Null Offset (nu)
NOTE: Always perform the null function when installing or removing optional lens or changing LED
intensities.
The null feature allows the sensor to be “zeroed”. For example, when the target is not in view and there is a
background that causes a reading above zero, the null feature allows this level to be subtracted out, allowing
the display to indicate 00. Press and hold the
T/+
key to null the sensor. The display will flash the value that
is being subtracted. To set the sensor back to a true zero, aim the sensor away from any target and repeat the
null process.
Gain Adjustment (r)
To change the gain setting press and release the
T/+
key to toggle through the selections. R1 indicates a gain
of 1; R2 indicates a gain of 10. The selected gain is stored in memory and is retained when power is
removed. After changing the gain setting always perform the null offset (
nu
) to re-zero the sensor.
Teach Function
The teach function allows the user to set the threshold by placing a representative target located at the
required distance and allowing the sensor to determine the optimum LED intensity and setting of the
threshold level.
1.
Press and hold the
T/+
key for several seconds until the yellow led flashes.
2.
Place the target at the appropriate distance from the sensor and press the
P/-
key. The display will
flash 3 times and the sensor will adjust the LED intensity level to achieve reasonable signal level.
The green LED will flash.
3.
Remove the target and press the
P/-
key. The display will flash 3 times.
4.
Exit the teach function and return to the normal operating mode by Pressing the
T/+
key for several
seconds.
When in the teach mode the LED flashes constantly, yellow, green or red. Yellow indicates that the sensor
is ready to be taught the Detect level. Green indicates that the sensor is ready to be taught the Undetect
level. Red indicates that the last attempt to teach resulted in an error. If the error occurred during the
teaching of the Detect level then the signal intensity was less than 01. If the error occurred during the
teaching of the Undetect level, then the signal intensity was greater than or equal to the threshold level. In
either case, repeat the teach function to properly set the levels.
Input/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 intensity level exceeds the threshold, in high-speed applications it may be useful to use
the Extend Output Pulse feature to lengthen the signal duration to meet acquisition requirements of the PLC.
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.
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