1756-PB72 ControlLogix 24V DC power supply

1756-PB72 converts 19-32 VDC input into ControlLogix chassis power rails.

System role and rails

Rebuilt from individual evidence

Unknown: verification boundary

Rockwell Automation identifies 1756-PB72 as a ControlLogix 24V DC power supply. Its product page documents 19-32 VDC input and chassis output rails.

The supply converts incoming DC power into rails used by the ControlLogix controller and modules, including 5V at 10A, 3.3V at 4A and 1.2V at 1.5A.

Unknown: cabinet loading, redundancy requirements, wiring condition and condition of an individual 1756-PB72 unit.

Exact reference: 1756-PB72
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: Converts 19-32 VDC input into ControlLogix chassis power rails.
System position: Sits between the incoming DC source and the ControlLogix chassis power bus.
Upstream / inputs: An incoming 19-32 VDC source feeds the power supply.
Downstream / outputs: Regulated chassis rails feed the ControlLogix controller and modules.
Limitations: Unknown: cabinet loading, redundancy requirements, wiring condition and condition of an individual 1756-PB72 unit.

Evidence ledger

Facts, inferences, and unknowns are kept separate.

Facts

Rockwell Automation identifies 1756-PB72 as a ControlLogix 24V DC power supply.
Confidence: high
- www.rockwellautomation.com — retrieved 2026-09-11; high confidence
The product page documents 19-32 VDC input and output rails including 5V at 10A, 3.3V at 4A and 1.2V at 1.5A.
Confidence: high
- www.rockwellautomation.com — retrieved 2026-09-11; high confidence
- literature.rockwellautomation.com — retrieved 2026-09-11; high confidence

Inferences

The power supply converts incoming DC power into the ControlLogix chassis rails used by the controller and modules.
Confidence: high
Rationale: Rockwell identifies a ControlLogix DC supply and documents input and chassis output rails.
- www.rockwellautomation.com — retrieved 2026-09-11; high confidence
- literature.rockwellautomation.com — retrieved 2026-09-11; high confidence

Unknowns

Unknown: cabinet loading, redundancy requirements, wiring condition and condition of an individual 1756-PB72 unit.
Confidence: low
Missing evidence: The captured sources provide supply ratings but not a site power design or individual unit inspection.

System position diagram

A 19-32 VDC source feeds 1756-PB72 and regulated rails feed the ControlLogix chassis. — The supply converts the incoming DC source into ControlLogix chassis power rails.

View Mermaid source

flowchart LR
 src["19-32 VDC source"] --> psu["1756-PB72"]
 psu --> bus["ControlLogix chassis rails"]

View diagram labels

Nodes: 19-32 VDC source; 1756-PB72; ControlLogix chassis rails
Edges: DC input; Regulated chassis power

Next action

The Rockwell evidence supports publishing this exact reference as a 24V DC ControlLogix power supply.

Verify source voltage, chassis load, redundancy design and wiring before energizing the system.

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