1756-OB32 | Allen Bradley | ControlLogix 32-Point Digital Output Module

Product Overview

The Allen Bradley 1756-OB32 provides high-density discrete output control for the ControlLogix chassis environment. This module enables the processor to switch 32 independent field-side devices, such as solenoids, motor starters, and indicators. By utilizing a sourcing configuration across two distinct groups, it offers a compact solution for large-scale automation projects requiring extensive I/O counts within a single slot footprint. We supply this unit as 100% Brand New original factory stock, ensuring the hardware meets the rigorous timing and electrical isolation standards required for mission-critical logic execution.

Technical Specifications

Engineering Advantages

• High-Density Cabinet Optimization: The 1756-OB32 packs 32 output points into a single chassis slot. This density reduces the number of I/O chassis required for large systems, directly lowering hardware costs and shrinking the footprint of the control enclosure.

• Thermal Efficiency: The module manages heat effectively, dissipating only 4.8 Watts at its maximum operating temperature. This low thermal signature prevents localized hot spots within the chassis, protecting neighboring analog or processor modules from heat-induced drift or failure.

• Simplified Group Wiring: The architecture divides the 32 points into two groups of 16. This separation allows engineers to isolate different functional zones or safety circuits on the same module, facilitating easier troubleshooting and circuit segmentation without requiring multiple low-density cards.

• Electronic Keying: Like all ControlLogix modules, the 1756-OB32 supports electronic keying. This feature prevents the system from starting if the wrong module type is inserted during maintenance, protecting field-side equipment from incompatible voltage or signal types.

FAQs

• What type of Removable Terminal Block (RTB) does the 1756-OB32 require?

  The high-density 32-point layout requires a 36-pin RTB, specifically the 1756-TBCH (Cage Clamp) or 1756-TBS6H (Spring Clamp). These terminal blocks do not ship with the module and you must purchase them separately.

• Can the 1756-OB32 switch AC loads?

  No. The 1756-OB32 is a DC-sourcing module designed for 10–31.2V DC applications. Attempting to switch AC loads will damage the solid-state output circuitry. For AC switching, utilize the 1756-OA or 1756-OW series modules.

• Is this a refurbished or "new-surplus" unit?

  Absolutely not. We guarantee that this 1756-OB32 is 100% Brand New, original Allen Bradley equipment. It ships in the original factory box with the UPC 662468702997 and the factory seal intact.

• How do I handle the high wiring density of 32 points in one slot?

  To simplify installation and reduce wiring errors, many engineers utilize the Allen Bradley IFM (Interface Module) and pre-wired cables. This transitions the 36-pin module connection to a DIN-rail mounted terminal strip for cleaner cable management.