Manufacturer	Allen-Bradley
Product Line	1791 Block I/O
Module Type	Discrete Input module
Number of Inputs	32
Number of Input Groups	4
Channels per Group	8
Nominal Input Voltage	120 VAC
Input On-state Voltage Range	79-132 VAC, 47-63 Hz
Input On-state Current	12.3 mA @ 132 V max
Input Off-state Voltage	35 V max
Input Off-state Current	2.3 mA min
Nominal Input Current	11 mA
Number of Outputs	0
Communication Protocol	Remote I/O (RIO)
External Supply Voltage	85-132 VAC, 47-63 Hz
External Supply Current	150 mA
Power Dissipation	13.62 W
Thermal Dissipation	46.44 BTU/hr
Dimensions	6.95 x 4.35 x 3.85 in
Weight	2.31 lbs (1.05 kg)
Operating Temperature	0-60 °C
Storage Temperature	-40-85 °C
Relative Humidity	5-95%, non-condensing
Isolation (I/O Group to Group)	1250 VAC
Isolation (I/O Group to Logic)	1250 VAC
Isolation (Power Supply to RIO Port)	500 VAC
Input Impedance	15 kΩ at 60 Hz
Switching Delay (Off to On)	1.0 ms
Switching Delay (On to Off)	26 ms max
Recommended Wire Size	14 gauge stranded
Maximum Insulation Thickness	3/64 in
Product Lifecycle Status	Discontinued/Obsolete

What is the part number 1791-32A0 and what is its primary function?

The 1791-32A0 is a discontinued Allen-Bradley 1791 Block I/O module. It is a discrete input module featuring 32 AC input channels, organized into four groups of eight channels each, designed for use in distributed I/O architectures.

What is the supported communication protocol for the 1791-32A0?

The 1791-32A0 supports the Remote I/O (RIO) communication protocol, allowing it to function as a stand-alone remote I/O device with a programmable controller interface.

What are the power requirements for the 1791-32A0?

The module requires an external power supply of 85-132V AC at 47-63 Hz. The external supply current requirement is 150 mA.

What are the input voltage and current specifications for the 1791-32A0?

The module operates at a nominal input voltage of 120V AC. The on-state voltage range is 79-132V AC at 47-63 Hz. The on-state current is a maximum of 12.3 mA at 132V AC, and the off-state voltage is a maximum of 35V.

Does the 1791-32A0 have any output channels?

No, the 1791-32A0 is an input-only module. It contains 32 input channels and 0 output channels.

What are the physical dimensions and weight of the 1791-32A0?

The module measures 6.95 x 4.35 x 3.85 inches. The weight is approximately 2.31 lbs (1.05 kg) according to one source, or 2.01 lbs according to another.

What is the current lifecycle status of the 1791-32A0?

The 1791-32A0 is discontinued/obsolete by the manufacturer.

Does the Allen-Bradley 1791-32A0 come with a warranty?

Yes. The 1791-32A0 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 1791-32A0 a genuine Allen-Bradley part?

The 1791-32A0 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 1791-32A0 new or used?

We offer the 1791-32A0 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 1791-32A0?

The 1791-32A0 runs on 120 VAC, draws 11 mA, and communicates over Remote I/O (RIO).

What is the Allen-Bradley 1791-32A0?

The 1791-32A0 is an Allen-Bradley Block I/O Discrete Input module.

Allen-Bradley

1791-32A0

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PLCs Block I/O

The Allen-Bradley 1791-32A0 is a discontinued Rockwell Automation Block I/O module with 32 AC inputs, accommodating 79-132V with an on-state current of 12.3mA max. It requires an external power supply of 85-132V AC and measures 6.95 x 4.35 x 3.85 inches, designed for efficient space utilization in industrial settings.

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Overview of Allen-Bradley 1791-32A0

The Allen-Bradley 1791-32A0 is a discontinued discrete input module from the 1791 Block I/O series, designed for distributed I/O applications in industrial automation. This stand-alone module features 32 AC input channels and supports the Remote I/O (RIO) communication protocol, allowing it to interface with programmable controllers in a distributed architecture.

As a block I/O device, the 1791-32A0 includes its own power supply, controller interface, and signal conditioning circuitry, eliminating the need for a separate chassis or power supply unit for basic operation. It is specifically configured for 120V AC input signals, making it suitable for applications involving AC voltage sensing and control.

Key Features

This module provides 32 discrete AC input channels, organized into four groups of eight channels each. It supports the Remote I/O (RIO) communication protocol, facilitating integration into distributed control systems. The module is designed for DIN rail mounting and utilizes screw terminals for wiring connections.

The 1791-32A0 features robust isolation ratings, including 1250 VAC for I/O group-to-group and I/O group-to-logic isolation, and 500 VAC for power supply to RIO port isolation. It is a dedicated input module with no output channels, focusing solely on signal acquisition.

Performance and Capacity

The module operates with a nominal input voltage of 120V AC, with an on-state voltage range of 79-132V AC at 47-63 Hz. The on-state current is a maximum of 12.3 mA at 132V AC, while the off-state voltage is a maximum of 35V. The off-state current is a minimum of 2.3 mA at 60 Hz.

Switching delays are specified as 1.0 ms for the off-to-on transition and a maximum of 26 ms for the on-to-off transition. The module has an input impedance of 15 kΩ at 60 Hz. Power dissipation is 13.62 Watts, with a thermal dissipation of 46.44 BTU/hr. The external power requirement is 85-132V AC at 47-63 Hz with a current draw of 150 mA.

Installation and Compatibility

The 1791-32A0 is designed for DIN rail mounting, offering a compact footprint of 6.95 x 4.35 x 3.85 inches. It requires an external power supply of 85-132V AC, 47-63 Hz. For wiring connections, the manufacturer recommends using 14-gauge stranded wire with a maximum insulation thickness of 3/64 inch.

The module operates within a temperature range of 0 to 60 degrees Celsius and a relative humidity of 5-95% non-condensing. Storage temperatures range from -40 to 85 degrees Celsius. It is compatible with Allen-Bradley programmable controllers that support the Remote I/O (RIO) protocol.

Applications and Industries

The 1791-32A0 is suitable for industrial applications requiring the monitoring of 32 AC voltage signals. It is commonly used in manufacturing, process control, and machinery control systems where distributed I/O is preferred to reduce wiring complexity and improve system scalability.

Industries such as automotive, food and beverage, and general manufacturing may utilize this module for monitoring AC-powered equipment, motor controls, and other AC-based sensors or actuators within their automation infrastructure.