1756-OB32 ControlLogix 32-point DC output module

1756-OB32 switches 32 ControlLogix outputs for 10-31 VDC field loads.

System role and output range

Rebuilt from individual evidence

Unknown: verification boundary

Rockwell Automation identifies 1756-OB32 as a ControlLogix 32-point 12/24V DC digital output module. Rockwell documents a 10-31 VDC range and 0.35 A per point.

The module switches ControlLogix output commands between the chassis and connected DC field loads.

Unknown: load wiring, protection settings, firmware state and condition of an individual 1756-OB32 unit.

Exact reference: 1756-OB32
Category: PLC / CPU
Evidence checked: 2026-09-11

System role

This section explains what the product does and where it acts in the surrounding system.

Function: Switches 32 ControlLogix digital outputs toward 10-31 VDC field loads.
System position: Sits between ControlLogix output commands and connected DC field loads.
Upstream / inputs: ControlLogix output commands enter the 32-point output module.
Downstream / outputs: Switched 10-31 VDC output power reaches connected field loads.
Limitations: Unknown: load wiring, protection settings, firmware state and condition of an individual 1756-OB32 unit.

Evidence ledger

Facts, inferences, and unknowns are kept separate.

Facts

Rockwell Automation identifies 1756-OB32 as a ControlLogix 32-point 12/24V DC digital output module.
Confidence: high
- www.rockwellautomation.com — retrieved 2026-09-11; high confidence
- configurator.rockwellautomation.com — retrieved 2026-09-11; high confidence
Rockwell documents 32 outputs rated for 10-31 VDC with 0.35 A per point at 10-31 VDC.
Confidence: high
- www.rockwellautomation.com — retrieved 2026-09-11; high confidence
- configurator.rockwellautomation.com — retrieved 2026-09-11; high confidence

Inferences

The module switches ControlLogix output commands toward 10-31 VDC field loads.
Confidence: high
Rationale: The manufacturer documents a digital output module with 32 DC output points and per-point output current.
- www.rockwellautomation.com — retrieved 2026-09-11; high confidence
- configurator.rockwellautomation.com — retrieved 2026-09-11; high confidence

Unknowns

Unknown: load wiring, protection settings, firmware state and condition of an individual 1756-OB32 unit.
Confidence: low
Missing evidence: The captured sources provide module ratings but not a site wiring design or unit inspection.

System position diagram

ControlLogix output commands pass through 1756-OB32 to DC field loads. — The module switches ControlLogix output commands to connected 10-31 VDC field loads.

View Mermaid source

flowchart LR
 cpu["ControlLogix output commands"] --> mod["1756-OB32"]
 mod --> load["10-31 VDC field loads"]

View diagram labels

Nodes: ControlLogix output commands; 1756-OB32; 10-31 VDC field loads
Edges: Digital output commands; Switched DC output

Next action

The Rockwell evidence supports publishing this exact reference as a 32-point ControlLogix DC output module.

Check field-load voltage, current, wiring protection and unit condition before energizing outputs.

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