TR-HT2xx LED Controller - User Manual
9.4
Belt position triggering
On a conveyor with an encoder, a sensor detects product presence. There
are two cameras which are to take an image at fixed distances along the
belt. The camera trigger pulses must be fixed width for exposure control.
The trailing edge of IP4 is used as the trigger. OP1 triggers the first camera
after 2000 encoder counts. OP2 triggers the second camera after 4000
encoder counts. Both camera triggers are negative pulses. The
configuration details for this are shown below:
Output
Mode
Input
Gate
input
Pulse
delay
Pulse
width
Retrigger
time
Flags
1
5
4
0
2000
encoder
counts
100μs
0
I, O (3)
1
5
4
0
4000
encoder
counts
100μs
0
I, O (3)
Both outputs are set into pulse mode. The pulse delay is a number of
encoder pulses and the pulse width is a fixed time. The flags specify the
trailing edge of the trigger signal and that the output pulse is active low.
9.5
Multiple exposures with different lighting
A sensor on IP1 detects the presence of a product. Two images need to
be taken from one camera using two different lights at a 40ms interval.
CH1, and CH2 are the two lighting outputs. OP1 is used to trigger the
camera two times, synchronised to the lights.
Output
Mode
Input
Gate
input
Pulse
delay
Pulse
width
Retrigger
time
Flags
CH1
Pulse
1
-
0ms
40ms
0
-
CH2
Pulse
1
-
40ms
40ms
0
-
OP1
8
1
4
40ms
100μs
0
0
CH1 and Ch2 are pulsed for 40ms in sequence. As each one is pulsed,
OP1 is also pulsed for a short time to trigger the camera (Gate Input = 2,
specifying two pulses). The timing diagram is shown overleaf:
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