1746-NI4 SLC analog input module

1746-NI4 converts four selectable field analog channels into SLC 500 input values.

System role and signal path

Rebuilt from individual evidence

Unknown: verification boundary

Rockwell Automation identifies 1746-NI4 as an SLC 4 Point Analog Input Module. Its four selectable voltage or current channels convert field signals into 16-bit values in the SLC 500 input image.

The module sits between field analog wiring and the SLC 500 processor scan, supplying one input-image word per channel for processor updates.

Unknown: the condition, channel configuration and compatibility of an individual unit.

Exact reference: 1746-NI4
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 four field voltage or current signals into SLC 500 input values.
System position: Sits between field analog wiring and the SLC 500 processor scan.
Upstream / inputs: Field voltage or current signals enter the selectable analog channels.
Downstream / outputs: Converted 16-bit channel values flow into the SLC 500 input image.
Limitations: Unknown: the condition, channel configuration and compatibility of an individual unit.

Evidence ledger

Facts, inferences, and unknowns are kept separate.

Facts

Rockwell Automation identifies 1746-NI4 as an SLC 4 Point Analog Input Module.
Confidence: high
- www.rockwellautomation.com — retrieved 2026-09-11; high confidence
The 1746-NI4 manual documents four selectable voltage or current analog channels that convert signals into 16-bit values in the SLC 500 input image.
Confidence: high
- literature.rockwellautomation.com — retrieved 2026-09-11; high confidence

Inferences

The module sits between field analog signals and an SLC 500 processor scan.
Confidence: high
Rationale: The manual describes signal conversion into one input-image word per channel for processor updates.
- literature.rockwellautomation.com — retrieved 2026-09-11; high confidence

Unknowns

Unknown: the condition, channel configuration and compatibility of an individual unit.
Confidence: low
Missing evidence: The captured product page and manual do not inspect an individual unit or its project configuration.

System position diagram

Field analog signals pass through 1746-NI4 into an SLC input image for the processor scan. — The documented path is field analog signal to 1746-NI4 conversion to the SLC input image.

View Mermaid source

flowchart LR
 field["Field analog signals"] --> module["1746-NI4"]
 module --> image["SLC input image"]
 image --> cpu["SLC processor scan"]

View diagram labels

Nodes: Field analog signals; 1746-NI4; SLC processor scan
Edges: Signal conversion; Input image update

Next action

The captured Rockwell evidence supports publishing this exact reference as a four-channel SLC analog input module.

Confirm the unit nameplate, channel mode and SLC project before wiring or commissioning.

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