PRODUCT INFORMATION
Product Overview
The Allen-Bradley 1791-NDV is an Analog Block Input/Output Module within the Block I/O 1791 platform. It operates at a nominal supply voltage of 24 Volts DC. The block accommodates up to four selectable analog inputs and provides two analog outputs. Internal analog conversion provides 14 bits of full-scale resolution. Input channels scan at an update rate of 108 milliseconds per channel. Output channels update at 10 milliseconds per channel.
The module accepts low-frequency signals using an analog input bandwidth of 5 Hertz. Common mode rejection is rated at -75 decibels to counter electrical noise. Input impedance is 10 megaohms to minimize signal attenuation on incoming channels. The output impedance is less than 1 ohm to support connected electrical loads. Maximum power dissipation is 11.52 Watts, yielding 39.28 BTU per hour of thermal output. Installers can mount the assembly in either a vertical or horizontal orientation.
TECHNICAL DATA
Technical Specifications
| Parameter | Specification |
|---|
| Weight | 1.19 lbs (0.54 kg) |
|---|
| UPC | 662468177764 |
|---|
| Update Rate Per Input Channel | 108 milliseconds per channel |
|---|
| Input Bandwidth | 5 Hertz |
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| Nominal Voltage | 24 Volts DC |
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| Number of Inputs | 4 inputs per block (selectable) |
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| Number of Outputs | 2 outputs per block |
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| Update Rate Per Output Channel | 10 milliseconds per channel |
|---|
| Input Common Mode Rejection | -75 decibels |
|---|
| Resolution | 14 bits full scale |
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| Input Impedance | 10 megaohms |
|---|
| Mounting Orientation | Vertical or horizontal mount |
|---|
| Maximum Power Dissipation | 11.52 Watts |
|---|
| Maximum Thermal Dissipation | 39.28 British Thermal Unit per hour (BTU/hour) |
|---|
| Output Impedance | Less than 1 ohm |
|---|
TECHNICAL INFORMATION
Features
- Selectable configuration supporting up to four inputs and two outputs per block.
- Nominal operating power of 24 Volts DC for industrial control panels.
- Analog conversion resolution of 14 bits full scale.
- Input channel scan update rate of 108 milliseconds per channel.
- Fast output channel update rate of 10 milliseconds per channel.
- High input impedance of 10 megaohms for low signal loss.
- Input bandwidth of 5 Hertz for low-frequency analog signal processing.
- Common mode noise rejection rated at -75 decibels.
- Low output impedance under 1 ohm for connected load circuits.
TECHNICAL INFORMATION
Applications
- Distributed analog signal acquisition in Block I/O 1791 control architectures.
- Acquisition of low-frequency analog signals requiring 5 Hertz bandwidth.
- Analog output signal generation requiring 10-millisecond update intervals.
- Remote industrial panels requiring compact horizontal or vertical block mounting.
TECHNICAL INFORMATION
Connections / Interfaces
- Field wiring terminals provide connection points for four selectable analog inputs.
- Dedicated terminal interfaces connect two analog output channels.
- Power distribution terminals receive 24 Volts DC nominal module power.
TECHNICAL INFORMATION
Installation Guidelines
- Mount the module in either a vertical or horizontal orientation inside the enclosure.
- Account for 39.28 BTU per hour thermal dissipation during cabinet cooling calculations.
- Maintain adequate clearance around the enclosure to manage thermal dissipation.
- Verify the incoming 24 Volts DC supply matches device electrical requirements.
TECHNICAL INFORMATION
Configuration Guidelines
- Configure up to four input channels based on system architecture requirements.
- Account for the 108-millisecond input update cycle in controller timing logic.
- Coordinate the 10-millisecond output refresh time with system execution sequences.
TECHNICAL INFORMATION
Compatibility
- Compatible with Allen-Bradley systems using the Block I/O 1791 platform.
- Integrates into 24 Volts DC industrial control circuits.
COMPATIBILITY
Compatibility & Replacement
COMPATIBLE MODELSCompatible with Allen-Bradley systems using the Block I/O 1791 platform. Integrates into 24 Volts DC industrial control circuits.
Verify compatibility against the exact Part Number, revision and manufacturer documentation before ordering.
PART VERIFICATION
Before You Order
Industrial automation parts can share similar model names, suffixes and revisions. Confirm the complete manufacturer Part Number before purchase.
01Check Part NumberMatch the complete ordering code on the existing unit.
02Confirm RevisionCheck suffix, hardware or firmware when applicable.
03Send a Label PhotoWe can review a clear label photo when identification is uncertain.
ORDERING PROCESS
From RFQ to Dispatch
1Submit Part Number2Verify Product Identity3Confirm Stock & Condition4Issue Quotation5Dispatch & Tracking
PRODUCT FAQ
Frequently Asked Questions
What is the update rate for the 1791-NDV input and output channels?
Each input channel updates every 108 milliseconds. Each output channel updates every 10 milliseconds.
What mounting orientations are supported for the 1791-NDV module?
The module supports installation in either a vertical or horizontal orientation.
What is the market reference price for the Allen-Bradley 1791-NDV?
Observed market prices range between $442.20 and $3,720.00 depending on condition. These figures are indicative market reference pricing only and are not a final quotation.
