Baumer EXG Посібник користувача - Сторінка 25

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Baumer EXG Посібник користувача

4.6.4 Debouncer

The basic idea behind this feature was to seperate interfering signals (short peaks) from 
valid square wave signals, which can be important in industrial environments. Debouncing 
means that invalid signals are filtered out, and signals lasting longer than a user-defined 
testing time t
 will be recognized, and routed to the camera to induce a trigger.
DebounceHigh
In order to detect the end of a valid signal and filter out possible jitters within the signal, a 
second testing time t
DebounceLow 
If the signal value falls to state low and does not rise within t
as end of the signal.
The debouncing times t
of 1 μsec.
This feature is disabled by default�
U
30V
Incoming signals
(valid and invalid)
11V
4.5V
0
Debouncer
U
30V
Filtered signal
11V
4.5V
0
4.6.5 Flash Signal
This signal is managed by exposure of the sensor.
Furthermore, the falling edge of the flash output signal can be used to trigger a movement 
of the inspected objects. Due to this fact, the span time used for the sensor readout t
can be used optimally in industrial environments. 
4.6.6 Frame Counter
The frame counter is part of the Baumer image infoheader and supplied with every image, 
if the chunkmode is activated. It is generated by hardware and can be used to verify that 
every image of the camera is transmitted to the PC and received in the right order.
was introduced. This timing is also adjustable by the user. 
 and t
 are adjustable from 0 to 5 msec in steps 
DebounceHigh
DebounceLow
t
t
1
2
t
DebounceHigh
t
x
t
DebounceHigh
t
DebounceLow
 , this is recognized 
DebounceLow
t
t
t
3
4
5
t
DebounceLow
- high time of the signal
- user-defined debouncer delay for state high
- user-defined debouncer delay for state low
Debouncer:
Please note that the edges
of valid trigger signals are
shifted by t
t
DebounceLow
Depending on these
high
two timings, the trigger
signal might be temporally
low
stretched or compressed.
t
t
6
t
high
low
t
◄ Figure 33
Principle of the Baumer 
debouncer.
readout
and
DebounceHigh
!
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