National Instruments NI 9475, Руководство по эксплуатации

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© National Instruments Corp. 7 NI 9475 Operating Instructions and Specifications
Each channel of the NI 9475 has a DO pin to which yo u can
connect a device. Each channel also has a COM pin and a V
s u p
pin.
National Instr u ments recommends yo u provide independent COM
and V
s u p
wiring for each channel to minimize c u rrent flow in the
COM and V
s u p
wiring. The COM pins are all connected together
internally.
Each channel has an LED that indicates the state of the channel.
When a channel LED is lit, the channel is on. When the LED is
dark, the channel is off.
Yo u m u st connect an external power s u pply to the NI 9475. This
power s u pply provides the c u rrent for the devices yo u connect to
the mod u le. Connect the positive lead of the power s u pply to V
s u p
and the negative lead of the power s u pply to COM. Refer to the
Specifications section for information abo u t the power s u pply
voltage range.
Caution
Do not remove or insert mod u les if the external
power s u pply connected to the V
s u p
and COM pins is
powered on.
The NI 9475 has c u rrent so u rcing o u tp u ts, meaning the DO pin is
driven to V
s u p
when the channel is t u rned on.