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The 1756-OB32 is a ControlLogix series discrete output component featuring 32 output channels. This hardware provides two isolated groups of 16 outputs each, supporting an operating voltage range of 12 to 24V DC to facilitate flexible wiring across different electrical control schemes.
Direct-connect or rack-optimized communication
Isolated and nonisolated module types
Field-side diagnostics on select modules
The 1756-OB32 limits its maximum power consumption to 4.8 Watts under a full load at 60 degrees Celsius. It has a thermal dissipation rating of 16.37 BTU per Hour, reducing the load on panel ventilation systems. The open-style enclosure requires installation inside a protected industrial housing, and the front interface connects with 36-pin Removable Terminal Blocks (RTB) such as the 1756-TBCH or 1756-TBS6H to secure solid or stranded copper field wires.
This 32-point digital output module supports Removal and Insertion Under Power (RIUP), allowing module hot-swaps without interrupting backplane communication or cutting power to the rest of the controller chassis. This function limits unexpected downtime and shortens Mean Time to Repair (MTTR) in continuous processing environments. The module is used to directly drive DC solenoid valves, interposing relays, contactor coils, status pilot lights, and localized audible alarms in sectors such as automotive assembly, food and beverage processing, material handling, and automated packaging lines.
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description.
Allen Bradley 1756-OB32 Digital Output Module Manuals, Datasheets, Drivers, 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.
Automotive Manufacturing
Directly drives low-power DC directional solenoid valves, cylinder control valves, and station status indicator lights in stamping and pneumatic tooling fixture controls.
Water & Wastewater Treatment
Controls small DC motorized valve actuators, interposing relays in pump rooms and dosing stations, and centralized fault alarm buzzers on main control panels.
Plastics & Rubber Molding
Drives ejector cylinder valves, vacuum loader control relays, and DC output loops for various safety barrier interlocks in injection molding machines or auxiliary feeding systems.
Chemical & Petrochemical Auxiliary Systems
Used for driving automatic sampling valves in tank farms, backwash filter interlocking solenoid valves, and status indicator lights on remote explosion-proof operator boxes (requiring safety barriers).
Metallurgical Auxiliary Production Lines
Handles high-frequency DC discrete output driving in rolling mill auxiliary cooling fans, hydraulic station control valves, and discrete action logics of steel coil strapping machines.
Cement & Mining Conveying
Controls electric actuator contactors for material diverting chutes, anti-misalignment dust suppression spray valves, and startup warning bells along conveyor belts.
When using the Allen-Bradley 1756-OB32 module, verify that the external DC power supply stays within the 10 to 31.2V DC range and that each point draws at least the 3 mA minimum load current to ensure clean switching. Group connections logically across its two isolated 16-point segments to prevent cross-circuit interference, install it inside a protected housing to shield its open-style enclosure, and safely perform hot-swapping by utilizing its Removal and Insertion Under Power (RIUP) function.
The Allen-Bradley 1756-OB32 is a ControlLogix 32-point high-density DC output module, divided into two groups of 16 channels each, supporting 12/24V DC and Removal and Insertion Under Power (RIUP). This module features low thermal dissipation, making it highly suitable for driving solenoid valves and relays in industrial control environments.
It is a high-density, 32-point 12/24V DC digital output module for the ControlLogix platform.
What is the primary function of the 1756-OB32?
It sources DC voltage from the system to switch on or off external field devices based on controller logic.
What is the voltage range supported by the 1756-OB32?
It operates within a nominal voltage range of 12V to 24V DC.
How many channels or points does the 1756-OB32 have?
It features 32 independent output points, organized into two separate groups of 16 channels each.
Which Removable Terminal Block is compatible with the 1756-OB32?
It requires a 36-pin terminal block, such as the 1756-TBNH or 1756-TBSH, which must be ordered separately.
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