . . . . . . . . . . . . . . . . . 57
Sample Code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .57
Sample Routines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .60
Initial Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .64
To Perform a Static Teach . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .64
Precision Teach. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .65
Dynamic Teach . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .66
Read a 42JT VisiSight Parameter Using Explicit Messages. . . . . . . . . . . . . . . . . .67

6Rockwell Automation Publication 42JT-UM001A-EN-P
Table of Contents
Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .69
Checklist. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
Appendix A — Installing the Add-on Profile . . . . . . . . . . . . . . . . . . . . 71
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
Performing the Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
Appendix B — Device Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . .76
Identification Tab . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
Parameter Tab . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
Diagnosis Tab. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
Process Date . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
Appendix C — Message Structure and Configuration Examples.79
Configuring a Message Instruction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
Appendix D — Error Coes and Events. . . . . . . . . . . . . . . . . . . . . . . . . . . 87
Error Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
Events . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
Appendix E — Abbreviations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .89

Rockwell Automation Publication 42JT-UM001A-EN-P 1
Chapter 1
Product Overview
Product Description The 42JT VisiSight™ family offers a wide range of sensing modes and a teach push
button that simplifies sensitivity adjustment and offers light versus dark operate
output selection. The unique “Auto PNP/NPN” output continuously monitors
how the load is connected and automatically configures the output for proper
operation and output light-emitting diode (LED) to indicate correct output
status.
The embedded IO-Link communication interface enables the sensor to provide
more diagnostics information to help reduce downtime and increase
productivity.
Operation Modes The sensor can operate in two modes:
Standard IO (SIO) Mode: The sensor default-operation mode. The sensor
outputs and user interface behave as described in the installation instructions
included with the product. This mode of operation is active when the sensor is
connected to digital input devices such as a PLC inputs modules, distribution
boxes, and input terminal connections.
IO-Link Mode: This mode is automatically activated when the sensor is
connected to an IO-Link enabled master device. Upon entering this mode, the
green LED on the sensor starts blinking at a rate of one hertz to indicate that IO-
Link communication has been successfully established with the master. The
sensor transmits more parameter and diagnostic information that can be accessed
via the PLC process data. No user intervention is required to enable this
functionality within the sensor.
Features •Class 1 “Eye Safe” red laser beam (for small object and contrast detection)
and visible red LED models
•Unique “Auto PNP/NPN” output reduces the cost of inventory and
simplifies selection, installation, and maintenance (patent pending)
•IO-Link communications protocol helps minimize downtime and increase
productivity by using the same wiring as existing standard sensors.
•Teach push button for sensitivity and L.O./D.O. selection for ease of setup
•Excellent background suppression performance
•Alignment indication to aid in the installation of sensors with long range.

2Rockwell Automation Publication 42JT-UM001A-EN-P
Product Overview
•Industry-standard mounting holes (25.4 mm (1 in.) separation) plus dove-
tail mounting option
•Laser etched markings for durability
•IP69K high pressure/temperature washdown rating and ECOLAB
certified to withstand food industry chemicals that are used for cleaning
•IO-Link features
–Sensor Heartbeat™ feature helps to improve reliability operation by
indicating to the PLC if a sensor has lost connectivity due to failure or
faulty wiring.
–Margin Low Alarm helps minimize downtime by indicating when the
sensor is about to fail due to insufficient light being reflected.

Rockwell Automation Publication 42JT-UM001A-EN-P 3
Installation
Chapter 2
Installation
User Interface
LED Status
The Standard IO operation table provides LED status in the RUN mode during
operation. The sensor is always in RUN mode, except when being taught.
Standard IO Operation
IO-Link Operation
Alignment Indication For short range applications, the visible light beam of the sensor suffices as
alignment aid.
The alignment feature can be used for longer range applications. Alignment of
the sensor is indicated via change in intensity of the green LED in the Alignment
Mode, as follows:
1. Press and release the push button twice within three seconds. After three
seconds, the green LED turns OFF for 0.5 second indicating the sensor is in
the alignment mode.
Green
OFF Power is OFF
ON Power is ON
Flashing (6 Hz) Unstable light level (0.5 < margin < 2)
Flashing in (1.5 Hz) Output short circuit protection active
Yellow OFF Output de-energized
ON Output energized
Green OFF Power is OFF
Flashing (1 Hz) Power is ON
Yellow OFF Output de-energized
ON Output energized
Yellow LED Push button
Green LED

4Rockwell Automation Publication 42JT-UM001A-EN-P
Installation
2. Align sensor to the target to be detected. Intensity of green LED increases
with better alignment. Secure it in a position that yields the highest intensity
of the green LED. Press and release the button once to return to the RUN
mode, or the sensor automatically returns to RUN mode in two minutes.
Specifications
See Connection Types table.
ECOLAB on -P4 and -A2 models only
UL: -20…+50°C (-4…122°F)
UL: Class 2 source
Mounting Securely mount the sensor on a firm, stable surface, or support. An application,
which is subject to excessive vibration or shifting, can cause intermittent
operation. For installation convenience, Rockwell Automation® offers a wide
range of brackets for mounting (see the Accessories section for more details).
42JT-D2LAT1-42JT-D8LAT1-42JT-P2LAT1-42JT-P8LAT1-
42JT-E2EZB1- and
42JT-R9LAT1-
42JT-E8EZB1- and
42JT-R8LAT1-
Environmental
Certifications cULus and CE Marked for all applicable directives
Operating Environment IP67, IP69K, ECOLAB
Operating Temperature [C (F)] -20…+60° (-4…+140°)
Storage Temperature [C (F)] -20…+80° (-4…+179°)
Optical
Light Source Visible red 660 nm Class 1 laser 650 nm Visible red 660 nm Class 1 laser 650 nm Visible red 660 nm Class 1 laser 650 nm
Sensing Range 3…800 mm 
(0.12…31.5 in.)
1…250 mm 
(0.04…9.8 in.)
0.1…6 m 
(0.33…19.7 ft)
0.05…13 m 
(0.16…42.7 ft)
0…13 m 
(0…42.65 ft)
0.05…18 m 
(0…59.05 ft)
Adjustments Push button
Electrical
Voltage 10…30V DC
Current Consumption 30 mA maximum
Sensor Protection Reverse polarity, short circuit, overload
protection Reverse polarity, short circuit protection Reverse polarity, short circuit, overload
Outputs
Response Time 0.5 ms maximum 0.33 ms maximum 0.5 ms, maximum 0.25 ms, maximum 0.5 ms, maximum 0.25 ms, maximum
Output Type Auto NPN or PNP Auto PNP/NPN or IO-Link Auto PNP/NPN or IO-Link
Output Function Selectable light or dark operate
Output Current 100 mA maximum
Output Leakage Current 10 μA maximum
Mechanical
Housing Material ABS
Lens Material PMMA
Cover Material PMMA
Optional Accessories Mounting brackets, cordsets

Rockwell Automation Publication 42JT-UM001A-EN-P 5
Installation
Dimensions The following illustration shows the relevant device dimensions [mm(in.)]:
Margin Curves Typical Response Curves
Standard Diffuse [800 mm (31.49 in.)]
12
(0.47)
M8 x 1
34
(1.34)
22.9
(0.90)
25.4
(1.0)
2.6
(0.10)
20
(0.79)
12
(0.47)
34
(1.34)
22.9
(0.90)
25.4
(1.0)
2.6
(0.10)
20
(0.79)
2.8
(0.11)
1000
100
1
10
10
(0.4)
800
(31.5)
600
(23.6)
400
(15.75)
200
(7.87)
Distance [mm (in.)]
Excess Gain

6Rockwell Automation Publication 42JT-UM001A-EN-P
Installation
Spot Size [800 mm (31.49 in.)]
Laser Diffuse [250 mm (9.84 in.)]
Adonis: what is this referring to?
0
0
10
20
30
40
50
60
70
horizontal = verticalhorizontal = verticalhorizontal = verticalhorizontal = verticalhorizontal = verticalhorizontal = verticalhorizontal = verticalhorizontal = verticalhorizontal = verticalhorizontal = verticalhorizontal = verticalhorizontal = verticalhorizontal = verticalhorizontal = vertical
800
(31.5)
600
(23.6)
400
(15.75)
200
(7.87)
Distance [mm (in.)]
Size [mm] 
0
0
5
10
15
20
25
30
Distance [mm]
Excess Gain
200
(7.87)
150
(5.91)
100
(3.94)
50
(1.96)
250
(9.84)
Distance [mm (in.)]
Excess Gain

Rockwell Automation Publication 42JT-UM001A-EN-P 7
Installation
Laser Spot Size [250 mm (9.84 in.)])
Red Polarized Retroreflective [6 m (19.68 ft)]
Adonis: what is this referring to?
0
0.0
0.5
1.0
1.5
2.0
horizontal = vertical
200
(7.87)
150
(5.91)
100
(3.94)
50
(1.96) 250 (9.84)
Distance [mm (in.)]
Size [mm] 
0.1 2
(6.6)
1
(3.3)
4
(13.1)
7
(23)
5
(16.4)
6
(19.7)
3
(9.9)
10
1
100
3
1
3
2
1
2
92-109
92-108
92-125
Distance [m (ft)]
Excess Gain

8Rockwell Automation Publication 42JT-UM001A-EN-P
Installation
Polarized Retroreflective — Spot Size
Laser Polarized Retroreflective — Margin Curve [13 m (42.65 ft)]
Laser Polarized Retroreflective — Spot Size
01
(3.3)
2
(6.6)
3
(9.9)
4
(13.1)
5
(16.4)
6
(19.7)
7
(23)
0
100
200
300
400
500
600
Distance [m (ft)]
Size [mm]
03
(9.9)
6
(19.7)
9
(29.5)
12
(39.4)
15
(49.2)
0
10
20
30
92-118
Distance [m (ft)]
Excess Gain
05
(16.4)
10
(32.8)
15
(49.2)
0
5
10
15
20
Distance [m (ft)]
Size [mm]

Rockwell Automation Publication 42JT-UM001A-EN-P 9
Installation
Red Transmitted Beam [13 m (42.65 ft)]
Red Transmitted Beam—Spot Size
Wiring Micro (M12) Male QD on Pigtail and Integral Pico (M8) Male QD
1000
100
10
10 2.5 5 7.5 10 12.5 15
Distance [m (ft)]
Excess Gain
3
(9.9)
6
(19.7)
9
(29.5)
12
(39.4)
15
(49.2)
0
0
200
400
600
800
1000
1200
horizontal = vertical
Distance [m (ft)]
Size [mm]
4
3
1
2
3
2
1
4
M12 Male M8 Male

10 Rockwell Automation Publication 42JT-UM001A-EN-P
Installation
Output Wiring
Transmitted Beam Receiver
Transmitted Beam Emitter
Normal operation: no connection. (Disabled in IO-Link operation.)
Remote teach: connect to +V. See the Remote Teach section.
Push-button lock: connect to -V. See the Push-Button Lock/Unlock section.
For Normal operation, white wire (pin two) and black wire (pin four) needs no connection. To disable light source,
connect white wire (pin two) to +V or disable light source via IO-Link.
Brown (1)
Black (4)
White (2)
Blue (3)
+V
Output Auto NPN/PNP or IO-Link
Remote Teach/Lock 
-V
+
-
Brown (1)
White (2)
Blue (3)
Test
Black (4) IO-Link
V
V

Rockwell Automation Publication 42JT-UM001A-EN-P 11
Teaching the 42JT in Standard IO (SIO) Mode
Chapter 3
Teaching the 42JT in Standard 
IO (SIO) Mode
Teach Overview The 42JT VisiSight is configured using the push button or Remote Teach or IO-
Link and the LED indicators on the sensor. Five features can be configured:
•• Static Teach: Standard or precision teach for sensitivity/ sensing range
•• Dynamic Teach (running process)
•• Light operate (L.O.) or dark operate (D.O.) output
•• Auto PNP/NPN, dedicated NPN, or dedicated PNP
•• Push-button lock/unlock
The sensor output is disabled during Teach.
Teach Sensitivity/Sensing Range
The default setting is the maximum sensitivity/range.
Diffuse Teach Procedure Static Teach: To teach the sensitivity/sensing range is a two-step process: teach
“target” (first condition) and teach “no target” (second condition). To switch the
threshold for output ON versus OFF, set in between the two conditions.
Standard Teach
1. To teach the “target” (first condition):
Place the target at the desired maximum distance. Press and hold the
button for three seconds until the yellow LED starts flashing. Release
the button. The first condition has now been taught.
t < 3 s
Target

12 Rockwell Automation Publication 42JT-UM001A-EN-P
Teaching the 42JT in Standard IO (SIO) Mode
2. Teach “no target” (second condition):
Precision Teach: If there is nothing in the field of view in step two, the sensing
range is set farther than the target to maximize excess gain and improve detection
reliability. For a more precise setting with less excess gain, do not remove the
target in step two (for example, the target is present for both step one and step
two). Also use precision teach for contrast applications.
Restore to factory default setting of maximum range: Perform steps one and
two with “no target” in the sensor field of view.
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 sensitivity is automatically
taught in the next 30 seconds provided the sensor sees two cycles of “target” and
“no target.” The threshold for the switching output ON versus OFF is set in
between the two conditions.
Polarized Retroreflective
Teach Procedure
Static Teach: To teach the sensitivity/sensing range is a two-step process: teach
the reflector (first condition) and teach the “target” (second condition).
Standard Teach
1. To teach the reflector (first condition):
Remove the target. 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.
The sensor can also be taught by teaching “no target” as the first condition and
“target” as the second condition.
t < 0.5 s
IMPORTANT
Align the sensor to the reflector. Press and hold the button for three
seconds until the yellow LED starts flashing. Release the button. The
first condition has been taught.
t < 3 s
Reector

Rockwell Automation Publication 42JT-UM001A-EN-P 13
Teaching the 42JT in Standard IO (SIO) Mode
2. Teach “target” (second condition):
Restore to factory default setting of maximum range: Perform steps 1 and 2 with
“no target” in the sensor field of view and no emitter.
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 sensitivity is automatically
taught in the next 30 seconds provide
Transmitted Beam Teach
Procedure
Static Teach: To teach the receiver facing the emitter (first condition) and teach
the “target” (second condition).
Standard Teach
1. To teach the reflector facing the emitter (first condition):
2. Teach “target” (second condition):
Restore to factory default setting of maximum range: Perform steps one and two
with “no target” in the sensor field of view and no emitter.
Insert the target between the sensor and the reflector. 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.
t < 0.5 s
Target
Reector
No teaching is needed for most applications. The teaching is only necessary for
targets that are not fully opaque and the sensor might see through the target (thus
not detect the target) if set at maximum sensitivity.
Align the sensor to the emitter. Press and hold the button for three
seconds until the yellow LED starts flashing. Release the button. The
first condition has been taught.
Insert the target between the emitter and the receiver. 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.
IMPORTANT
t > 3 s
Receiver
t < 0.5 s
Target

14 Rockwell Automation Publication 42JT-UM001A-EN-P
Teaching the 42JT in Standard IO (SIO) Mode
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 sensitivity is automatically
taught in the next 30 seconds provided the sensor sees two cycles of “target” and
“no target.”
Light or Dark Operate
Selection
The default setting of the output is light operate (L.O.) for diffuse and D.O. for
polarized retroreflective and transmitted beam sensors
The D.O. setting means that output turns ON when the light between the
emitter and the receiver is blocked. If the application requires the output to turn
OFF when the target is blocking the light between the emitter and receiver, the
setting can be changed to light operate (L.O.).
1. To access the teach output mode setting:
2. To change the sensor output mode setting:
Output Type Selection (Auto
PNP or NPN, Dedicated NPN, 
Dedicated PNP)
The default setting is Auto PNP or NPN, which means that the sensor monitors
the load connection and automatically configures the output for proper
operation, for example, PNP or NPN. If no load is connected, the sensor defaults
to PNP.
The following applications are covered with dedicated PNP or dedicated NPN
selection:
•Parallel wiring of multiple sensor outputs: select dedicated PNP or
dedicated NPN setting, as needed.
•NPN configuration to another power supply or load enabling contact:
select dedicated NPN.
Press and hold the button for six seconds until the green LED starts
flashing. Release the button. The yellow LED indicates the current
setting: 

L.O.: Yellow LED ON
D.O.: Yellow LED OFF
Press and release the button within ten seconds to toggle from L.O. to
D.O., the selection indicated by the yellow LED.
The sensor retains the setting per the last button depression and
returns to the RUN mode ten seconds after the last button is depressed.
t > 6 s
t < 0.5 s

Rockwell Automation Publication 42JT-UM001A-EN-P 15
Teaching the 42JT in Standard IO (SIO) Mode
Selection can be made as follows:
1. To access output type: Press and hold the push button for 12 seconds (until
both LEDs start flashing synchronously). At the release of the button, the
current setting output type indicates the slow flashing of the LED (or LEDs)
as follows:
•Auto PNP/NPN: both LEDs flashing
•Dedicated NPN: green LED flashing
•Dedicated PNP: yellow LED flashing
2. To change output type: Press and release the push button within ten seconds
to select desired type. Each press of the button will cycle to the next output
setting. The LEDs indicate the type that is selected. The sensor retains the setting
per the last button depression and returns to the RUN mode ten seconds after
the last button is pressed.
Push Button Lock/Unlock The push button or remote teach (RT) can be used to prevent unauthorized
users from changing teach settings.
To lock the push button: Press and release the button three times within three
seconds. Both LEDs flash synchronously for three seconds, which indicates that
the push button is now locked.
To unlock the push button: Press and release the button three times within
three seconds. Both LEDs flash asynchronously for three seconds to indicate that
the push button is now unlocked.
Permanent lock: The push button can be permanently locked by connecting
the white wire (pin two) to –V.
Remote Teach (RT) The sensor can be taught remotely via the white wire (pin two). Connection to
+V acts the same as the button being pressed and no connection is the same as
the button not being pressed. The sensor can be taught by following the same
teach/timing sequence as used in the push button teach. For example, connect to
the +V for more than three seconds to teach the “target,” disconnect from the
+V; remove the target and connect to the +V for less than one second to teach
“no target.” All push-button functions can also be implemented via RT.

16 Rockwell Automation Publication 42JT-UM001A-EN-P
42JT VisiSight Sensor with IO-Link Overview
Chapter 4
42JT VisiSight Sensor with 
IO-Link Overview
What Is IO-Link? The IO-Link technology is an open point-to-point communication standard and
was launched as (IS) IEC 61131-9. IO-Link is now the first globally standardized
technology for sensor and actuator communication with a field bus system. This
technology provides benefits to both OEMs and End Users.
IO-Link provides communications-capable sensors to the control level by a cost-
effective point-to-point connection. IO-Link provides a point-to-point link
between the I/O module and sensor that is used for transferring detailed
diagnostics, device identity information, process data, and parameterization.
IO-Link communication is based on a master-slave structure in which the master
controls the interface access to the sensor. The option of using the intelligence
that is integrated into the sensor provides the user with new commissioning
methods. Benefits range from reduced installation time during startup to
increased diagnostics over the lifetime of the machine. Benefits of IO-Link
technology include:
•Reduced inventory and operating costs
•Increased uptime/productivity
•Simplified design, installation, setup, and maintenance
•Enhanced flexibility and scalability
•Detailed diagnostic information for preventative maintenance
Why IO-Link? IO-Link Offers a Full Range of Advanced Features and Functions
Seamless Integration
•Forward and backward compatible, sensor catalog numbers remain the
same
•No special cables required
•Connectivity options remain the same
•Access IO-Link functionality by simply connecting an IO-Link enabled
device to an IO-Link master
•Analog devices no longer require a dedicated input card