Laser beta lasermike LS8000-3 - Manual (Page 45)

LaserSpeed 8000-3 Instruction Handbook
Interfacing with the LS8000-3
Part No. 93463 / Drawing No. 0921-01561 Page 45 of 221 Revision A (Sep 2007)
Example 1:
You are using an external make/break optical switch to begin and end the
measurement. The optical gauge has a smaller spot size than the LS8000-3,
so it will more exactly detect the edge of the product. When the part enters the
measurement area the switch outputs a Low (0V) signal, and when there is a
part in the measurement area, the switch outputs a High (24V) signal. So,
when the part enters the measurement area, a Low High transition occurs,
and when the part exits the measurement area, a High Low transition occurs.
This configuration requires that you set the Material Present Input Mode to 2
(External/Active High). When the part enters the measurement area
(Low High) a measurement begins, and when the part exits the
measurement area (High Low) the measurement ends. If the LS8000-3 is in
Final Length Mode, the elapsed length will be transmitted over the serial port
when the part exits the measurement area.
Optical Make/Break
Sensor Fibers
Part to be measured
Line movement
Material Present Input
Part Breaks Sensor Beam
Optical Make/Break
Sensor Fibers
Part to be measured
Line movement
Material Present Input
Part Clears Sensor Beam