The Allen-Bradley 1791-OB16, also cataloged as the 1791-OB16 Block I/O Output Module, operates as a dedicated hardware component for 24 VDC discrete output control within Allen-Bradley Block I/O platforms.

Model Identification

The 1791-OB16 is a 16-point digital output module designed for Block I/O applications. The module provides discrete DC output switching through a compact block-style I/O assembly and interfaces with Allen-Bradley control systems for remote output execution.

The unit belongs to the discontinued Block I/O product family and was discontinued by the manufacturer on 06/30/2015.

Hardware Specifications

PLC I/O Architecture Integration

The Allen-Bradley Block I/O family uses distributed I/O architecture for direct connection of field devices to controller systems. The 1791-OB16 provides digital output execution through 16 discrete channels configured for 24 VDC switching applications.

The module supports I/O density scaling by allowing multiple distributed I/O blocks to be integrated into control networks. System communication performance depends on the selected controller interface and network configuration.

Ordering Information

The shipment configuration includes:

• 1 x Allen-Bradley 1791-OB16 Block I/O Output Module
• 1 x Integrated Block I/O module assembly

Additional controller communication interfaces, terminal accessories, and mounting components are configured separately according to system requirements.

Field Installation Guidelines

Mechanical Installation

• Install the module in a suitable control cabinet environment.
• Secure the unit using the approved mounting arrangement.
• Maintain sufficient space for field wiring access and inspection.

Electrical Wiring

• Verify 24 VDC power polarity before connection.
• Separate output wiring from high-voltage conductors.
• Use appropriate grounding methods for the control enclosure.

Output Channel Connection

• Confirm field device voltage requirements before energizing outputs.
• Check output load compatibility with connected actuators or devices.
• Verify channel addressing during PLC configuration and commissioning.

Frequently Asked Questions

• What type of signals does the 1791-OB16 handle?

  The 1791-OB16 provides 16 discrete digital output points for 24 VDC field device control applications.

• Is the 1791-OB16 part of the Block I/O product family?

  Yes. The module belongs to the Allen-Bradley Block I/O series of distributed digital I/O products.

• What is the output voltage rating of this module?

  The module is specified for 24 VDC Block I/O output applications.

• How many output channels are available?

  The 1791-OB16 contains 16 digital output points within one module assembly.

• Can this module be installed as a standalone controller?

  No. The module operates as an I/O component and requires a compatible control system interface.

• Does the module support analog signals?

  No. The 1791-OB16 is a digital output module and does not provide analog signal processing.

• What installation method is used for this module?

  The module is installed as a block-style I/O unit within an industrial control enclosure.

• Are output addresses configured through the PLC system?

  Yes. Output addressing is normally assigned through the connected Allen-Bradley controller configuration.