Allen-Bradley 1756-OB32 ControlLogix 32 Pt 12/24V DC D/O Module

Description 

The Allen-Bradley 1756-OB32 is a ControlLogix digital output module designed for industrial automation systems. It provides 32 sourcing DC outputs, divided into two groups of 16 points, for controlling field devices. Operating within a voltage range of 10 to 31.2 VDC, this module is widely used in applications requiring reliable high-density output interfacing.

Technical Specifications 

Information About 1756-OB32

The 1756-OB32 is part of the Allen-Bradley ControlLogix I/O family, developed to deliver flexible and scalable output control. It supports 32 DC sourcing outputs with groupings of 16 points per channel bank. Each output channel is rated for up to 0.5 A at 50 °C or 0.35 A at 60 °C, with a maximum module current of 16 A at 50 °C and 10 A at 60 °C. Compatible removable terminal blocks (RTBs) include the 1756-TBCH cage clamp and the 1756-TBS6H spring clamp, providing secure wiring options. The module supports various communication modes such as scheduled output data, rack optimization, and listen-only configurations. Output fault states can be configured per point, with options to hold last state, force ON, or force OFF in program or fault conditions. Protection can be implemented using 5x20 mm fuses (800 mA rating), such as Littelfuse SP001.1003 or Schurter 216.800. The module dissipates up to 4.8 W of power and maintains 50 V continuous isolation between field-side and backplane. Its backplane current draw is 300 mA at 5.1 VDC and 2 mA at 24 VDC.

Key Features:

• Outputs: 32 DC sourcing outputs, grouped into 2 × 16-point banks.

• Voltage Range: Operates from 10 to 31.2 VDC.

• Output Current: 0.5 A per point at 50 °C, 0.35 A per point at 60 °C.

• Module Current Capacity: 16 A maximum at 50 °C, 10 A maximum at 60 °C.

• RTB Compatibility: Works with 1756-TBCH (cage clamp) and 1756-TBS6H (spring clamp).

• Fault Handling: Configurable per-point states for fault and program conditions.

• Protection: Fuse-compatible design with recommended 800 mA fuses.

• Isolation: 50 V continuous isolation between backplane and outputs.

The 1756-OB32 delivers the density, flexibility, and reliability needed for high-performance digital output control in ControlLogix automation systems.

Manufacturer information

Allen-Bradley, a brand of Rockwell Automation, specializes in manufacturing industrial automation equipment. The product range includes programmable logic controllers (PLCs), motion control systems, safety devices, motor control equipment, automation software, and HMI panels. Allen-Bradley products are known for their reliability and integration with other systems.