Manufacturer	Rockwell Automation (Allen-Bradley)
Product Line	1791 Block I/O
Part Number	1791-24BR
Module Type	24 input, 8 relay output dc block I/O module
Operating Voltage	24V dc
External Power Voltage	19.2-30V dc
External Power Current	300 mA
Inputs per Block	24
Input On-state Voltage Range	10-30V dc
Input On-state Current	11mA @ 30V max.
Input Off-state Voltage	5V dc max.
Input Off-state Current	1.5mA min.
Outputs per Block	8
Output Voltage Range	20-132V ac @ 1A resistive max.
Dimensions	6.95 x 4.35 x 3.85 in.
Weight	1.75 lbs (0.79 kg)
Maximum Power Dissipation	14.5 Watts
Maximum Thermal Dissipation	49.4 BTU/hour
Isolation Voltage	500 Volts AC
Operating Temperature	0-60 degrees Celsius
Storage Temperature	40-85 degrees Celsius
Relative Humidity	5-95% non-condensing
Compatible Controllers	PLC-2, PLC-3, PLC-5/250, PLC-5 family, SLC 5/02
Product Lifecycle Status	Discontinued/Obsolete

What are the input and output specifications for the Allen-Bradley 1791-24BR?

The 1791-24BR is a mixed I/O module featuring 24 DC inputs and 8 relay outputs. The inputs operate with an on-state voltage range of 10-30V dc and an off-state voltage maximum of 5V dc. The outputs are rated for 20-132V ac with a maximum resistive load of 1A.

What external power supply is required for the 1791-24BR module?

The module requires an external power supply of 19.2-30V dc. The maximum power dissipation is 14.5 Watts, and the maximum thermal dissipation is 49.4 BTU/hour.

Which programmable controllers are compatible with the 1791-24BR?

The 1791-24BR is compatible with PLC-2, PLC-3, PLC-5/250, and PLC-5 family programmable controllers, as well as SLC 5/02 modular controllers.

What are the physical dimensions and mounting requirements for the 1791-24BR?

The module measures 6.95 x 4.35 x 3.85 inches and weighs approximately 1.75 lbs (0.79 kg). It is designed to be mounted on a DIN rail, with a recommendation for vertical mounting.

What is the current lifecycle status of the 1791-24BR?

The 1791-24BR is a discontinued/obsolete part. It was discontinued by the manufacturer on June 30, 2015.

What isolation and environmental specifications does the 1791-24BR support?

The module features 500V AC isolation for the power supply to remote I/O, I/O group-to-group, and I/O group-to-logic. It supports an operating temperature range of 0-60 degrees Celsius, a storage temperature range of -40 to 85 degrees Celsius, and a non-condensing relative humidity of 5-95%.

Does the Allen-Bradley 1791-24BR come with a warranty?

Yes. The 1791-24BR is backed by our 24-Month Replace Industrial Warranty, with no rush fees or hidden warranty charges. If a unit fails under normal use within the warranty period, we repair or replace it.

Is this 1791-24BR a genuine Allen-Bradley part?

The 1791-24BR is sourced and verified independently. Replace Industrial, LLC is not a Rockwell Automation Authorized Distributor, and all warranties are provided directly by Replace Industrial.

Is the Allen-Bradley 1791-24BR new or used?

We offer the 1791-24BR in multiple conditions, from unused surplus to professionally reconditioned units. Every option is sourced and verified independently and covered by our 2-year replacement warranty.

What are the key ratings of the 1791-24BR?

The 1791-24BR runs on 24V dc and operates across 0-60 degrees Celsius.

What is the Allen-Bradley 1791-24BR?

The 1791-24BR is an Allen-Bradley Block I/O 24 input, 8 relay output dc block I/O module.

Allen-Bradley

1791-24BR

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PLCs Block I/O

The Allen-Bradley 1791-24BR is a discontinued Block I/O module from Rockwell Automation featuring 24 DC inputs and 8 AC outputs. Operating on a 24V dc voltage, it offers on-state input ranges from 10 to 30V dc and handles output voltages between 20-132V ac with a maximum of 1A resistive load. The compact design measures 6.95 x 4.35 x 3.85 inches.

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Overview of Allen-Bradley 1791-24BR

The Allen-Bradley 1791-24BR is a discontinued Block I/O module from Rockwell Automation, designed for use in the 1791 Discrete Block I/O series. This self-contained remote I/O device integrates a power supply, programmable controller interface, input/output connections, and signal conditioning circuitry into a compact unit. It is currently listed as obsolete by the manufacturer.

Key Features

This module features a mixed I/O configuration with 24 DC inputs and 8 relay outputs. The inputs are organized into three groups of eight, while the outputs are relay-based, allowing for flexible control of various loads. The unit includes status indicators to monitor communication and I/O states, as well as switch assemblies for configuring the I/O rack number, communication rate, and starting I/O group.

Performance and Capacity

The 1791-24BR operates on a 24V DC supply, with an external power requirement of 19.2-30V DC at 300 mA. The 24 DC inputs have an on-state voltage range of 10-30V DC and an off-state voltage maximum of 5V DC. The 8 relay outputs support a voltage range of 20-132V AC with a maximum resistive load of 1A. The module has a maximum power dissipation of 14.5 Watts and a thermal dissipation of 49.4 BTU/hour, with an isolation rating of 500V AC between the power supply, remote I/O, and I/O groups.

Installation and Compatibility

Measuring 6.95 x 4.35 x 3.85 inches and weighing approximately 1.75 lbs, the module is designed for DIN rail mounting, with a recommendation for vertical installation. It is compatible with PLC-2, PLC-3, PLC-5/250, and PLC-5 family programmable controllers, as well as SLC 5/02 modular controllers. Terminal strips on the left and right sides accommodate remote I/O link, input/output connections, and power.

Applications and Industries

As a discrete Block I/O module, the 1791-24BR is suitable for industrial automation applications requiring remote I/O expansion for legacy Allen-Bradley PLC systems. It is commonly used in machine control and process automation environments where 24V DC input sensing and relay output control are required for discrete devices.