V01.00 | 2021/11
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4.3 Operating principle
The FMCW radar (frequency modulated continuous wave) measures the distance to stationary
objects.
The sensor outputs a radar signal that changes in frequency. A periodic, linear frequency which
varies upwards and downwards is used to limit the frequency range and to simplify the signal
evaluation. The rate of change df/dt of frequency remains constant. Objects in the detection
range reflect the transmitted signal. The change in the signal delay and frequency of the reflec-
ted signal are used to determine the distance to the object.
The frequency modulated continuous wave radar therefore has a clear advantage over the un-
modulated continuous wave radar, which cannot detect distances.
4.4 Functions and operating modes
The device measures the distance between the detected object and the end of the sensor
housing. A single switch point or window function can be set for the switching outputs. The
measuring range of the analog output can be defined as required within the measuring range
limits. The device provides analog or switching signals at the outputs depending on type. The
measured value is also sent via the IO-Link process data to the higher control level. The dis-
tance value can be transferred in m via the process data. The device parameters can be set via
IO-Link and via the teach-in function.
4.4.1 Setting options
The devices feature the following three setting options:
n Setting via IO-Link
n Setting via teach-in function
n Setting via FDT/DTM
4.4.2 Output functions – switching output
The following sensor functions are available for the switching outputs:
n Single point mode
n Window mode
n Two point mode
Digital output – single point mode
In Single point mode one switch point can be set for the digital output either via IO-Link (in-
dices 0x3C and 0x3E) or with an available target. The hysteresis can be set.
Fig.2: Single point mode
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