SICK HTB18, Operating Instructions Manual

Page: 20 / 231

7.4 Additional functions
Alarm / Health output
The sensor (HTB18(L)) features a pre-failure notification output (“Q2” in connection
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 is conta‐
minated, 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 (HTB18(L)) 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
Time types: HTB18(L) 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.
Timer stages can be set from 0 to 2 seconds.
8 Troubleshooting
The Troubleshooting table indicates measures to be taken if the sensor stops working.
Table 10: Troubleshooting
LED indicator/fault pattern Cause Measures
Yellow LED does not light up
even though the light beam is
aligned to the object and the
object is within the set sensing
range No voltage or voltage below
the limit values Check the power supply,
check all electrical connec‐
tions (cables and plug connec‐
tions)
Voltage interruptions Ensure there is a stable power
supply without interruptions
Sensor is faulty If the power supply is OK,
replace the sensor
Green LED flashes IO-Link communication -
Switching outputs not accord‐
ing to graphic C IO-Link communication -
Switching outputs not accord‐
ing to graphic C Parameter settings made
manually, which deviate from
the standard Initiate a factory reset. The
switching outputs are reset to
factory settings.
Yellow LED flashes; if Health is
present then take note of the
corresponding output signal; if
Alarm is present then take note
of the corresponding output
signal Sensor is still ready for oper‐
ation, but the operating con‐
ditions are not ideal/addition‐
ally with health output: power
supply interrupted Check the operating condi‐
tions: Fully align the beam
of light (light spot) with the
object / Clean the optical sur‐
faces / Check sensing range
and adjust if necessary, see
figures in
chapter 7.2 / With
health output: Check the volt‐
age supply, check all electrical
connections (cables and plug
connections).
7
COMMISSIONING
20
8017850.1A15 / 2020-12-14 | SICK
Subject to change without notice