Rockwell Automation 42JT-xxx VisiSight Photoelectric Background Suppression Sensors - Manual (Page 2)

2
Mounting the Sensor
Securely mount the sensor on a firm, stable surface or support. An
application subject to excessive vibration or shifting may cause
intermittent operation. For installation convenience, Rockwell
Automation offers a wide range of mounting brackets (see
Accessories section for more detail).
Note: Due to the detection method, targets travelling
horizontally to the sensor’s optics are detected. Targets
travelling vertically may not be accurately detected. For
reliable background suppression, a minimum separation
distance is recommended between the target and the
background; however this can vary depending on the
application. Refer to the Typical Response Curves section.
VisiSight™ Configuration
The 42JT VisiSight is configured using the push button or Remote
Teach or via IO-Link, and the LED indicators on the sensor. Four
features can be configured:
• Standard or precision teach for sensitivity/sensing range
• Light operate (LO) or dark operate (DO) 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.
Teaching the sensitivity/sensing range is a two-step process:
teach the background (first condition) and teach “target” (second
condition). Switching threshold for output ON vs. OFF is set in
between the two conditions.
Standard Teach:
1. To teach the background (first condition):
2. Teach “target” (second condition):
Align the sensor to the background. Press and
hold button for three seconds until yellow LED
starts flashing. Release the button. The first
condition has now been taught.
In the case of multiple reflectivity targets,
choose the darkest/least reflective target
placed in its farthest position for set up.
Target
t > 3 s
Background
IMPORTANT
If there’s no background surface in the field of view in Step 1, the
switching threshold will be set between the distance to the target
and the maximum sensing range. The sensor can also be taught
by teaching the target as the first condition and background
as the second condition.
Precision Teach: For a more precise setting with a smaller
hysteresis, teach the sensor to the target in step 1 and keep the
target present in step 2).
Restore to factory default setting of maximum range: Perform
steps 1 and 2 with “no target” in the sensor’s field of view and
nothing in the background.
Teach Light Operate (L.O.) or Dark Operate (D.O.)
The default setting of the output is Light Operate (L.O.)
L.O. setting means that output turns ON when the target is
detected. If the application requires the output to turn OFF when
the target is detected, the setting may be changed to Dark
Operate (D.O.).
1. To access the teach output mode setting:
2. To change the sensor output mode setting:
Output Type Selection: Auto PNP/NPN, Dedicated NPN,
Dedicated PNP
The default setting is Auto PNP/NPN. The sensor monitors the
load connection and automatically configures for proper
operation, i.e. 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:
a. Parallel wiring of multiple sensor outputs: select dedicated
PNP or dedicated NPN setting, as needed.
Insert the target between the sensor and the
background. 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.
Press and hold button for six seconds until the
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
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 < 0.5 s
Target
Background
t > 6 s
t < 0.5 s