Allen-Bradley 1791-24B8 Block I/O Module: 24 Inputs, 8 Outputs

Product Introduction

When a production line demands robust and compact I/O handling, the Allen-Bradley 1791-24B8 block I/O module delivers. This module from the 1791 Block I/O series provides 24 input points and 8 output points, all in a single, space-saving enclosure. As a DC-powered unit, it operates efficiently in environments where reliable signal processing is critical. Maintenance engineers appreciate its straightforward design, which simplifies troubleshooting and reduces downtime.

Technical Specifications Breakdown

The 1791-24B8 operates on a 24 Volts DC supply, with an input on-state voltage range of 10 to 30 Volts DC and an input on-state current of 11mA at 30 Volts max. The input off-state voltage is 5 Volts DC max, with an off-state current of 1.5mA min. Outputs handle 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 measures 176.5 mm x 68.8 mm x 98 mm. These parameters ensure consistent performance in typical industrial control applications.

Industry Applications

In manufacturing facilities, the 1791-24B8 excels at monitoring sensor inputs and controlling actuators. For example, in a packaging line, its 24 inputs can track product presence and position, while the 8 outputs drive solenoids or indicators. The module's DC voltage range makes it compatible with many proximity sensors and limit switches. Maintenance teams find its block design easy to replace, minimizing production interruptions.

Installation & Setup Guidance

Mount the 1791-24B8 securely on a DIN rail or panel using the provided slots. Ensure the external power supply delivers 19.2 to 30 Volts DC to the module. Connect input devices to the 24 input terminals, grouping them as needed for your application. For outputs, wire actuators or relays to the 8 output points. Always verify polarity and voltage levels before powering up. Refer to the user manual for detailed wiring diagrams and configuration steps.

Maintenance & Reliability

To maintain reliability, inspect the 1791-24B8 periodically for signs of dust or moisture. The module operates in temperatures from 32 to 140 degrees Fahrenheit and 5 to 95% non-condensing humidity. Check connections and power supply stability during routine maintenance. Its solid-state design reduces wear, but regular testing of input and output circuits helps catch issues early. Following these practices extends service life and reduces unplanned downtime.

Selection Guide & Purchasing Advice

When selecting the 1791-24B8, verify that your system requires 24 DC inputs and 8 DC outputs within the specified voltage range. Confirm compatibility with your controller and power supply. BluePLC Industrial offers this module with reliable availability and support. Contact us to confirm lifecycle status and current stock. We help you find the right solution for your automation needs.