1756-OF4 ControlLogix four-point analog output module

1756-OF4 converts ControlLogix commands into four current or voltage analog outputs.

System role and channels

Rebuilt from individual evidence

Unknown: verification boundary

Rockwell Automation identifies 1756-OF4 as a ControlLogix four-point analog output module for current or voltage. Its documentation specifies single-ended channels with no isolation between channels.

The module converts ControlLogix output commands into four analog field signals between the chassis and field loads.

Unknown: output mode, load wiring, calibration state and condition of an individual 1756-OF4 unit.

Exact reference: 1756-OF4
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 ControlLogix output commands into four current or voltage analog signals.
System position: Sits between ControlLogix output commands and analog field loads.
Upstream / inputs: ControlLogix analog output commands enter the four-channel module.
Downstream / outputs: Four analog current or voltage signals leave toward field loads.
Limitations: Unknown: output mode, load wiring, calibration state and condition of an individual 1756-OF4 unit.

Evidence ledger

Facts, inferences, and unknowns are kept separate.

Facts

Rockwell Automation identifies 1756-OF4 as a ControlLogix 4-point analog output module for current or voltage.
Confidence: high
- www.rockwellautomation.com — retrieved 2026-09-11; high confidence
The product documentation specifies four analog output points and single-ended channels with no isolation between channels.
Confidence: high
- www.rockwellautomation.com — retrieved 2026-09-11; high confidence
- literature.rockwellautomation.com — retrieved 2026-09-11; high confidence

Inferences

The module converts ControlLogix output commands into four analog field signals.
Confidence: high
Rationale: Rockwell documents a four-point analog output module with current or voltage modes and a field-side channel diagram.
- www.rockwellautomation.com — retrieved 2026-09-11; high confidence
- literature.rockwellautomation.com — retrieved 2026-09-11; high confidence

Unknowns

Unknown: output mode, load wiring, calibration state and condition of an individual 1756-OF4 unit.
Confidence: low
Missing evidence: The captured sources document module behavior but not a site configuration or individual unit inspection.

System position diagram

ControlLogix analog output commands pass through 1756-OF4 to field signals. — The module converts ControlLogix commands into four analog field signals.

View Mermaid source

flowchart LR
 cpu["ControlLogix output commands"] --> mod["1756-OF4"]
 mod --> field["Analog field signals"]

View diagram labels

Nodes: ControlLogix output commands; 1756-OF4; Analog field signals
Edges: Output conversion; Current or voltage signal

Next action

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

Confirm the configured output mode, field load, calibration and wiring before commissioning.

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