pin. NI recommends you provide independent COM and Vsup
wiring for each channel to minimize current flow in the COM
and Vsup 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.
Connecting an External Power Supply
You must connect an external power supply to the NI 9475. This
power supply provides the current for the devices you connect to
the module. Connect the positive lead of the power supply to
Vsup and the negative lead of the power supply to COM.
Caution
Do not remove or insert modules if the
external power supply connected to the Vsup and COM
pins is powered on.
The NI 9475 has current sourcing outputs, which means the DO
pin is driven to Vsup when the channel is turned on.
NI 9475 Getting Started Guide
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© National Instruments
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