Baumer FHDx14 IO - Manual (Page 10)

en_BA_FNDx14_FHDx14_IO.doc 10/14 Baumer Electric AG
12.04.2013/hem Frauenfeld, Switzerland
5.1.4 Hysteresis
In the direction of approach to the sensing range, the sensor actuates exactly at the taught-in switching
points. When the sensing range is re-exited, a hysteresis is added (see: Figure 4).
Figure 4: Hysteresis switching range
5.1.5 Error correction
The difference of the learning positions (distance between object and background/reflector) is too small; that
is they are closer together than 4% of the sensing range.
•
Error message Interfering parameter (see: 6.4 Table of error codes)
•
Interim is set to FFFF FFFF hex
•
Last valid values remain activated
The taught-in switching points are outside of the scanning range (see data sheet):
•
Numerical teach-in: Writing Switching points work is not possible, error message Parameter value
out of range, last valid values remain activated.
•
1-point teach-in: Error message Parameter value out of range, the sensor is adjusted to maximum
or minimum sensing distance.
•
2-point teach-in: Teach-in positions interim are not transferred, error message Parameter value
out of range, last valid values remain activated.
5.2 Dirt indicator
5.2.1 Parameters
Nominal value quality parameter: Threshold for quality evaluation of the received signal. If the received
light quantity drops below this threshold, the quality bit is set in the
process data.
- Value range:
1-8
- Factory setting: 7
Quality parameter:
Actual value of reception quality.
5.2.2 Description
Via the sensor exposure control it is possible to determine whether sufficient excess gain is still available for
reliable measurement. This excess gain is represented quantitatively by the Quality parameter. If the
Quality parameter drops below the threshold specified in the Nominal value quality parameter, this is
indicated with the quality bit of the process data.
Switching bit/Output
Distance
A B
1
0