Siemens 6SL3544-0FB20-1FA0 SINAMICS G120D CU240D-2 PN control unit

Siemens identifies 6SL3544-0FB20-1FA0 as a SINAMICS G120D CU240D-2 PN control unit with PROFINET and onboard STO. The Siemens declaration describes it as a modular control unit for conveyor applications with IP65 protection and without a power module.

System function and position

Rebuilt from individual evidence

Siemens identifies 6SL3544-0FB20-1FA0 as a SINAMICS G120D CU240D-2 PN control unit with PROFINET and onboard STO.

The Siemens declaration describes it as a modular control unit for conveyor applications with IP65 protection and without a power module.

Sits at the control layer of the distributed G120D drive, alongside the separate power module.

Unknown: installed topology, wiring, firmware, unit condition, and replacement compatibility for 6SL3544-0FB20-1FA0 require separate evidence.

Exact reference: 6SL3544-0FB20-1FA0
Category: Drives / VFD
Evidence checked: 2026-09-12

System role

This section explains what the product does and where it acts in the surrounding system.

Function: Controls a distributed SINAMICS G120D motor drive and provides the documented PROFINET and STO functions.
System position: Sits at the control layer of the distributed G120D drive, alongside the separate power module.
Upstream / inputs: Receives PROFINET commands and safety-control inputs from the upstream automation system.
Downstream / outputs: Sends control and safety signals to the downstream G120D power stage.
Limitations: Unknown: installed topology, wiring, firmware, unit condition, and replacement compatibility for 6SL3544-0FB20-1FA0 require separate evidence.

Evidence ledger

Facts, inferences, and unknowns are kept separate.

Facts

Siemens identifies 6SL3544-0FB20-1FA0 as a SINAMICS G120D CU240D-2 PN control unit with PROFINET and onboard STO.
Confidence: high
- cache.industry.siemens.com — retrieved 2026-09-12; high confidence
The Siemens declaration describes it as a modular control unit for conveyor applications with IP65 protection and without a power module.
Confidence: high
- cache.industry.siemens.com — retrieved 2026-09-12; high confidence

Inferences

Inferred system position: Sits at the control layer of the distributed G120D drive, alongside the separate power module.
Confidence: medium
Rationale: The exact product description and documented operating context establish this system placement.
- cache.industry.siemens.com — retrieved 2026-09-12; high confidence

Unknowns

Unknown: installed topology, wiring, firmware, unit condition, and replacement compatibility for 6SL3544-0FB20-1FA0 require separate evidence.
Confidence: low
Missing evidence: The individual lookup does not establish the installed topology, wiring, firmware, unit condition, or replacement fit.

System position diagram

A flow from the upstream system through 6SL3544-0FB20-1FA0 to the downstream drive system. — Sits at the control layer of the distributed G120D drive, alongside the separate power module.

View Mermaid source

flowchart LR
  upstream["Upstream system"] --> item["6SL3544-0FB20-1FA0"]
  item --> downstream["Downstream drive system"]

View diagram labels

Nodes: Upstream system; 6SL3544-0FB20-1FA0; Downstream drive system
Edges: Documented input path; Documented output path

Next action

The captured evidence supports the documented system role for 6SL3544-0FB20-1FA0.

Unknown: installed topology, wiring, firmware, unit condition, and replacement compatibility for 6SL3544-0FB20-1FA0 require separate evidence.

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