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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.
Figure 3. Connecting a Flyback Diode
NI 9375
External
Power
Supply
+
–
DO COM
V
sup
Inductive
Device
DO
Flyback
Diode
14 | ni.com | NI 9375 Getting Started Guide
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