Table 18: Diagnostic classes and display behavior
Diagnostic class LED
About 1 Hz
Warning 2 Hz
Error 8 Hz
The states are represented as follows:
NOTE
All messages are relevant only to the recipient, with the exception of Test input enable,
Power on and Hardware error.
Table 19: LED display depending on device status
Message Details Class Yellow LED Green LED
Power on - About Not relevant On
Presence / no pres‐
ence
Independent of the pin configu‐
ration
About Off ≥ 1
beam inter‐
rupted
On = no
beam inter‐
rupted
On
Busy Device startup, Teach-in, Fac‐
tory reset, Reconfiguration cross
beam, IO-Link data storage
download
About 1 Hz; 50%
duty
On
Find me In the FindMe function, both
LEDs on the receiver flash.
About 1 Hz; 50%
duty
1 Hz; 50%
duty
IO-Link communica‐
tion
- About Not relevant 1 Hz; 90%
on; 10% off
Test input enable If a HIGH signal is applied to
sender pin 2, the sender LEDs
are deactivated (sender only).
About 1 Hz; 50%
duty
On
Quality of run (QoR)
alarm warning
LED only flashes if no object is
in the beam path
Warn‐
ing
2 Hz; 50%
duty
On
Temperature or oper‐
ating hours alarm
- Warn‐
ing
2 Hz; 50%
duty
On
Alignment aid If alignment aid is activated via
index 69 or SOPAS.
Warn‐
ing
2 Hz; 50%
duty
On
Teach-in error ≤ 5 seconds active. According
to a power cycle, a Teach-in error
becomes a Teach-in necessary
Error 8 Hz; 50%
duty
On
Short circuit error - Error 8 Hz; 50%
duty
On
Sync error If first and last beam interrupted
at the same time
Error 8 Hz; 50%
duty
On
Hardware error - Error Off Off
8.4 Sync error
To ensure reliable detection with the specified resolution, only one beam at a time is
active on the light grid. The beams are clocked through in the µs range.
To ensure that the sender beam and the receiver beam adjacent on the same plane are
always active, the beams must be synchronized with each other.
DIAGNOSTICS AND TROUBLESHOOTING 8
8026014/2021-06-10 | SICK O P E R A T I N G I N S T R U C T I O N S | SLG-2
47
Subject to change without notice
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