Allen-Bradley 1791-24BR: The Smart I/O Module for Your Machine

Key Features & Top Specifications

• Brand & Model: Allen-Bradley 1791-24BR
• Input Channels: 24 DC inputs (in 3 groups of 8).
• Input Voltage: 10 to 30 Volts DC operating range.
• Output Channels: 8 relay outputs (electromechanical).
• Relay Contact Rating: 1 Amp resistive at 20-132V AC.
• Module Power: 19.2-30V DC external supply (300 mA).
• Isolation Rating: 500V AC protection between groups.

Reliable Performance Data

• Input ON Current: 11 mA maximum at 30V DC.
• Input OFF Current: 1.5 mA minimum.
• Power Dissipation: 14.5 Watts maximum.
• Thermal Dissipation: 49.4 BTU/hour maximum.
• Operating Temperature: 0°C to 60°C (32°F to 140°F).
• Storage Temperature: -40°C to 85°C.
• Relative Humidity: 5% to 95%, non-condensing.

Easy Setup & Installation

• Mounting: Vertical DIN rail mount is best for cooling.
• Dimensions: Compact 6.95" x 4.35" x 3.85" size.
• Weight: Light at 2.38 lbs (1.08 kg).
• Wiring: Removable terminal strips on both sides.
• Configuration: Two DIP switches set rack number and speed.
• Status Lights: LEDs show communication and I/O state.

System Compatibility & Use

• Works With: PLC-2, PLC-3, PLC-5, and SLC 5/02 controllers.
• Communication: Built-in Remote I/O (RIO) network interface.
• Best For: Distributing I/O close to machines and sensors.
• Benefits: Reduces long wire runs and saves installation cost.

What's in the Box? (Packaging List)

• One Allen-Bradley 1791-24BR Block I/O Module.
• Factory documentation and installation guide.

Shipping & Service Info

• Fast Shipping: We ship worldwide via FedEx, UPS, and DHL.
• Warranty: All products come with a 12-month warranty.
• Support: Our experts provide technical support.

Expert FAQ (Frequently Asked Questions)

• What can the relay outputs on the 1791-24BR switch? They can switch AC or DC loads. Examples are lights, small motors, and solenoids.
• How do I set the module's address on the RIO network? Use the two DIP switches on the module to set the rack number.
• Can I mount this module horizontally? We recommend vertical mounting for best heat dissipation and performance.
• What is the isolation voltage for safety? It has 500V AC of isolation between I/O groups and power.
• Does this module need a special communication cable? Use a standard Belden 9463 or similar shielded cable for the RIO link.

© 2025 Ubest Automation Limited. https://www.ubestplc.com/ All rights reserved.
Author: Ubest Automation
Contact: Email: sales@ubestplc.com Phone: +86 180 3000 5825