National Instruments NI Vision 17 Series, Руководство пользователя

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6-3
NI 17xx User Manual
Isolated Inputs section of Chapter 4, Connecting Lighting and External Devices , for information
about connecting external signals.
You can enable triggering in the following software programs:
• Vision Builder AI —Select the Triggered Acquisition checkbox on the Trigger tab of the
Acquire Image (Smart Camera)
step.
•
LabVIEW
—Use the IMAQ Configure Trigger 3 VI.
•
MAX
—Select the
Enable Trigger
checkbox on the
Triggering
tab of the smart camera
configuration page.
Figure illustrates the relationship between an external trigger, a lighting strobe, and the exposure
time.
Figure 6-1.
Externally Triggered Mode
The trigger shown in Figure represents an external trigger, configured to use the rising edge as
the active edge. The time between the active edge of the trigger and the assertion of the lighting
strobe is a user-configurable trigger delay. The trigger delay can be configured in either
milliseconds or quadrature encoder counts. The NI 1712 does not support quadrature encoders.
1 User-Configurable Trigger Delay
2 Lighting Turn-On Time
3 Beginning of Image Readout
Trigger
Lighting S tro b e
Expo su re
Im a ge Re a do u t
3
2
1