Balluff BOS R254K-UUI-RH10-S4, Configuration Manual

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5
Primary Device Functions (continued)
5.7 Signal Quality
5.7.1 Description
The signal quality is specified in percent steps as a value
between 0 and 100%. If the signal quality cannot be
provided, a substitute 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 prevent failure.
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.
5.7.2 Mathematics/Algorithm
The signal quality is based on the received signal strength.
A maximum signal quality of 100% is reached when the
signal strength reaches or exceeds the internal threshold
for optimal evaluation.
A signal quality of 1% is reached when the existing signal
strength can only just be evaluated.
If the received signal strength drops below a signal
strength that can be evaluated, the signal quality is 0%. If
no signal is received, the signal quality is set to 255 (the
signal quality cannot be calculated)
5.7.3 Process Data
Object ID Name Description Direction
0x0020 (32) Current Signal Quality Output of the current signal quality in percent
steps from 0% to 100%.
Input
0x0021 (33) Signal Quality Bad Output of the current signal quality evaluation;
TRUE means a signal quality below the threshold
value, FALSE means a signal quality equal to or
above the threshold value.
Input
Tab. 5-27: Signal quality – process data
Also see section Process Data Profiles on page 10.
BOS R254K-UUI-RH10-S4
Photoelectric Sensors