Allen-Bradley | 1791-N4V2 Analog I/O Module

Product Overview: Allen-Bradley 1791-N4V2 Analog Block I/O Module

Key Technical Specifications

• Brand: Allen-Bradley
• Model: 1791-N4V2
• Series: 1791 Block I/O
• Module Type: Combination Analog Input / Voltage Output Module
• Total Channels: 6 Points (4 Inputs, 2 Outputs)
• Analog Inputs: 4 Channels, Selectable Voltage or Current
• Analog Outputs: 2 Channels, Voltage Output
• Input Update Rate: 108 ms per channel
• Output Update Rate: 10 ms per channel
• Absolute Accuracy: 0.1% at 25°C
• Linearity: 0.05% at 25°C
• Common Mode Rejection: -75 dB
• Short Circuit Protection: Indefinite (Outputs)
• Output Impedance: Less than 1 Ohm
• Weight: 1.25 lbs (0.57 kg)

Analog Input Characteristics

• The four analog inputs are fully selectable per channel.
• You can configure each one independently for voltage or current signals.
• The module offers excellent noise immunity with -75 dB CMRR.
• It provides high-precision measurement with 0.1% absolute accuracy.
• The input update rate is 108 milliseconds for reliable data sampling.

Analog Output Characteristics

• The two analog outputs provide a stable voltage signal.
• Outputs update quickly, every 10 milliseconds per channel.
• They feature indefinite short-circuit protection for durability.
• This robust protection prevents damage from wiring errors or load faults.
• The low output impedance (<1 Ohm) ensures strong signal drive capability.

Installation & Network Configuration

• Mount the module on a standard DIN rail within your control panel.
• You must wire all Block I/O modules in a series on the RIO network.
• Never attempt to connect modules in a parallel wiring configuration.
• The total number of modules depends on system scan time and requirements.
• Install a terminating resistor on the last physical module in the series.
• Use an 82-Ohm terminator for networks not running at 230.4K baud.
• Proper termination ensures reliable communication and data integrity.

Frequently Asked Questions (FAQ)

• Q: Are the inputs on the 1791-N4V2 configurable?
  A: Yes, all four inputs are individually selectable for voltage or current.
• Q: What type of outputs does this module have?
  A: It has two analog voltage outputs with fast update rates.
• Q: Is there protection against wiring mistakes?
  A: Yes, the outputs have indefinite short-circuit protection.
• Q: What does the green LED indicate?
  A: A solid green LED shows the module is powered and communicating correctly.
• Q: Do you have this module in stock?
  A: Yes, we maintain stock of the original 1791-N4V2 for quick shipment.
• Q: What is your return policy?
  A: We offer a 30-day return guarantee on all our products.

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