CNTR Contrast Sensor
Operation Manual
The discrete output must not be connected to outputs from other
sensors (i.e. outputs from multiple sensors must not be connected
in parallel). Parallel connections may damage sensor output circuitry.
Sensor is not suitable for wash down or hazardous environments; a
separate enclosure with the appropriate ratings is recommended for
these applications.
IMPORTANT:
This product is an accessory or part of a system. Always read and
follow the manufacturer’s instructions for the equipment before connecting this product. Comply with all applicable codes and safety regulations. Failure to do so may result in damage, injury or death.
SHIMPO INSTRUMENTS
The CNTR sensor combines small spot size and fast response
to achieve high-speed contrast detection capable of detecting a
wide variety of marks and objects. The CNTR effectively detects
contrast differences between many colors on various surfaces
over a range of 50 grayscale levels. The modulated white light
source in the CNTR is focused to a 2.5 to 3 mm spot and directed toward a target. The diffused light returning to the sensor is
measured. When the level is equal to or exceeds the threshold
the discrete output changes state. Due to the fast response of
the sensor, it is suitable for use in high-speed applications. The
sensor provides a discrete output that automatically configures to
NPN and PNP. A PLC or a computer can be used to monitor the
status of the discrete output signal.
LEARNING MODE
Two keys are provided, MARK and BKGD, which are used to set
the sensor’s detection level. The sensor output will activate when
the MARK is detected. The mark may be lighter or darker than the
background.
To Set the Sensor:
1. Place the MARK or BKGD in the sensor’s light spot and press
the appropriate key. Flashing yellow LED indicates proceed with
MARK setting, flashing green LED indicates proceed with BKGD
setting.
2. Place the other, MARK or BKGD in the sensor’s light spot and
press the appropriate key. Flashing yellow/green LED indicates
insufficient contrast error. Repeat from step 1.
SPECIFICATIONS
White Light Source: Broad spectrum LED,
min.100,000 hours
Sensing Distance: 28 mm
Spot Size (dia.): 3 mm
Depth of Field: +/-3 mm from focal point (approx. 28mm)
Response Time: 25uS
Switching Frequency: 40kHz
LED Intensity: 3 levels
Gray-Scale: 0 to 50
Controls: MARK and BKGD keys
Digital Output: Auto-Detect PNP / NPN
Analog Output: 0 to 5V (20 mV resolution)
Power Indicator: Green LED
Detect Indicator: Yellow LED
Programming Indicator: Yellow/green LED
Data Retention: EEPROM non—volatile memory
Dimensions: 2.0”(51mm) x 2.4”(61 mm) x 1.0”(25 mm)
Weight: 0.21 lbs. (95 g)
Supply Voltage: 10 to 24 VDC
Operating Current: 60 mA
Short Circuit Protection: Discrete output
Overload/Reverse Polarity Protection: Supply voltage
Operating Temperature: -20°C to 55°C
Storage Temperature: -20°C to 70°C
Housing: Plastic
Mechanical Protection: IP65
Connector: M12, 4-pin
Warranty: 2 year
3. Verify that the Yellow led indicates the presence of the mark.
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TARGETS WITH MULTIPLE COLORS
MARK is lighter than the background:
Program the MARK (for example, white), then the next
brightest, closest gray scale color that is printed as the
background (for example, yellow). The threshold would
be set between the white and the yellow color, therefore
should only trigger when the white is present.
MARK is darker than the background:
Program the MARK on the dark mark (for example, black)
and program the BKGD using the next closest gray scale
color (for example, brown) as the background and the
threshold will be set between these two colors.
Analog Output
The analog output is 0-5V with 20mV resolution (8-bit). Any standard analog input channel typically available on a PLC may monitor this output. The analog output signal is useful in applications
where simply triggering on the threshold is insufficient. For example, constant real-time monitoring of intensity in process allows
minor fluctuations or trends to be detected permitting corrective
action to be taken. The analog output response time is slower
than the discrete output response time and should be evaluated
per the requirements of each application.
M12 CONNECTIONS
INSTALLATION
Install the sensor using included accessory bracket LMS-BRKT or
suitable alternative bracket. Position the sensor at approximately
28 mm from the target object (measured from the sensor lens
surface). Normally the sensor may be positioned on a 15-20° angle to prevent interference from glossy surfaces. When using the
sensor to detect the glossy characteristic of the target, position
the sensor perpendicular to the target. Connect cable, LMS-CBL,
to power and outputs as required. Do not use other cable without
verifying connections and wire colors or damage to the sensor
may occur.
CONTROLS
Output LED
During normal operation the yellow LED indicates MARK and the
green LED indicates BACKGROUND. Yellow/green LED indicates
MARK or BKGD readings are being taken.
MARK Key
Sets mark level. After MARK is measured the LED may flash green
indicating that BACKGROUND measurement is required.
BKGD Key
Sets background level. After BACKGROUND is measured the LED
may flash yellow indicating that MARK measurement is required.
OUTPUT SIGNALS
Discrete Output
The discrete output is a PNP/NPN configuration allowing the user
to provide a load on this output that is either pulled high to VDC
or low to ground. The sensor monitors this level and automatically
determines whether to operate the PNP/NPN driver. This output is
typically connected to a PLC. The output remains active as long
as the mark is recognized as indicated by the yellow LED on the
sensor.
M12
Connector
Wire Color Description
Pin 1 Brown Power 10 to 24 VDC
Pin 2 White Analog Output
Pin 3 Blue Ground
Pin 4 Black Discrete Output,
DIMENSIONAL DETAILS
PNP/NPN
CAUTION: The discrete output must not be connected to outputs
from other sensors (i.e. outputs from multiple sensors must not be
connected in parallel). Parallel connections may damage sensor
output circuitry.
Find Quality Products Online at: sales@GlobalTestSupply.com
www.GlobalTestSupply.com
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