1756-PB75/B ControlLogix DC power supply

1756-PB75/B converts 19-32 VDC input into a 75 W class ControlLogix chassis supply.

System role and rating

Rebuilt from individual evidence

Unknown: verification boundary

Rockwell documentation lists the exact 1756-PB75/B as a standard ControlLogix DC power supply. It specifies a 19-32 VDC input family and a 75 W maximum output class.

The supply converts incoming DC power into the ControlLogix chassis power bus.

Unknown: cabinet load, redundancy design, wiring condition and condition of an individual 1756-PB75/B unit.

Exact reference: 1756-PB75/B
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 a 75 W class ControlLogix chassis supply.
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: The supply feeds regulated power to the ControlLogix chassis.
Limitations: Unknown: cabinet load, redundancy design, wiring condition and condition of an individual 1756-PB75/B unit.

Evidence ledger

Facts, inferences, and unknowns are kept separate.

Facts

Rockwell technical and installation documentation lists the exact 1756-PB75/B as a standard ControlLogix DC power supply.
Confidence: high
- literature.rockwellautomation.com — retrieved 2026-09-11; high confidence
- literature.rockwellautomation.com — retrieved 2026-09-11; high confidence
The documentation specifies a 19-32 VDC input family and a 75 W maximum output class for 1756-PB75/B.
Confidence: high
- literature.rockwellautomation.com — retrieved 2026-09-11; high confidence
- literature.rockwellautomation.com — retrieved 2026-09-11; high confidence

Inferences

The supply converts incoming DC power into the ControlLogix chassis power bus.
Confidence: high
Rationale: Rockwell lists the exact reference in standard DC supply tables and its installation documentation.
- literature.rockwellautomation.com — retrieved 2026-09-11; high confidence
- literature.rockwellautomation.com — retrieved 2026-09-11; high confidence

Unknowns

Unknown: cabinet load, redundancy design, wiring condition and condition of an individual 1756-PB75/B unit.
Confidence: low
Missing evidence: The captured documentation does not provide a site power design or individual unit inspection.

System position diagram

A 19-32 VDC source feeds 1756-PB75/B and its output feeds the ControlLogix chassis. — The Series B supply converts DC input into ControlLogix chassis power.

View Mermaid source

flowchart LR
 src["19-32 VDC source"] --> psu["1756-PB75/B"]
 psu --> bus["ControlLogix chassis power bus"]

View diagram labels

Nodes: 19-32 VDC source; 1756-PB75/B; ControlLogix chassis power bus
Edges: DC input; Chassis power

Next action

The Rockwell evidence supports publishing this exact Series B reference as a ControlLogix DC power supply.

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

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