LED/fault pattern Cause Measures
Green LED does not light up or
flickers
Voltage interruptions Check the power supply,
check all electrical connec‐
tions (cables and plug connec‐
tions)
Yellow LED lights up, no object
in the path of the beam
Distance between the sensor
and the background is too
short
Reduce the sensing range
Object is in the path of the
beam, yellow LED does not
light up
Distance between the sensor
and the object is too long or
sensing range is set too short
Increase the sensing range
Object is in the beam path. Yel‐
low LED does not light up or
flickers.
Depolarizing property of the
object surface (e.g., tape),
reflection
Check operating mode, config‐
uration and operating condi‐
tions.
Yellow LED flashes Distance between sensor and
object is too long / Light spot
is not correctly aligned with
the object.
Check sensing range / Check
alignment
Teach-in has displayed errors
on 3 consecutive attempts
Sensor mounting unstable Check assembly and settings
Green LED does not light up Sensor is faulty If the power supply is OK,
replace the sensor
A return to the factory settings is possible at any time via the Return to Factory Settings button
.
7.1 Troubleshooting integrated IO-Link devices
Notes on malfunctions can be found in the service data.
Details of the available service data can be found in the detailed IO-Link description:
Technical Information: Photoelectric sensors, SICK Smart Sensors / IO-Link.
8 Sensor replacement/data storage
All IO-Link devices have a backup and restore functionality - Data Storage (DS). The
IO-Link Data Storage function can be used to save previous parameters and transmit
them to the replacement device.
The prerequisite for this is connection of the device to an IO-Link Master, and activation
of the storage function in the IO-Link Master.
Details on sensor replacement can be found in the detailed IO-Link description: Techni‐
cal Information: Photoelectric sensors, SICK Smart Sensors / IO-Link.
9 Disposal
The sensor must be disposed of in line with applicable country-specific regulations.
When disposing of them, you should try to recycle them (especially the precious met‐
als).
OPERATING INSTRUCTIONS
9382969/2024-02-23 | SICK O P E R A T I N G I N S T R U C T I O N S | WTM10L
61
Subject to change without notice
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