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National Instruments NI-9425 C Series digital input module
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National Instruments · CompactDAQ / CompactRIO

NI-9425

The NI-9425 is a 32-channel C Series sinking digital input module for industrial logic signals. This catalog record identifies the D-Sub version associated with part number 779139-01.

ManufacturerNational Instruments
ModelNI-9425
Part Number779139-01
Product TypeC Series digital input module
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30-Day Returnspolicy applies
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Digital inputs32 sinking channels
Logic level24 V industrial logic
Signal connection37-pin D-Sub
Isolation60 V DC continuous channel-to-earth, CAT I (D-Sub)
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Overview

Product overview

Key product information and technical features.

The NI-9425 connects industrial switches, transducers and other digital devices to a modular C Series system. Its sinking inputs accept signals from sourcing devices.

NI offers multiple NI-9425 connector variants. Use the D-Sub documentation and accessories for the 779139-01 version; spring-terminal isolation specifications do not apply to this connector variant.

  • 32 digital input channels with sinking input circuitry.
  • Supports direct connections to industrial 24 V logic signals.
  • D-Sub version supports NI-9923 front-mount terminal-block connectivity.
Verified specifications

Technical data

Verified product specifications.

Digital input channels32 channels
Input typeSinking
Signal connector37-pin D-Sub
OFF-state input voltage≤5 V
ON-state input voltage≥10 V
Input impedance30 ±5% kΩ
Update/transfer time7 maximum in CompactRIO; 8 maximum with cRIO-9151. Other systems have additional driver and system latency. µs
D-Sub channel-to-earth isolation60 continuous, CAT I V DC
Channel-to-channel isolationNone
Operating temperature-40 to 70 °C
Condition & included items

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Included

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Compatibility

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National Instruments

Manufacturer

C Series

Modular I/O family for CompactDAQ and CompactRIO systems

NI-9425

Sinking digital input module

CompactDAQ limitation

The NI-9425 cannot perform counter operations in a CompactDAQ chassis.

Confirm the connector variant and chassis support before selecting wiring accessories.
Manuals & software

Technical resources

Manuals, software and technical resources for this model.

NI-9425 Official Product PageProduct Page · ni.com
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NI 9425 DatasheetDatasheet · download.ni.com
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NI-9425 Dimensional DrawingsDimensional Drawings And CAD Models · ni.com
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NI-9425 Mechanical Drawings and CAD ModelsTechnical resource
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Shipping, warranty & returns

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Warranty
30-Day Warranty. Standard coverage applies.
Returns
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Related products

Alternatives & system components

Related model
NI-9421View product →
Related model
NI-9423View product →

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CompactDAQ

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FAQ

Product-specific questions

Product-specific answers based on available technical information.

Can the NI-9425 perform counter operations in CompactDAQ?

No. NI explicitly excludes counter operations when this module is used in a CompactDAQ chassis.

Which terminal block does NI list for the D-Sub version?

NI lists the NI-9923 front-mount terminal block, part number 781503-01, for NI-9425 part number 779139-01.

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