Balluff BOS 21M-UUI-LH31-S4 Notice D'utilisation page 26

Photoelectric Sensors
Laser precision sensor with background suppression and additional functions
BOS 21M-UUI-LH31-S4
Setting hysteresis
The hysteresis (parameter 0x003D) can be increased or
decreased in both sensor principles depending on the
application. The value range for hysteresis is not expressed
in percent. The value range is 0...10. A value of 0
represents minimum hysteresis.
Time functions
Using IO-Link (parameter 0x00B8 and 0x00B9) a
switch-on and/or switch-off delay or a single pulse can be
assigned to the digital switching outputs. Possible times lie
between 0...65535 ms.
Switch-on delay
The switch-on point is output on the switching output with
a delay. The switch-off point is directly output on the
switching output.
Single pulse
Only the switch-on point is determinate. It is output directly
on the switching output, and the switching signal remains
in effect for the configured time.
switch-off delay
The switch-off point is output on the switching output with
a delay. The switch-on point is output with no delay.
On/off delay
The switch-on and switch-off points are output on the
switching output with a delay.
Light
No light
on
off
on
off
on
off
on
off
Fig. 9: Overview of time functions
Applications for the time functions include for example
adjusting the length of the switching signal to the controller
or debouncing of the light reception signal.
Darkness measurement
Enabling darkness measurement (parameter 0x0421)
makes the sensor less sensitive to ambient light.
Interference is filtered out. The measurement does
however take longer and the switching frequency may be
reduced.
8 english
Count function
In IO-Link mode parameter 0x00B6 can be used to
configure the count function. A preselected value is
specified (Limit). The counter begins with counter value 0.
The counter value is incremented by 1 with each object
detection. When the preselected value is reached the
counter output and process data bit OK are set.
As soon as the count function is enabled Pin 4 in SIO
mode represents the counter output (always normally
open, output type remains configurable).
In IO-Link mode the process data bit OK is set as soon as
the preselected value is reached. The absolute counter
value is output with the process data.
If the counter value is less than the preselected value, the
process data bit Too Low is also set. If the counter value is
greater than the preselected value, the process data bit
Too High is also set.
After turning the sensor on the counter value is always 0.
The counter can be reset in various ways:
– Counter Mode STATIC (with Reset command)
– Counter Mode AUTO (automatic Reset)
Counter Mode STATIC (with Reset command)
The counter value and counter output are reset by the
Reset signal.
In IO-Link mode therefore the Reset bit is set in the
process data.
For SIO mode Pin 2 must be configured as an input
(parameter 0x00BC). A High signal on the Reset input
resets the counter output.
The rising edge is always used. When there is a continuous
Light received
Reset signal the counter value and counter output are
reset only once.
Switch-on delay
Single pulse
Count pulses
switch-off delay
On/off delay
Count Value
Counter output
Fig. 10:
A debounce time (parameter 0x00BA) between
0...65535 ms can be assigned to the Reset input.
RESET
Switch Counter Limit
on
off
Preselect counter with Reset command