Allen-Bradley 1791-NDV: DC Voltage I/O Module

Introducing the Allen-Bradley 1791-NDV, a key part for your control panel. This module handles 4 analog inputs and 2 voltage outputs. It is powered by 24V DC for easy integration. Built tough for factory environments with wide temperature tolerance. The 1791-NDV delivers precise data for your PLC system. It's the reliable link between your sensors and controllers.

Quick Overview & Benefits

• Multiple Inputs: 4 channels to connect various sensors.
• Voltage Outputs: 2 stable voltage outputs for direct control.
• High Precision: 0.1% accuracy and 14-bit resolution for clear data.
• Robust Design: Works in hot conditions from 0°C to 60°C.
• Strong Safety: Indefinite short-circuit protection on outputs.
• Simple Power: Uses common 24V DC industrial power supply.

Detailed Technical Specifications

Brand & Model: Allen-Bradley 1791-NDV
Product Line: 1791 Block I/O
Module Type: DC Analog Voltage I/O
Total Channels: 6 (4 Input, 2 Output)
Input Channels: 4 Analog (Configurable)
Output Channels: 2 Voltage Outputs
Input Resolution: 14-bit full scale
Output Impedance: < 1 Ohm
Input Impedance: 10 MΩ (Voltage), 250 Ω (Current)
Update Rate: 108 ms per channel
Absolute Accuracy: ±0.1% @ 25°C
Linearity: 0.05% @ 25°C
Input Bandwidth: 5 Hz
Short-Circuit Protection: Indefinite (Outputs)
Overvoltage Protection: 140V AC
Power Supply: 24V DC (19.2 - 30V DC Range)
Current Draw: 600 mA max.
Power Dissipation: 11.52 Watts max.
Operating Temperature: 0°C to 60°C
Storage Temperature: -40°C to 85°C
Relative Humidity: 5 to 95% (non-condensing)
Dimensions (H x W x D): 6.95" x 2.7" x 3.85"
Weight: 1.19 lbs (0.54 kg)

Installation Made Easy

Mount the module securely on a DIN rail. Ensure your 24V DC power supply is within the 19.2-30V range. Connect your sensor wires to the input terminals. Connect your actuator wires to the voltage output terminals. Keep wiring tidy and avoid running signal wires next to power cables. Configure the module's parameters through your PLC programming software.

Package & Warranty Details

You will receive:
• 1 x Allen-Bradley 1791-NDV Analog I/O Module
• Installation guide and datasheet
(Power and communication cables are not included)

We offer a full 12-month warranty from the date of purchase. This covers any issues with performance or materials.

Fast Shipping Services

We deliver quickly using reliable global carriers: FedEx, UPS, and DHL. Your order will include complete tracking details for peace of mind.

Frequently Asked Questions

What types of signals can the 4 inputs read?

The inputs can be configured for standard voltage signals (like 0-10V) or current signals (like 4-20mA). This makes them suitable for temperature sensors, pressure transmitters, and level gauges.

Can this module output a 0-10V signal to control a variable speed drive?

Yes. The two outputs are voltage outputs. You can typically configure them in your PLC program to send a 0-10V signal, which is a common command signal for many motor drives.

The operating temperature goes up to 60°C. Is a cooling fan required?

Not usually inside a control panel. The module's design handles this heat. However, ensure your panel has general ventilation and is not placed next to a major heat source like a furnace.

What does "indefinite short-circuit protection" mean in practice?

If the two output wires touch accidentally, the module will instantly limit the current to a safe level. It will not be damaged and will return to normal operation once the short is removed. You don't need to replace a fuse.

How do I know if my PLC-5 is compatible with this block I/O module?

Check that your PLC-5 processor supports Block Transfer instructions. Most do. You will also need a 1771 I/O chassis with an adapter to connect the 1791 block I/O network.

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