Need of a Pull-Up or Pull-Down Resistor for NI 9425

Updated Oct 5, 2025

Reported In

Hardware

  • NI-9425

Issue Details

I would like to know about using a pull up resistor with digital input module NI 9425. 

 

  • Are there any pull up or pull down resistances built into the module?
  • What value of resistance does NI recommend to use as pull up resistance for 24V supply?

 

Solution

The NI 9425 does not have any pull-up or pull-down/current-limiting resistors at the inputs. The only built-in protection is 30 kΩ  input impedance, as per the NI 9425 Datasheet.

 

You should be able to apply a 24 V logic input, without the need for additional circuitry for a pull-up resistance. Also, please note that the NI 9425 has a sinking input, as shown in the NI 9425 block diagram in the NI-9425 Getting Started manual. 


1378 

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