A signal is output if the measured distance value has undershot (normally open – High
Active) or exceeded (normally closed – Low Active) the switching point.
If the “DtO” switching mode is selected, the required settings can be taught in or set
manually.
7.3.8.3
Setting Window switching mode
An upper and a lower switching threshold are set for the switching output. A switching
signal is output when the measured value is between the two switching thresholds (in
the window).
7.3.8.4
Setting edge height change switching mode
The edge height change function supplies a signal at the set device channel as soon as
there is a change in value between two measured values. A typical application for this
function is counting shingles in printing applications. The device takes on the complex
evaluation tasks carried out by the control system.
The following settings must be configured on the device in order to use the edge height
change function:
Maximum and minimum height change
The maximum and minimum height change values define the smallest and largest dif‐
ference in mm by which the two measured values must differ in order for there to be an
edge height change. This function only takes into account the difference between two
measured values and is independent of the absolute distance of the object.
Change direction
•
Both: All changes in measured values within the set limits are detected.
•
Positive: Only changes in measured values within the set limits which result in
larger distances are detected (factory setting).
•
Negative: Only changes in measured values within the set limits which result in
smaller distances are detected (to factory setting).
Hysteresis
Hysteresis is the difference in distance between the switch-on and switch-off points.
This is necessary to ensure a stable signal when the measured distance fluctuates
around the switching point that has been set. Hysteresis can be configured freely with
most distance sensors and is stated in mm. More precise logic can be achieved by set‐
ting a lower value. Choose a higher value to ensure a more stable signal and reduce the
probability of a faulty switch.
Cycle offset
The cycle offset value specifies which previous output value is compared with the value
currently measured.
NOTE
A permanently set cycle time (
≥
25 µs) must be used in the edge height jump operating
mode,
see "Setting the sampling duration", page 37
. This ensures time consistency for
the output of measured values.
This switching function cannot be used in combination with the “Auto” sampling rate. In
this case, the device independently changes the sampling rate from “Auto” to the stan‐
dard value.
The allowed values are 0 to 100,000 (number of measurements), the default value is
20.
7
OPERATION
48
O P E R A T I N G I N S T R U C T I O N S | OD5000
8021391/17Y6/2020-05-11 | SICK
Subject to change without notice
