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

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.

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