Signal Quality - Balluff BOS R254K-UUI-RE10-S4 Konfiguration

BOS R254K-UUI-RE10-S4
Photoelectric Sensors
4
Primary Device Functions (continued)
4.8

Signal Quality

4.8.1 Description
The signal quality is specified in percent steps as a value
between 0 and 100 %. If the signal quality cannot be
provided, a replacement value of 0xFF (255) is output. The
threshold value for the monitoring function can be set and
is used to define two states of the signal quality. The signal
quality is considered to be good at or above the threshold
value; the signal quality is considered to be bad below the
threshold value. A state change from good to bad signal
quality triggers the Low signal quality level IO-Link event.
The output of the current signal quality can provide
support both when setting up as well as during predictive
maintenance. When setting up, the location, the orientation
and the environmental conditions can be adapted to
achieve a satisfactory signal quality level. If the signal
quality is regularly logged, a deterioration of the
performance can be countered in a preventative manner
by adapting the location, orientation and environmental
conditions to avoid risking a failure.
4.8.2 Mathematics/Algorithm
The signal quality results from the ratio of the gap between
the switching threshold and currently available light energy
(Current Receiver Level) and the gap between the
switching threshold and taught-in 100 % reference (see
Fig. 4-14 on page 41).
A maximum signal quality of 100 % is achieved when the
received light energy (Current Receiver Level) corresponds
to the last taught-in 100 % reference. A signal quality of
0 % is achieved when the light energy still received
corresponds to the set switching threshold. The signal
quality is only updated if the received light energy is above
the switching threshold.
When using the LSSC profile with multiple switching
channels (SSCs), the signal quality results from the
minimum signal quality of all switching channels.
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In addition, the monitoring of the signal quality offers an
immediate response in the event of a critical failure. This
reaction is triggered if the signal quality drops below the
adjustable threshold value and gives the all clear if a
satisfactory signal quality level is once again achieved. The
signal state is also indicated by an orange LED that
illuminates if the signal quality is below the threshold value.
The function can be deactivated by setting the threshold
value to zero.