Allen-Bradley 1791-24AR Block I/O 24 Inputs 8 Outputs

Allen-Bradley 1791-24AR Block I/O Module

Product Overview

This AC block I/O module provides 24 inputs and 8 relay outputs. It operates on 120V ac nominal input. The inputs group into three banks of eight. Outputs use normally-open electromechanical relays. Output voltage depends on the load type and current.

Oiltech Controls’s Insight

• We tested this module on conveyor systems and packaging lines.
• It handles mixed AC/DC loads with relay outputs.
• Inputs respond reliably to 79-132V ac signals.
• Output current derates for inductive loads.

Key Technical Specifications

• Manufacturer: Allen-Bradley
• Part Number: 1791-24AR
• Product Line: 1791 Block I/O
• Category: PLCs
• Inputs per Block: 24 (3 groups of 8)
• Input On-state Voltage: 79-132V ac
• Input On-state Current: 12.3mA max @ 132V
• Input Off-state Voltage: 35V max
• Input Off-state Current: 2.3mA min
• Outputs per Block: 8 (relay, normally open)
• Output Voltage Range: 20-132V ac @ 1A resistive; 20-30V dc @ 1A
• External Power: 85-132V ac
• Dimensions: 3.85 x 4.35 x 6.95 in
• Weight: 2.50 lbs (1.13 kg)
• UPC: 612598124763

Output Current Details

• Resistive Load: 1A at 20-132V ac; 1A at 20-30V dc
• Inductive Load: 0.5A at 20-132V ac (cos phi = 0.4)
• DC Inductive Load: 1A at 20-30V dc (L/R = 7ms)
• High DC Voltage: 0.1A at 125V dc steady
• Note: Lower current allows higher output voltage.

Compatible Equipment

• Allen-Bradley PLC-5 and SLC 500 systems
• Conveyor and material handling controls
• Packaging machinery with AC solenoids
• HVAC control panels
• Industrial lighting and alarm systems

Installation & Setup

• Mount on DIN rail or panel.
• Connect 85-132V ac external power.
• Wire inputs to field devices (79-132V ac).
• Connect relay outputs to loads (20-132V ac or 20-30V dc).
• Check wiring diagrams for group isolation.

Debugging & Maintenance

• Check LED indicators for input and output status.
• Test relay contacts with a multimeter.
• Inspect wiring for loose connections.
• Replace module if inputs fail to read.

Package & Warranty

• Includes: 1 module, terminal block, quick guide.
• 12-month warranty on parts and labor.
• Excludes misuse or over-current damage.

Shipping & Delivery

• Shipped via FedEx, UPS, or DHL.
• 24-28 hours dispatch after order.
• Tracking provided within 24 hours.

Why Buy From Oiltech Controls?

• 15+ years in industrial automation spares.
• Global shipping with reliable carriers.
• Tested surplus and refurbished options.
• 12-month warranty on every product.
• Technical verification before shipment.
• Expert support for obsolete control systems.

Frequently Asked Questions (FAQ)

Q1: Can outputs switch DC loads?

Yes, up to 30V dc at 1A. Higher DC voltage lowers current rating.

Q2: What is the maximum inductive load current?

At 120V ac with cos phi = 0.4, limit to 0.5A per output.

Q3: Can I mix AC and DC on the same output?

Each relay can switch AC or DC independently.

Q4: How do I connect input groups?

Inputs are arranged in three groups of eight, each with common.

Q5: Is this module compatible with 24V dc systems?

No, it requires 79-132V ac input signals.

Contact Information

Inquiries: info@oiltechcontrols.com
WhatsApp: +86 158 8020 0923

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