Starting up the device
Leuze electronic
ODS 9
37
TwoPoint – two-point mode
• Closer than setpoint SP2, the output is set to
high active
(as with the Single Point modes).
• The "far" hysteresis area lies between setpoint SP2 and setpoint SP1; the
Hysteresis
parameter is not
used here.
• After setpoint SP1, the output is set to
low active
.
1
2
3
5
6
7
4
1
Setpoint SP1
2
Setpoint SP2
3
Hysteresis "near"
4
Hysteresis "far"
5
Sensor/SSC
6
Signal response
7
Measurement range minimum
Fig. 7.5:
TwoPoint switching point mode
NOTICE
The
Hysteresis
parameter is used for the switch-on/switch-off edges at the start of the measure-
ment range.
Ä
If setpoint SP2 is too close to the switch-on edge, the assigned switching edge is shifted into
the distance by the distance of the
Hysteresis
parameter.
Ä
If, afterwards, setpoint SP1 is closer than the shifted edge, the edge assigned to setpoint
SP1 is placed on the shifted SP2 edge. The two far switching edges then decrease together.
NOTICE
The output state in the hysteresis area is not uniquely defined!
The output state in the hysteresis area is dependent on the previous situation.
If the output in the hysteresis area is permanently set to
high active
, a short detection failure (no
signal, e.g., due to a target that is marginally dark) results in a change to permanently
low active
(dark switching).
