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Chapter 4
Connecting Lighting and External Devices
Caution
The 24 V external lighting strobe is an unregulated output dependent on
the range of the power supply provided to the smart camera. If the power provided to
the smart camera is +20%/-15% with +5% AC ripple, the output could be as high as
30 V. If the provided power exceeds the input voltage specifications of the third-party
lighting controller, do
not
connect the 24 V lighting strobe output to the controller to
prevent damage to the controller. Use a power supply with tolerances that meet the
requirements of the controller, or use the 5 V external lighting strobe.
When enabled, the 5 V and 24 V external strobe outputs create a strobe pulse that can be used
as a level-sensitive signal by third-party controllers to strobe the light simultaneously with the
image exposure. Alternatively, if the third-party lighting controller supports a programmable
strobe time, the controller can be programmed for any arbitrary strobe duration, and the assertion
edge of the smart camera output can start the strobe timer in the controller.
Caution
If you are using the 5 V strobe output or the 24 V strobe output, the
software does not impose any limits on the duration or the duty cycle of the strobe
output. You must ensure that your requested exposure time and the frame rate result
in duration and duty cycle that do not violate the limits of the external controller
and/or light(s). Refer to the
Maximum Frame Rate
section of Chapter 6,
Image
Acquisition
, for more information.
Enable the 5 V and 24 V lighting outputs as follows:
•
In Vision Builder AI, enable the
5 V TTL Strobe
and/or
24 V Strobe
controls on the
Lighting
tab of the
Acquire Image (Smart Camera)
step. Refer to the
NI Vision Builder
for Automated Inspection: Configuration Help
for more information about configuring the
5 V TTL and 24 V strobe outputs.
•
In LabVIEW, configure the
24V Strobe
and
5V Strobe
lighting properties. Refer to the
NI-IMAQ VI Reference Help
for more information about configuring the 5 V TTL and 24 V
strobe outputs.
•
In MAX, select the
5 V TTL Strobe
and/or
24 V Strobe
checkboxes on the
Lighting
tab
of the smart camera configuration page. Refer to the
Measurement & Automation Explorer
Help for NI-IMAQ
for more information about configuring the 5 V TTL and 24 V strobe
outputs.
