3.7.4
Window function – observation window
This function detects objects within a defined distance window during distance deter‐
mination. The limits of the distance window are signaled by a switching point close
to and far from the sensor (see
4
and
3
). This creates a safety-related observation
range. The signal level LOW indicates the requesting of the safety-related function, i.e.,
the active state has been reached due to entry of an object into the safety-related
observation range. An additional configurable hysteresis of the switching points (see
5
) provides the necessary tolerance in both switching ranges to prevent premature
switching back to the inactive state (i.e., outside the distance window).
Min.
1
Max.
2
3
1
0
5
4
5
Figure 8: Window function, observation window
1
Minimum distance
2
Maximum distance
3
Switching point 1: Lower limit of observation range
4
Switching point 2: Upper limit of observation range
5
Hysteresis of the switching points
The safety-related information of this function (request of function yes/no) can be
provided via the digital outputs (signal level Low/High) as well as in the process data via
the IO-Link interface.
Status
Digital output
Status bit (bit 0 or bit 1) in the
IO-Link process data
Active (safety-related)
Low
Static 0
Deactivated
High
Logical 1
3.7.5
Safe object detection between sensor and background
This function detects objects between the sensor itself and a background at a defined
distance (see
3
) during distance determination. The signal level LOW indicates the
requesting of the safety-related function, i.e., an object has been detected between
the sensor and the background (active state) or the installation position of the sensor
has changed (with fixed background). An additional configurable tolerance around the
background (see
4
) ensures that minimal and, in this context, non-safety-relevant
changes as well as possible measurement inaccuracies in the area of the background
do not lead to unwanted triggering of the safety-related function.
Min.
1
Max.
2
1
0
3
4
Figure 9: Safe object detection between sensor and background
1
Minimum distance
2
Maximum distance
3
Reference for switching points: Background
3
PRODUCT DESCRIPTION
18
O P E R A T I N G I N S T R U C T I O N S | DT35S
8027663//2022-08-04 | SICK
Subject to change without notice