Page 118 of 126
Proton Products SL mini and SLR mini Series Speed and Length Gauges Instruction Manual - issue 1s
Connections to the SL / SLR / SL mini / SLR mini gauge
SL / SLR / SL mini / SLR mini gauges provide three user configurable logic inputs to connect to light
barriers LB1 and LB2 and also to a reset pulse input from other production control equipment for
resetting the length measurement. Access to these inputs is either via:
1. The DB25 INTERFACE socket on the gauge.
2. The screw terminal board in an optional PSU-BOB-SL combination power supply and
breakout box (for SL and SLR gauges) or a PSU-BOB-SL-mini (for SL mini and SLR mini
gauges).
Pin / Screw Designation Designation full name
Suggested application
3
LIN 1
Logic input 1
LB1
–
Length hold mode
4
LIN 2
Logic input 2
LB2
–
Length hold mode
5
LIN 3
Logic input 3
Reset length measurement pulse (no
shorter than 1ms in duration)
15
DGND
Digital ground
Ground reference for LB1 and LB2
Power for +24VDC light barriers may be derived from the +24VDC power rail of the gauge:
Pin / Screw Designation Designation name
Suggested application
24
REG. GND
Power rail ground
SL /
SLR
User must externally connect
this pin to DGND (pin 15) if used
to power +24VDC light barriers
SL mini
/ SLR
mini
Already internally connected
inside the SL mini / SLR mini to
DGND (pin 15).
25
+24V
+24VDC power rail
May be used to power +24VDC light
barriers.
DB25 INTERFACE Socket Logic Input Pin Designations
Connector type: DB25 Female Socket
PSU-BOB-SL Screw Terminal Designations (for SL and SLR gauges only):
PSU-BOB-SL screw terminal numbers correspond directly to DB25 interface socket pin numbers.
In addition to screw terminal 15, an additional Digital Ground (DGND) terminal is provided on the
PSU-BOB-SL screw terminal board.
Pin 24: REG. GND: Power supply ground
Pin 25: +24V: +24VDC Power supply
