National Instruments NI 9478

Each channel of the NI 9478 has a DO pin to which you can

connect the load you want to control. Each channel also has a COM

pin. NationalInstruments recommends you provide independent

COM wiring for each channel to minimize current flow in the

COM wiring. The COM pins are all connected together internally.

You must connect an external power supply to the NI 9478. 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 pin is powered on.

The NI 9478 has current sinking outputs, meaning the DO pin is

driven to COM when the channel is turned on.

You can directly connect the NI 9478 to a variety of industrial

devices such as solenoids, motors, actuators, relays, and lamps.

Make sure the devices you connect to the NI 9478are compatible

with the output specifications of the module. Refer to the

Specifications section for more information about the output

specifications.