1791-24B8 | Allen-Bradley 24-Input 8-Output Block I/O Module - Petro Auto Tech

Product Overview

The 1791-24B8 is a DC-powered block I/O module from the Allen-Bradley 1791 Block I/O series. It provides 24 input points and 8 output points, totaling 32 I/O points. This module operates on 24 Volts DC and is designed for reliable performance in industrial automation environments.

Technical Specifications Analysis

The 1791-24B8 features an input on-state voltage range of 10 to 30 Volts DC with an on-state current of 11mA at 30 Volts max. The input off-state voltage is 5 Volts DC max, and the off-state current is 1.5mA min. Outputs operate within a voltage range of 10 to 30 Volts DC. The module requires an external power supply of 19.2 to 30 Volts DC. It weighs 1.75 lbs (0.79 kg) and carries UPC 612598124794.

Application Scenarios & Usage Methods

This block I/O module suits discrete manufacturing lines, packaging machinery, and material handling systems. Use it to connect sensors and actuators directly to a PLC. The 24 inputs handle limit switches, proximity sensors, and pushbuttons. The 8 outputs control solenoids, indicator lights, or small relays. Install the module near the field devices to reduce wiring costs and simplify troubleshooting.

Installation Guide & Packing List

Mount the 1791-24B8 on a DIN rail or panel using the integrated slots. Connect the external power supply within 19.2 to 30 Volts DC. Wire inputs and outputs per the wiring diagram provided in the user manual. Ensure the module operates within 32 to 140 degrees Fahrenheit and 5 to 95% non-condensing relative humidity. The package includes one 1791-24B8 block I/O module and a quick-start guide.

Purchasing Advice

Verify your system voltage matches the 24 Volts DC nominal rating. Confirm the I/O count meets your application needs: 24 inputs and 8 outputs. Choose Petro Auto Tech for genuine Allen-Bradley products with fast shipping and expert support.

Repair & Maintenance Tips

Periodically inspect connections for tightness and signs of corrosion. Keep the module free of dust and moisture. Replace fuses only with the specified rating. Store the module in a clean, dry environment within the temperature and humidity ranges listed.

Frequently Asked Questions (FAQs)

Q: What is the input voltage range for the 1791-24B8?

A: The input on-state voltage range is 10 to 30 Volts DC.

Q: How many outputs does this module have?

A: It has 8 outputs per block, with an output voltage range of 10 to 30 Volts DC.

Q: What external power supply does the 1791-24B8 require?

A: It requires an external power supply of 19.2 to 30 Volts DC.

Q: What is the weight of the module?

A: The module weighs 1.75 lbs (0.79 kg).

Q: Is the module suitable for high-humidity environments?

A: Yes, it operates at 5 to 95% non-condensing relative humidity.