Allen-Bradley 1791-OB32
Allen-Bradley 1791-OB32
Allen-Bradley 1791-OB32
Allen-Bradley 1791-OB32
Allen-Bradley 1791-OB32
Allen-Bradley 1791-OB32
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1791-OB32

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The Allen-Bradley 1791-OB32 Discrete DC I/O Module is a comprehensive remote I/O solution that integrates all key components into a compact unit.
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Technical specifications for 1791-OB32

  • Manufacturer:
    Allen-Bradley
  • Part Number:
    1791-OB32
  • Product Family:
    1791 Block I/O
  • Outputs per Block:
    32
  • Output Voltage Range:
    10-30V dc
  • External Power:
    19.2-30V dc
  • Min. On-state Current:
    1mA per output
  • Max. On-state Voltage Drop:
    1V @ rated current
  • Output Signal Delay:
    0.5ms on; 1.0ms off (max.)
  • Weight:
    0.78 kg
  • Estimated shipping dimensions:
    18x12.6x9.6cm
  • 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 Monitoring & Control Temperature & Humidity Range

Features:

  • Remote I/O Interface for PLC-2, PLC-3, PLC-5/250, PLC-5, and SLC 5/02 Controllers
  • Integrates Programmable Controller Interface, Power Supply, I/O Connections, and Signal Generation in One Block
  • Functions as a Cost-Effective Distributed I/O Solution for Packaging, Material Handling, and Operator Interface Applications
The Allen-Bradley 1791-OB32 serves as a 32-point discrete DC block I/O module, delivering 24V DC output capability to field devices across industrial automation systems. It continuously processes output signals through 32 discrete channels, providing 500mA per output at 60°C for vertical mounting or 250mA per output at 60°C for horizontal mounting, with signal delays of just 0.5ms at turn-on and 1.0ms at turn-off. Seamless communication is standard with the 1791-OB32 through Universal Remote I/O protocol, while removable terminal strips eliminate rewiring requirements during module replacement or maintenance activities.

The 1791-OB32 provides essential I/O functions for distributed control architectures, serving as a critical component of the remote I/O path that directly affects the proper, normal operation of packaging lines, conveyor systems, and machine control panels. One 1791-OB32 module supports 32 discrete outputs and requires 300mA current at 24V DC nominal voltage. The 1791-OB32 occupies minimal enclosure space and can be mounted in vertical or horizontal orientations depending on thermal management requirements and output current derating needs.

For high-density output applications, the 1791-OB32 delivers reliable switching with a maximum On-state voltage drop of 1V at rated current and maximum Off-state leakage current of 0.5mA. In addition to standard output operation, the module provides comprehensive status indication. The 1791-OB32 monitoring system continually tracks communication health, module status, and individual I/O states through 1 COMM indicator, 1 STATUS indicator, and 16 I/O Status indicators. Using this method, maintenance personnel can quickly identify fault conditions without specialized diagnostic equipment. If the system detects communication errors or output faults, the LED indicators provide immediate visual feedback for streamlined troubleshooting procedures.

The 1791-OB32 Allen-Bradley Discrete 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-OB32 Discrete 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-OB32 Discrete Block I/O Module Specs

General

  • Manufacturer Allen-Bradley
  • Model 1791-OB32
  • Condition New Original ready stock
  • Product Family 1791-OB32P,1791-OA32,1791-0B32
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.
  • Switching Discrete Loads: Activating 24V DC field devices such as solenoids, pilot lights, and relay coils.
  • Remote Machine Control: Placing I/O closer to sensors and actuators to reduce wiring and installation time.
  • Legacy System Integration: Compatibility with older controllers like the PLC-2, PLC-3, PLC-5, and SLC 5/02 systems.
  • Panel Space Optimization: Its compact, self-contained design (including its own power supply and interface) allows for high-density output control in limited cabinet space.
  • Signal Delay: Fast response times with a maximum delay of 0.5 ms for ON and 1.0 ms for OFF states.
  • Status Indicators: Features 18 LED indicators for rapid troubleshooting.
  • 1 COMM LED for communication status. 1 STATUS LED for module health. 16 I/O Status LEDs (typically toggled between two groups to monitor all 32 outputs).
  • Configuration: Includes two DIP switch assemblies to set the rack number, starting I/O group, and transmission rate.
  • 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).
  • Thermal Management: Requires a minimum clearance of 2.0 inches (50.8 mm) on all sides for proper airflow and cooling.
Description
The Allen-Bradley 1791-OB32 is a 1791 Discrete DC Block I/O Module designed as a comprehensive remote I/O solution that integrates all essential components—including the programmable controller interface, power supply, input/output connections, and signal generating circuit—into a single compact unit. The 1791-OB32 is specifically engineered for distributed control architectures where space efficiency and simplified wiring are paramount. This module is fully compatible with the PLC-2, PLC-3, PLC-5/250, and PLC-5 series of programmable controllers, as well as the SLC 5/02 series of modular controllers, ensuring seamless integration into legacy Rockwell Automation control systems. The 1791-OB32 serves as a cost-effective mounting solution for smaller, less expensive enclosures, making it particularly well-suited for applications such as packaging machinery, material handling systems, and operator interface panels where localized I/O processing reduces wiring complexity and improves system responsiveness.

The 1791-OB32 module is designated as Series B and operates with a 24V DC nominal voltage, requiring 300mA current for proper operation.  The 1791-OB32 delivers robust output current capabilities with a rating of 500mA at 60°C for vertical mounting configurations and 250mA at 60°C for horizontal mounting arrangements, accommodating various installation orientations based on thermal management requirements. The 1791-OB32 exhibits a maximum power dissipation of 19.2W and maximum thermal dissipation of 65.5 BTU/hr, necessitating appropriate enclosure ventilation to maintain optimal operating temperatures. The 1791-OB32 features a minimum On-state Current of 1mA per output, a maximum On-state voltage drop of 1V at the rated current, and a maximum Off-state leakage current of 0.5mA, ensuring reliable switching performance for connected field devices.

The 1791-OB32 demonstrates exceptional switching speed characteristics with a maximum output signal delay of 0.5ms at On-state and 1.0ms at Off-state, facilitating rapid response times for time-critical control applications. For proper wiring installation, the 1791-OB32 requires 2.0 mm² (14 AWG) solid standard wire with maximum insulation thickness of 3/64 inch to ensure secure terminal connections and electrical integrity. The 1791-OB32 utilizes Universal Remote I/O communication protocol for distributing I/O functionality at remote locations throughout the manufacturing facility, reducing the need for extensive home-run wiring back to the central processor. The 1791-OB32 module incorporates removable terminal strips for power and I/O connections, a design feature that significantly reduces maintenance time by eliminating the need for complete rewiring when block replacement becomes necessary. The 1791-OB32 contains two switch assemblies that enable configuration of the starting I/O group, I/O rack number, communication rate, last state, and last chassis parameters, providing flexible addressing and communication options. The 1791-OB32 is equipped with 1 COMM indicator, 1 STATUS indicator, and 16 I/O Status indicators that facilitate real-time monitoring and streamlined troubleshooting procedures for maintenance personnel.
Revisions

Revision Part #

Also known as

1791-OB32 Ser A
1791-OB32/A, Series A, Rev A
1791-OB32 Ser B
1791-OB32/B, Series B, Rev B
Alternative Names
1791 OB32 1791-0B32 1791-OB32P 1791-0832 179I-OB32
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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 1791-OB32 module?
The 1791-OB32 is a high-density DC output Block I/O module from Allen-Bradley, designed as a compact and integrated remote I/O solution for distributed control systems.
What makes the 1791-OB32 a complete I/O solution?
The module integrates the PLC communication interface, power supply, I/O connections, and signal circuitry into a single unit, reducing system complexity and saving installation space.
What are the power and thermal specifications?
The module has a maximum power dissipation of 19.2 W and thermal dissipation of 65.5 BTU/hr, requiring proper enclosure ventilation for optimal performance.

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