Laser beta lasermike LS8000-3 - Manual (Page 43)

LaserSpeed 8000-3 Instruction Handbook
Interfacing with the LS8000-3
Part No. 93463 / Drawing No. 0921-01561 Page 43 of 221 Revision A (Sep 2007)
Material Present Input (Pin 10)
This is an optically isolated input that can be used to externally control the
Material Present feature of the LS8000-3. The input requires a voltage high (5
to 24V) to activate. The input level should be the same as the voltage
connected to the User V
IN
input (Pin 20) or 5V if there is nothing connected to
the User V
IN
input.
Optically Isolated Input Schematic
The LS8000-3 can internally sense Material Present, but there are situations
where it is advantageous to determine this externally. This input can also be
used to start and stop length measurements. This input is typically used in the
following situations:
Continuous Processes such as Cold Mills, where there is always metal
in front of the gauge. The input can be used both to start/stop length
measurements, and to prevent the LS8000-3 from sending speed
data/pulses to the PLC while the line is stopped. The LS8000-3 can be
configured to clear the measured velocity to 0 and hold the pulse
outputs when the Material Present input is in the "Material Not Present"
state.
Discrete Part Length applications can take advantage of this input to
increase the precision of length measurements. Two material
detection gauges (such as optical make/break gauges) can be
mounted on either side of the LS8000-3
This input is functional only when the Material Present Input Mode has been
set to External Mode. Activating this input causes a new measurement to
begin. This resets the current length, and resumes counting at 0.
Deactivating this input causes the current measurement to end, which causes
the length to hold at the current value. If in Final Length Mode, the final length
will be output on the RS-232/RS-422/Ethernet port. The functionality of this
input varies with the Material Present Input Mode. The Material Present Input
Mode is configurable through LaserTrak, or by using the “S” serial command.