Choosing a Pull-up Resistor
Choose a pull-up resistor that does not exceed the maximum current sink rating of the isolated
outputs. The pull-up resistor must have a power rating that will not cause it to overheat.
For example, with a 24 V output, a 2 kΩ resistor will cause a current sink of 24 V / 2 kΩ = 12
mA. This leads to a power consumption in the resistor of 12 mA × 24 V = 0.288 W. In this
example, a 0.5 W resistor would be recommended. Because 12 mA is less than the current sink
rating, a 2 kΩ, 0.5 W resistor would be acceptable.
The resistor value also affects the rise time of the output. For example, a 1 kΩ resistor will rise
more quickly than a 2 kΩ resistor, but the 1 kΩ resistor will consume more power and require
a resistor with a higher power rating.
Related Information
Wiring a Lighting Device for Strobe Mode
Wiring an Isolated Output to a Sinking Input
Wiring an Isolated Output to a Sourcing Input
on page 15
Safe Mode (NI Linux Real-Time)
When you boot the ISC-178x into safe mode, it launches only the services necessary for
updating its configuration and installing software. Connect the Iso In 3 and C
IN
signals of the
ISC-178x as shown in the following figure, then apply power to boot into safe mode.
Figure 15.
Booting into Safe Mode
ISC-178x
Iso In 3
C
IN
C
V
External
Power Supply
+
–
Image Sensor
This section provides an overview of the ISC-178x image sensors, field of view, and imaging
settings.
All models of the ISC-178x use ON Semiconductor Python NOIP1SN or NOIP1SE sensors.
ISC-178x are available with the following resolution configurations.
16
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ni.com
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ISC-178x User Manual
Summary of Contents for ISC-1783
Page 1: ...ISC 1783...
