Festo SDAT-MHS - Switching Functions and Switching Logic

SDAT-MHS
8 Festo – SDAT-MHS – 2017-11f English
Scaling of the analogue signal
The analogue output signal 4…20 mA is assigned as standard to the complete sensing range. If only a
part of the sensing range is used, the analogue value output can be scaled to the sensing range actually
used. Resolution and repetition accuracy are not improved through scaling.
2 mA
20 mA
4 mA
0 mm 60 mm 120 mm 160 mm
12
Scaled
Not scaled
Analogue signal
1 Teach point 1
2 Teach point 2
Fig. 3 Scaling of the analogue signal (example SDAT-MHS-M160)
2.2 Switching functions and switching logic
2.2.1 Window comparator
OUT
IN
Switching travel
hysteresis
12
1 Teach point 1
2 Teach point 2
Fig. 4 Window comparator
The teach points (1,2) are linked to the window comparator function.
– The position of the teach points determines the window width.
– Hysteresis is not selectable or preset.