Manufacturer	Rockwell Automation (Allen-Bradley)
Part Number	1791-32B0
Product Line	1791 Block I/O
Module Type	Discrete Input Block I/O
Nominal Voltage	24 VDC
Inputs per Block	32
Outputs per Block	0
Input Grouping	4 groups of 8 inputs
Input On-state Voltage Range	10-30 VDC
Input On-state Current	11 mA @ 30 V max.
Input Off-state Voltage	5 VDC max.
Input Off-state Current	1.5 mA min.
External Power Voltage	19.2-30 VDC
External Power Current	300 mA
Dimensions	6.95 x 4.35 x 3.85 in.
Weight	1.81 lbs (0.82 kg)
Mounting	DIN Rail
Isolation	500 VAC
Maximum Power Dissipation	16.3 W
Thermal Dissipation	55.6 BTU/hour
Input Impedance	3.4 kΩ max.
Compatible Controllers	PLC-2, PLC-3, PLC-5/250, PLC-5, SLC 5/02
Lifecycle Status	Discontinued/Obsolete

What is the part number 1791-32B0?

The 1791-32B0 is a discontinued 24V dc discrete block I/O module manufactured by Allen-Bradley (Rockwell Automation). It provides 32 input channels and 0 output channels, arranged in four groups of eight inputs each.

What are the electrical specifications for the 1791-32B0 inputs?

The module has a nominal voltage rating of 24V dc. The input on-state voltage range is 10-30V dc, with an on-state current of 11mA at 30V max. The input off-state voltage is 5V dc max, and the off-state current is 1.5mA min.

What external power supply is required for the 1791-32B0?

The module requires an external power supply of 19.2-30V dc. The maximum power dissipation is 16.3 Watts, and the thermal dissipation is 55.6 BTU/hour.

Which programmable controllers are compatible with the 1791-32B0?

The 1791-32B0 is compatible with PLC-2, PLC-3, PLC-5/250, and PLC-5 programmable controllers, as well as SLC 5/02 modular controllers.

What are the physical dimensions and mounting options for the 1791-32B0?

The module measures 6.95 x 4.35 x 3.85 inches and weighs 1.81 lbs (0.82 kg). It can be mounted on a DIN rail and features removable terminal strips on the left and right sides for input, output, remote I/O, and power connections.

What is the current lifecycle status of the 1791-32B0?

The 1791-32B0 is discontinued/obsolete by the manufacturer. Alternate part numbers listed in the reference include 1791-3280 and 1791-32BO.

Does the Allen-Bradley 1791-32B0 come with a warranty?

Yes. The 1791-32B0 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 1791-32B0 a genuine Allen-Bradley part?

The 1791-32B0 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 1791-32B0 new or used?

We offer the 1791-32B0 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 1791-32B0?

The 1791-32B0 runs on 24 VDC.

What is the Allen-Bradley 1791-32B0?

The 1791-32B0 is an Allen-Bradley Block I/O Discrete Input Block I/O.

Allen-Bradley

1791-32B0

Rate this product

PLCs Block I/O

The Allen-Bradley 1791-32B0 PLC, by Rockwell Automation, is a discontinued 24V dc block I/O module providing 32 inputs with an on-state voltage range of 10-30V dc, ensuring reliable data acquisition in automation systems. Compact dimensions (6.95 x 4.35 x 3.85 in.) facilitate its integration into existing setups.

PDF

We currently only collect tax from customers in the state of North Carolina. If you are exempt on your purchase, please email your Sales Tax & Use Exemption Form to sales@replacenc.com.
If you are checking out via a quote we send you, there is an option to upload your form at the time of purchase.

If you have already placed an order, please send us your form and we can refund the charged taxes.

Overview of Allen-Bradley 1791-32B0

The Allen-Bradley 1791-32B0 is a discrete block I/O module from the 1791 series, designed for remote data acquisition in automation systems. This module provides 32 input channels and 0 output channels, operating at a nominal voltage of 24V dc. It is a self-contained remote I/O device that includes power supply, programmable controller interface, input/output connections, and signal conditioning circuitry.

Currently listed as discontinued or obsolete by the manufacturer, the 1791-32B0 remains a critical component for maintaining legacy control systems. The module is available in Series A and Series B revisions, with the part number 1791-32B0/B specifically denoting the Series B version.

Key Features

This module features 32 input channels arranged in four groups of eight inputs each. It utilizes removable terminal strips on the left and right sides for input, remote I/O, and power connections, facilitating easy wiring and maintenance. The design includes two switch assemblies for setting the I/O rack number, communication rate, starting I/O group, last state, and last chassis.

Status indicators are present to monitor the status of inputs, outputs, and communication. The module supports a maximum input impedance of 3.4K Ω and provides isolation of 500 Volts AC for power supply to remote I/O, I/O group-to-group, and I/O group-to-logic.

Performance and Capacity

The 1791-32B0 operates with an input on-state voltage range of 10-30V dc and an input off-state voltage maximum of 5V dc. The rated input on-state current is 11mA at 30V dc maximum, with a minimum of 2.5mA at 10V. The off-state current is a minimum of 1.5mA. External power requirements are 19.2-30V dc with a current draw of 300mA.

Thermal performance is characterized by a maximum power dissipation of 16.3 Watts and a thermal dissipation of 55.6 BTU/hour. The module weighs 1.81 lbs (0.82 kg) and measures 6.95 x 4.35 x 3.85 inches.

Installation and Compatibility

The 1791-32B0 is designed for DIN rail mounting, allowing for compact integration into existing control panels. For wiring, compatible cables include Belden 9463 for the remote I/O link and 14 AWG stranded wire with 3/64-inch insulation for input and output connections. The module is compatible with PLC-2, PLC-3, PLC-5/250, and PLC-5 programmable controllers, as well as SLC 5/02 modular controllers.

When connecting to 1771 series output modules, compatibility is ensured if the module's off-state leakage current is less than the minimum off-state current of the block module and the minimum on-state voltage of the DC block input exceeds the supply voltage minus the on-state voltage drop across the 1771 output module. It is also compatible with pure coil 100-A45 contactors and Type F, Type P, and Type PH relays.

Applications and Industries

As a 24V dc input module, the 1791-32B0 is suitable for applications requiring reliable data acquisition from discrete sensors and switches in industrial automation environments. Its ability to handle 32 inputs makes it ideal for monitoring multiple status signals in manufacturing, process control, and machine control systems.

The module's robust isolation and defined voltage ranges ensure stable operation in environments where electrical noise or varying supply voltages may be present, supporting the continued functionality of legacy Allen-Bradley control systems.