1756-DHRIO/E ControlLogix DH+ and Remote I/O module

1756-DHRIO/E routes ControlLogix traffic to DH+ and Remote I/O networks through documented channels.

System role and channels

Rebuilt from individual evidence

Unknown: verification boundary

Rockwell Automation identifies 1756-DHRIO/E as a ControlLogix DH+ and Remote I/O communication module. Technical data documents two channels and Remote I/O scanner operation.

The module routes ControlLogix traffic at the chassis boundary to DH+ and Remote I/O networks; documented rates are 57.6, 115.2 or 230.4 Kbps.

Unknown: network topology, firmware state and condition of an individual 1756-DHRIO/E unit.

Exact reference: 1756-DHRIO/E
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: Routes ControlLogix traffic to DH+ and Remote I/O networks through two documented channels.
System position: Sits at the ControlLogix chassis communication boundary before DH+ and Remote I/O networks.
Upstream / inputs: ControlLogix chassis traffic enters the communication module channels.
Downstream / outputs: DH+ and Remote I/O scanner traffic leaves toward connected network devices.
Limitations: Unknown: network topology, firmware state and condition of an individual 1756-DHRIO/E unit.

Evidence ledger

Facts, inferences, and unknowns are kept separate.

Facts

Rockwell Automation identifies 1756-DHRIO/E as a ControlLogix DH+ and Remote I/O communication module.
Confidence: high
- www.rockwellautomation.com — retrieved 2026-09-11; high confidence
- literature.rockwellautomation.com — retrieved 2026-09-11; high confidence
Rockwell technical data documents two channels with Remote I/O scanner operation, 57.6, 115.2 or 230.4 Kbps rates and 32 logical rack connections per channel.
Confidence: high
- literature.rockwellautomation.com — retrieved 2026-09-11; high confidence

Inferences

The module routes ControlLogix traffic to DH+ and Remote I/O networks at the chassis communication boundary.
Confidence: high
Rationale: The manufacturer identifies DH+ and Remote I/O communication and documents scanner channels and rack connections.
- literature.rockwellautomation.com — retrieved 2026-09-11; high confidence

Unknowns

Unknown: network topology, firmware state and condition of an individual 1756-DHRIO/E unit.
Confidence: low
Missing evidence: The captured sources do not provide a site topology, project file or individual unit inspection.

System position diagram

1756-DHRIO/E routes ControlLogix chassis traffic to DH+ and Remote I/O networks. — The documented path is ControlLogix chassis traffic through 1756-DHRIO/E to DH+ and Remote I/O networks.

View Mermaid source

flowchart LR
 chassis["ControlLogix chassis"] --> mod["1756-DHRIO/E"]
 mod --> dh["DH+ network"]
 mod --> rio["Remote I/O network"]

View diagram labels

Nodes: ControlLogix chassis; 1756-DHRIO/E; DH+ and Remote I/O networks
Edges: Chassis traffic; Network routing

Next action

The Rockwell evidence supports publishing this exact Series E reference as a ControlLogix DH+ and Remote I/O communication module.

Verify the site network topology, channel rates, firmware and rack configuration before commissioning.

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