Allen-Bradley 1746-NI16I SLC 16-point analog current input module

1746-NI16I is a documented analog current input module used within an industrial automation system.

System function

Rebuilt from individual evidence

Unknown: Evidence and limits

Rockwell Automation documentation identifies 1746-NI16I as an SLC analog input module for sixteen single-ended current channels.

The module converts sixteen current inputs into SLC input data; the exact transmitter wiring, ranges, and program are not documented.

Unknown: Installation-specific compatibility remains undocumented.

Exact reference: 1746-NI16I
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: Receives and processes the documented signals or supply for this analog current input module.
System position: Sits in the analog current input module path between the documented upstream boundary and the controlled system boundary.
Upstream / inputs: External current transmitters and their matching power supply provide the analog field signals; the SLC chassis provides the system connection.
Downstream / outputs: The module converts sixteen current inputs into SLC input data; the exact transmitter wiring, ranges, and program are not documented.
Limitations: Unknown: the exact installation, controller program, wiring, firmware, and commissioning parameters.

Evidence ledger

Facts, inferences, and unknowns are kept separate.

Facts

Rockwell Automation documentation identifies 1746-NI16I as an SLC analog input module for sixteen single-ended current channels.
Confidence: high
- literature.rockwellautomation.com — retrieved 2026-09-11; high confidence
- www.santaclarasystems.com — retrieved 2026-09-11; medium confidence
The module converts sixteen current inputs into SLC input data; the exact transmitter wiring, ranges, and program are not documented.
Confidence: medium
- literature.rockwellautomation.com — retrieved 2026-09-11; high confidence
- www.santaclarasystems.com — retrieved 2026-09-11; medium confidence

Inferences

Inferred system position: 1746-NI16I is installed in the analog current input module path between its documented upstream signals or supply and the controlled system boundary.
Confidence: medium
Rationale: The exact-reference sources identify the product type and a connected system boundary; the placement statement is explicitly marked as an inference.
- literature.rockwellautomation.com — retrieved 2026-09-11; high confidence
- www.santaclarasystems.com — retrieved 2026-09-11; medium confidence

Unknowns

Unknown: the exact installation, controller program, wiring, firmware, and commissioning parameters.
Confidence: low
Missing evidence: No exact installation, controller program, wiring, firmware, or commissioning record was captured.

System position diagram

A signal path shows documented upstream signals or supply entering 1746-NI16I, a analog current input module, which connects to the controlled system boundary. — System position inferred from the exact-reference evidence: the analog current input module sits between the documented upstream and downstream boundaries.

View Mermaid source

flowchart LR\n  upstream["Documented upstream signals or supply"] --> unit["1746-NI16I analog current input module"]\n  unit --> downstream["Controlled system boundary"]

View diagram labels

Nodes: Documented upstream signals or supply; 1746-NI16I analog current input module; Controlled system boundary
Edges: Documented supply or signals; System output path

Next action

The captured evidence supports a concrete analog current input module role for 1746-NI16I; installation-specific compatibility remains unknown.

Unknown: Installation-specific compatibility and connected equipment must be verified before installation or replacement.

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