National Instruments NI-9423 8-channel sinking digital input module

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National Instruments · CompactDAQ / CompactRIO

NI-9423

The NI-9423 is an 8-channel C Series sinking digital input module for industrial logic signals, with 1 µs digital update timing. It supports correlated digital measurements, triggering, and synchronization in CompactDAQ systems.

ManufacturerNational Instruments

ModelNI-9423

Part Number779009-01

Product Type8-channel sinking digital input module

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Inputs8 sinking digital input channels

Digital update timing1 µs

Logic levels12 V and 24 V

Isolation250 Vrms channel-to-earth ground

Terminal variant779009-01: screw terminal; physical variant requires confirmation

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Overview

Product overview

Key product information and technical features.

The NI-9423 connects industrial switches, transducers, and other discrete logic devices to a modular NI measurement system. Each input has an LED for channel-state indication, and the module accepts discrete logic signals up to 30 V.

As a correlated digital module, it supports measurements synchronized with other operations in a CompactDAQ chassis. NI also documents use in CompactRIO systems. The catalog tag identifies part number 779009-01, which NI assigns to the screw-terminal version; the legacy spring-terminal description conflicts with that identification.

Eight dedicated sinking digital inputs.
Individual LEDs indicate input channel status.
Correlated digital measurement, triggering, and synchronization in CompactDAQ.
250 Vrms channel-to-earth-ground isolation.

Verified specifications

Technical data

Verified product specifications.

Digital input channels	8 channels
Input type	Sinking
Maximum digital update rate (NI terminology)	1 µs
Maximum input delay	1 µs
ON-state input voltage	11 to 30 V
OFF-state input voltage	≤5 V
Continuous channel-to-earth-ground isolation	250; Measurement Category II Vrms
Channel-to-channel isolation	None
Operating temperature	-40 to 70 °C

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National Instruments

Manufacturer

C Series

Modular I/O interface for CompactDAQ and CompactRIO

NI-9423

Sinking digital input module

CompactDAQ

Supports correlated measurements, triggering, and synchronization.

Confirm the module label and terminal variant before selecting wiring accessories; 250 Vrms isolation does not permit 250 V logic inputs.

Manuals & software

Technical resources

Manuals, software and technical resources for this model.

NI-9423 Official Product PageProduct Page · ni.com

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NI 9423 DatasheetDatasheet; Introductory Timing Error Corrected By NI Support · download.ni.com

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NI-9423 Maximum Sampling RateOfficial Timing Clarification · knowledge.ni.com

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Official NI-9423 Timing ClarificationTechnical resource

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FAQ

Product-specific questions

Product-specific answers based on available technical information.

Is the NI-9423 a digital output module?

No. It has eight dedicated sinking digital inputs, with no digital output or bidirectional channels.

Does the NI-9423 have 1 µs or 100 µs timing?

NI specifies 1 µs digital update timing and a maximum input delay of 1 µs. NI's support clarification identifies the 100 µs statement in the datasheet introduction as an error.

Which terminal type corresponds to part number 779009-01?

NI identifies 779009-01 as the screw-terminal version and 783735-01 as the spring-terminal version. This catalog record contains conflicting terminal information, so the physical module label should be checked.