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1791-NDC - Allen-Bradley 24VDC Analog I/O Module

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  • Vendor:

    Allen-Bradley

  • Type:

    I/O Module

  • Tags I/o module

About the Product

Product Overview: Allen-Bradley 1791-NDC Analog Block I/O Module

Key Technical Specifications

  • Brand: Allen-Bradley
  • Model: 1791-NDC
  • Series: 1791 Block I/O
  • Module Type: Analog Input / Current Output Module
  • Power Supply: 24V DC (19.2 - 30V DC Range)
  • Supply Current: 600 mA Maximum
  • Analog Inputs: 4 Channels, Selectable Type
  • Analog Outputs: 2 Channels, 0-20 mA Current
  • Input Resolution: 14-bit
  • Output Resolution: 13-bit
  • Absolute Accuracy: 0.1% at 25°C
  • Input Update Rate: 108 ms per channel
  • Output Update Rate: 10 ms per channel
  • Input Bandwidth: 5 Hz
  • Power Dissipation: 11.52 W max. (39.28 BTU/hr)
  • Weight: 1.00 lb (0.45 kg)

Analog Input Characteristics

  • All four inputs are individually selectable for signal type.
  • Supported voltage ranges: ±10V, ±5V, 0-10V, 0-5V.
  • Supported current ranges: 0-20 mA, ±20 mA.
  • Input impedance is 10 MΩ for voltage and 250 Ω for current.
  • Features excellent noise rejection: -75 dB CMRR.
  • Includes a built-in 24VDC loop power supply for 2-wire transmitters.

Analog Output Characteristics

  • The two outputs provide a standard 0 to 20 mA signal.
  • Outputs feature indefinite short-circuit protection.
  • High output impedance (>1 MΩ) ensures stable current sourcing.
  • Outputs update rapidly every 10 milliseconds for responsive control.
  • Overvoltage protection is rated up to 140V AC for durability.

Frequently Asked Questions (FAQ)

  • Q: What input signal types does the 1791-NDC accept?
    A: It accepts voltage (±10V, 0-10V, etc.) and current (0-20mA) signals on each input.
  • Q: What is the output signal from this module?
    A: It provides two 0-20 mA current output channels.
  • Q: Does it provide power for field transmitters?
    A: Yes, it includes an internal 24VDC source for loop-powered transducers.
  • Q: What is the resolution of the analog inputs?
    A: The inputs have a high 14-bit resolution for precise measurement.
  • Q: Is the 1791-NDC module in stock?
    A: Yes, we have original Allen-Bradley stock ready for fast delivery.
  • Q: What is your return policy?
    A: All purchases are covered by our 30-day return policy.

© 2026 NexAuto Technology Limited. All rights reserved.
Original Source: https://www.nex-auto.com/
Contact: sales@nex-auto.com | Phone: +86 153 9242 9628

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