Connecting Digital Devices; Protecting The Digital Outputs From Flyback Voltages - National Instruments NI-9375 Getting Started

Connecting Digital Devices

You can connect a variety of industrial devices, such as solenoids, motors, actuators,
relays, and lamps to the NI-9375. You must connect an external power supply to the
NI-9375. The power supply provides the current for the output channels.
Figure 3. Connecting an Industrial Device to the NI-9375
V
sup
DO
Device
DO COM
NI 9375
Caution
if any external power supplies connected to the V
powered on.
Attention
système si une alimentation externe connectée aux broches V
est sous tension.
Ensure that the devices you connect to the NI-9375 are compatible with the output
specifications of the NI-9375. Refer to the device specifications at
output specifications.
Note
When the industrial device is off, DO is not connected to COM. For
large source impedances, you must use a pull-down resistor between DO
and COM. Go to

Protecting the Digital Outputs from Flyback Voltages

If the channel is switching an inductive or energy-storing device such as a solenoid,
motor, or relay, and the device does not have flyback protection, install an external
flyback diode.
8
ni.com
External
+
Power
–
Supply
Do not install or remove C Series modules from your system
Ne pas installer ou retirer les modules de la Série C de votre
ni.com/r/cseriesdopulsegen
NI-9375 Getting Started
and COM pins are
sup
sup
ni.com/docs
for more information.
et COM
for