National Instruments NI-9221 C Series Voltage Input Module

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National Instruments · CompactDAQ and CompactRIO

NI-9221

The NI-9221 is an eight-channel, single-ended C Series voltage input module with a ±60 V range and 12-bit resolution. The catalog references part number 779373-01, which NI identifies as the D-SUB version; the legacy screw-terminal description requires clarification.

ManufacturerNational Instruments

ModelNI-9221

Part Number779373-01

Product TypeC Series Voltage Input Module

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Inputs8 single-ended analog channels

Voltage range±60 V

Resolution12 bits

Maximum sampling800 kS/s aggregate

PlatformCompactDAQ and CompactRIO

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Overview

Product overview

Key product information and technical features.

The NI-9221 measures higher-level voltage signals in modular acquisition systems. NI identifies industrial, automotive and smaller-cell battery measurements as relevant uses.

Connector variants have different isolation ratings. Confirm the module label and connector before selecting wiring accessories or applying the legacy isolation specification.

Eight single-ended inputs for multichannel voltage acquisition.
Bipolar ±60 V measurement range.
12-bit analog-to-digital conversion.
Multiplexed acquisition rather than simultaneous sampling.

Verified specifications

Technical data

Verified product specifications.

Single-ended analog input channels	8 channels
Analog input range	-60 to +60 V
ADC resolution	12 bits
Maximum aggregate sample rate	800; 475 with R Series expansion chassis kS/s
Simultaneous sampling	No
Connector for part number 779373-01	D-SUB; physical catalog unit requires confirmation
Continuous channel-to-earth isolation, D-SUB variant	60 VDC, Measurement Category I
Channel-to-channel isolation	None
Operating temperature	-40 to +70 °C
Conformal coating, part number 779373-01	No

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National Instruments

Manufacturer

CompactDAQ / CompactRIO

Host platforms

NI-9221

C Series voltage input module

Compatibility

NI documents the NI-9221 for CompactDAQ and CompactRIO systems.

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Manuals & software

Technical resources

Manuals, software and technical resources for this model.

NI-9221 Product Page and Part-Number ComparisonProduct Page · ni.com

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NI 9221 DatasheetDatasheet · download.ni.com

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NI 9221 Getting Started GuideGetting-started Guide · download.ni.com

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NI-9221 Dimensional DrawingsDrawings And CAD Models · ni.com

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NI C Series D-SUB Cable and Accessory GuideTechnical resource

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FAQ

Product-specific questions

Product-specific answers based on available technical information.

Which connector corresponds to 779373-01?

NI identifies 779373-01 as D-SUB. The screw-terminal version is 779014-01. The supplied catalog data conflicts, so verify the physical module.

Does the 250 Vrms isolation rating apply to every NI-9221?

No. Screw- and spring-terminal variants have 250 Vrms CAT II channel-to-earth isolation; D-SUB has 60 VDC CAT I. Neither provides channel-to-channel isolation.