1747-L542 SLC 5/04 32K controller

1747-L542 provides SLC 5/04 CPU processing with 32K memory and Data Highway Plus communication.

System role and communication

Rebuilt from individual evidence

Unknown: verification boundary

Rockwell Automation identifies 1747-L542 as an SLC 5/04 32K Controller. It provides SLC 5/04 CPU processing and Data Highway Plus communication.

The controller is the processing and network communication point between SLC 500 I/O data, the control program and Data Highway Plus traffic.

Unknown: the firmware, program, battery state and condition of an individual 1747-L542 unit.

Exact reference: 1747-L542
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: Processes an SLC 500 control program and provides Data Highway Plus communication.
System position: Acts as the network communication and processing point in an SLC 500 control system.
Upstream / inputs: SLC 500 I/O data, program instructions and Data Highway Plus traffic enter the controller.
Downstream / outputs: The CPU produces control decisions and exchanges Data Highway Plus traffic.
Limitations: Unknown: the firmware, program, battery state and condition of an individual 1747-L542 unit.

Evidence ledger

Facts, inferences, and unknowns are kept separate.

Facts

Rockwell Automation identifies 1747-L542 as an SLC 5/04 32K Controller.
Confidence: high
- www.rockwellautomation.com — retrieved 2026-09-11; high confidence
The controller provides SLC 5/04 CPU processing with 32K memory and Data Highway Plus communication.
Confidence: high
- www.rockwellautomation.com — retrieved 2026-09-11; high confidence

Inferences

The controller is the processing and Data Highway Plus communication point in an SLC 500 control system.
Confidence: high
Rationale: Rockwell classifies the exact reference as an SLC 5/04 controller with Data Highway Plus communication.
- www.rockwellautomation.com — retrieved 2026-09-11; high confidence

Unknowns

Unknown: the firmware, program, battery state and condition of an individual 1747-L542 unit.
Confidence: low
Missing evidence: The product page does not provide unit-specific firmware, program or physical inspection evidence.

System position diagram

SLC 500 I/O reaches 1747-L542 while Data Highway Plus traffic exchanges with the controller. — The SLC 5/04 CPU processes I/O and exchanges Data Highway Plus traffic.

View Mermaid source

flowchart LR
 io["SLC 500 I/O"] --> cpu["1747-L542"]
 cpu <--> dh["Data Highway Plus"]
 cpu --> out["Control output path"]

View diagram labels

Nodes: SLC 500 I/O; 1747-L542; Data Highway Plus
Edges: I/O processing; Network traffic

Next action

The Rockwell evidence supports publishing this exact reference as an SLC 5/04 32K controller with Data Highway Plus communication.

Verify firmware, program, battery, network wiring and I/O compatibility before commissioning.

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