Laser LS8000-3 manual Material Present Input Pin, Optically Isolated Input Schematic

LaserSpeed 8000-3 Instruction Handbook

Interfacing with the LS8000-3

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 VIN input (Pin 20) or 5V if there is nothing connected to the User VIN 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.

Part No. 93463 / Drawing No. 0921-01561 Page 43 of 221 Revision A (Sep 2007)