6.3.3
Belt Position Triggering
On a conveyor with an encoder, a sensor detects product presence. There are two cameras which
need 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.
O
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1
5
4
0
2000
encoder
counts
100us
0
I, O
(3)
1
5
4
0
4000
encoder
counts
100us
0
I, O
(3)
Set input mode to 2-wire encoder.
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.
6.3.4
Pulse Burst
A sensor on IP1 detects product presence. Four images need to be taken from one camera using
four different lights at 40ms intervals. OP1, OP2, OP3, OP4 are used to output triggers to turn on
the four lights in sequence. OP5 is used to trigger the camera four times.
