Allen-Bradley 1791-32A0
Allen-Bradley 1791-32A0
Allen-Bradley 1791-32A0
Allen-Bradley 1791-32A0
Allen-Bradley 1791-32A0
Allen-Bradley 1791-32A0
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  • Lifecycle status

    Discontinued / Obsolete by OEM
    Apter Power offers a reliable replacement inventory for obsolete Allen Bradley 1791-32A0 modules, providing high-density 120V signal monitoring for legacy industrial systems.

1791-32A0

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The 1791-32A0 supports remote I/O (RIO) communication protocols and supports DIN rail or panel mounting.
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Technical specifications for 1791-32A0

  • Manufacturer:
    Allen-Bradley
  • Part Number:
    1791-32A0
  • Product Family:
    1791 Block I/O
  • Product Type:
    32 Input AC Block I/O Module
  • Stock:
    1
  • Power supply to RIO:
    500V ac
  • I/O Group-to-Group:
    1250V ac
  • I/O Group-to-Logic:
    1250V ac
  • Power Dissipation Maximum:
    13.62 Watts
  • Thermal Dissipation Maximum:
    46.44 BTU/hr
  • Weight:
    0.85 kg
  • Estimated shipping dimensions:
    17.5x11.2x9.5cm
  • Tariff Code:
    8537101190
  • Country of origin:
    USA
  • Place of shipment:
    Xiamen,Fujian,China
By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

More Information

Overview Manuals Specifications Use Cases Firmware & Updates Environmental Ratings

Features:

  • Interface Between 120VAC Field Input Signals and Remote I/O Communication Network
  • Combines Capability of 32-Channel AC Input Acquisition with Stand-Alone Block I/O Architecture
  • Operates in Conjunction with PLC-2, PLC-3, PLC-5/250, PLC-5 Family and SLC 5/02 Modular Controllers
The Allen-Bradley 1791-32A0 T32 Input AC Block I/O Module operates as a stand-alone remote I/O station in industrial control systems, providing reliable interface between field AC input devices and the programmable controller. It continuously processes 32 channels of 120VAC input signals (79-132VAC, 47-63Hz) and communicates status data through the Remote I/O (RIO) network to support real-time monitoring and control of all connected field devices. Seamless integration is standard with the 1791-32A0 T32 Input AC Block I/O Module, however using proper RIO network configuration will allow seamless communication with multiple controllers in the event of a primary communication path interruption. The 1791-32A0 T32 Input AC Block I/O Module has made improvements in several areas over previous block I/O designs in addition to incorporating universal 79-132VAC input voltage capability within the 32-channel architecture.

The 1791-32A0 T32 Input AC Block I/O Module provides essential input acquisition functions common to the entire control system, and is a critical component of the I/O path, directly affecting the proper, normal operation of the overall monitoring and control system. One or more 1791-32A0 T32 Input AC Block I/O Module units are required per system depending on the desired I/O channel count. The 1791-32A0 T32 Input AC Block I/O Module occupies a compact enclosure measuring 6.95 x 4.35 x 3.85 inches and can be mounted using DIN rail or panel mounting options.

For expanded I/O applications, the control system requires additional 1791-32A0 T32 Input AC Block I/O Module units installed in remote locations. In addition to standard single module operation, the distributed configuration also performs automatic communication handshaking. The RIO network configuration executes data exchange using the internal communication protocol specified in the 1791-32A0 T32 Input AC Block I/O Module options. Using this method, the remote I/O system continually monitors the health of all connected 1791-32A0 T32 Input AC Block I/O Module units. If the system detects that a primary 1791-32A0 T32 Input AC Block I/O Module is no longer providing valid input signals (outside configured voltage/current tolerance levels), it will automatically flag the status indicators and report the event through the RIO communication port.

The 1791-32A0 Allen Bradley 32 Input AC Block I/O Module may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL) by the manufacturer (OEM).
Allen Bradley 1791-32A0 32 Input AC Block I/O Module Manuals,Datasheets,Link Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
Allen Bradley 1791-32A0 32 Input AC Block I/O Module

General

  • Manufacturer Allen-Bradley
  • Model 1791-32A0
  • Condition New Original ready stock
  • Product Family 1791-0A32,1791-16AC,1791-8AR
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
  • Material Handling: Monitoring conveyors, sorting gates, and motor starters.
  • Packaging Systems: Interfacing with high volumes of limit switches and proximity sensors.
  • Operator Panels: Connecting pushbuttons, selector switches, and pilot lights on human-machine interface panels.
  • Distributed Architecture: Implementing I/O for systems using PLC-2, PLC-3, PLC-5, or SLC 5/02 controllers over Remote I/O (RIO) links.
  • Hardware Revisions: It is commonly found as Series B, which includes hardware-level improvements over original Series A modules.
  • Firmware Access: Because it is a legacy hardware block, firmware is typically factory-installed and not user-flashable in the field. Users requiring specific firmware revisions usually need to source refurbished units with the desired version already loaded.
  • Operating Temperature: 0°C to 60°C (32°F to 140°F).
  • Storage Temperature: -40°C to 85°C (-40°F to 185°F).
  • Relative Humidity: 5% to 95% (non-condensing).
  • Heat Dissipation: 13.62 Watts / 46.44 BTU/hr (Maximum).
  • Cooling Requirements: Minimum 2-inch (50.8 mm) clearance on all sides for natural convection.
  • Vibration/Shock: Designed to meet standard industrial specifications for cabinet-mounted equipment.
Description
The Allen Bradley 1791-32A0 is a 120V AC I/O module with 32 inputs and 0 outputs, designed to optimize connectivity for industrial automation. This 1791-32A0 module can handle complex logic wiring environments by integrating signals from multiple field devices into a compact module. It directly solves the problems of signal clutter and excessive wiring paths in high-density installations, successfully addressing the challenges of limited panel space and difficult troubleshooting. This 1791-32A0 input module is widely used in heavy industrial manufacturing, wastewater treatment, material handling systems, and food processing facilities, where reliable AC signal monitoring from field devices is crucial for operational safety.

In terms of product compatibility and practical applications, the 1791-32A0 module can be used with AC limit switches, selector switches, float switches, proximity switches, and push-button switches. For example, the Allen Bradley 1791-32A0 can be used for multiphase conveyor control or tank level monitoring systems. It solves the problem of unstable signal reading from harsh mechanical components by providing stable logic-side filtering for industrial switches. Deploying the 1791-32A0 in these systems allows factories to safely monitor liquid levels via float switches or track material paths using proximity and limit switches, ensuring precise feedback loops for automated machinery.

For installation and integration, the 1791-32A0 can be installed vertically (highly recommended) or horizontally depending on your panel layout. To ensure proper integration, users need to leave sufficient space around the module to allow cooling airflow and prevent overheating and frequency throttling. The system connectivity of this input module is highly flexible; you can directly drive the terminals on the 1791-32A0 input module using the outputs of the 1791-OA32 or 1791-16AC modules. Diagnostic integration is achieved through the front panel, which includes 32 input status indicators, one communication indicator, and one status indicator. The 1791-32A0 input status indicator lights up when the corresponding input circuit applies voltage to provide logic-side tracking; the communication indicator lights up when communication is established; and the status indicator lights up when a hardware or software error occurs.

Revisions

Revision Part #

Also known as

1791-32A0 Ser A
1791-32A0/A, Series A, Rev A
1791-32A0 Ser B
1791-32A0/B, Series B, Rev B
Alternative Names
1791-32AO 179132A0 179132AO 179I-32A0 179I32A0 I791-32A0
Technical notes
The 1791-32A0 comes with a single Remote I/O (RIO) communication port with isolation rating of 1250 VAC for I/O group to group isolation and 1250 VAC I/O group to logic isolation. Additionally, the Power supply to RIO port isolation is 500 VAC.
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FAQS

The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
What is the supported protocol of the 1791-32A0?
The 1791-32A0 supports RIO communication protocol.
Does the 1791-32A0 require an external power to operate?
Yes. It requires 85-132VAC, 47-63 Hz with current of 150 mA.
Does the module come with discrete output channels?
No. The 1791-32A0 only has input channels.

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