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NI 9421

8-Channel 24 V Logic, 100 µs, Sinking Digital Input Module

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  • 8-channel, 100 us digital input
  • Hot-swappable operation
  • -40 to 70 °C operating range
  • 12 to 24 V logic, sinking digital inputs
  • Extreme industrial certifications/ratings
  • D-Sub or screw-terminal connector options
  • Data Sheet  |  Specifications popup  |   Configure System popup

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Module Accessories   Chassis, Controllers, Modules Software & Services
Step 1: Verify Device and Quantity Selection
Part
Number		 Description Est Ship Days Glossary Definition US Dollars
(change) 		Qty
779002-01 NI 9421 -- For price, select country  
Step 2: Select Optional Accessories
Part
Number		 Description Est Ship Days Glossary Definition US Dollars
(change) 		Qty
Screw Terminals
779017-01 NI 9932 Backshell with 10-pos connector block (qty 1)
NI Recommended		 -- For price, select country  
779105-01 NI 9936 10-pos screw term connector block (qty 10) -- For price, select country  
Step 3: Add to Cart or Get a Quote

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The National Instruments NI 9421 is an 8-channel, 100 µs sinking digital input module for any NI CompactDAQ or CompactRIO chassis. Each channel is compatible with 12 to 24 V signals and features transient overvoltage protection of 2,300 Vrms between the input channels and earth ground. Each channel also has an LED that indicates the state of that channel. The NI cRIO-9421 works with industrial logic levels and signals for direct connection to a wide array of industrial switches, transducers, and devices.

There are two connector options for the NI 9421 - a 10-position screw-terminal connector and a 25-position D-Sub connector. This industry-standard 25-position D-Sub connector provides for low-cost cabling to a wide variety of accessories available from NI or other vendors. A number of vendors with custom D-Sub cable fabrication services can deliver cables with a pinout that matches your exact application needs.

NI recommends the NI 9932 strain-relief connector accessory for the NI 9421 for screw-terminal connectivity and the NI 9934 accessory for 25-position D-Sub connectivity.

Data Sheet | View Pricing and Purchasing Information »

Specifications Documents


Specifications Summary


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Factory Installation

Reduce your setup time with National Instruments installation services and get a system you can use out of the box. Factory installation services include:

  • Installation of all individual hardware and software components as well as full testing to eliminate conflicts
  • Custom documentation plus a custom restore and startup utility
  • 2-year warranty and calibration coverage

This service is only available for PXI, CompactRIO, and Compact FieldPoint systems.

Extended Warranties

National Instruments designs and manufactures all products to minimize failures, but we know unexpected failures can still occur. Extended warranties provide a fixed economical price at the time of system purchase covering any repair costs for up to three years.

  • Significant cost savings compared to individual repair incidents
  • Fault location, diagnostics, and repair by NI any time the system product fails
  • All parts and labor costs covered as well as any adjustments needed to bring the hardware back to manufacturing specifications

Calibration

NI recognizes the need to maintain properly calibrated devices for high-accuracy measurements. We provide manual calibration procedures, services to recalibrate your products, and automated calibration software to calibrate many of our measurement products.

Training

NI training is the fastest, most certain route to productivity with NI tools and successful application development.

Repair Services

  • You can return your registered product under warranty at no additional labor and parts cost. NI offers fault location, diagnostics, and repair any time the system fails as well as any adjustments needed to bring the hardware back to manufacturing specifications.
  • Contact us to obtain a Return Material Authorization (RMA) form and shipping instructions
  • View your RMA support request status online
  • Register your product

Technical Support

www.ni.com/support

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