Protecting The Digital Outputs From Flyback Voltages - National Instruments NI 9375 Getting Started Manual

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.
NI 9375
Figure 2. Connecting a Flyback Diode
V
sup
DO
DO COM
NI 9375 Getting Started Guide | © National Instruments | 15
Flyback
Inductive
Diode
Device
External
+
Power
–
Supply