Image: G
5
Additional functions
Alarm output: The sensor (HL18) features a pre-failure notification output (“Q2” in con‐
nection diagram [B], if the
alarm
option is selected), which issues a notification if the
signal strength of the light being received is not sufficient. Possible causes: Sensor or
reflector is contaminated, sensor is out of alignment. In the good state: LOW (U
V
< V); if
excessively contaminated: HIGH (>+U
V
- V). The LED indicator flashes in this case.
Health output: The sensor (HL18) features a health status notification output ("Q2" in
connection diagram [B], if the health option is selected), which issues a notification if
the signal strength of the light being received is sufficient. Possible causes, if the signal
strength is not sufficient: Sensors are contaminated, sensors are out of alignment, or
cable is damaged. In the good state: HIGH (>+U
V
- V); if excessively contaminated or in
the event of cable interruption: LOW (U
V
< V). The LED indicator flashes in this case.
Time types: HL18 with optional On-delay or Off-Delay adjustment: t0 = no time delay, t1
= time delay when object is detected, t2 = time delay when no object is detected. The
time setting can be selected using the potentiometer according to A.
dark switching
light switching
2
1
t = 1
1
2
t = 2
Timer stages can be set from 0 to 2 seconds.
Light/dark switch: The sensor is in light switching mode when optional light/dark poten‐
tiometer is rotated to the “L” position. The sensor is in dark switching mode when optio‐
nal light/dark potentiometer is rotated to the “D” position. The green power supply LED
will flash once when the mode is changed.
6
Fault diagnosis
Table indicates which measures are to be taken if the sensor stops working.
4
4
8017290 | SICK
Subject to change without notice
