53
8.4.4 Trigger
Trigger signals are used to synchronize the camera exposure and a machine cycle or, in
case of a software
trigger, to take images at predefined time intervals
.
Trigger (valid)
Exposure
Readout
Time
A
B
C
Different trigger sources can be used here.
8.4.5 Trigger Source
ph
oto
electric sens
or
trigge
r signal
pr
og
ra
mm
able logic co
ntr
olle
r
others
so
ftwa
re trigge
r
Har
dware
trigger
VEXU
VEXG
Each trigger source has to be activated separately. When the trigger mode is activated,
the hardware trigger is activated by default.
▲ Figure 32
Trigger signal, valid for
Baumer cameras.
high
low
U
t
0
0.8V
3.3V
30V
◄ Figure 33
Camera in trigger
mode:
A - Trigger delay
B - Exposure time
C - Readout time
Trigger Delay:
The trigger delay is a
flexible user-defined delay
between the given trigger
impulse and the image cap-
ture. The delay time can be
set between 0.0 μsec and
2.0 sec with a stepsize of
1 μsec.
◄ Figure 34
Examples of possible
trigger sources.