6FC5372-0AA00-0AA2 SINUMERIK 840D sl NCU 720.2 controller

6FC5372-0AA00-0AA2 processes cnc and plc control tasks for a sinumerik 840d sl system.

System role and signal path

Rebuilt from individual evidence

Unknown: verification boundary

Siemens identifies 6FC5372-0AA00-0AA2 as a SINUMERIK 840D sl NCU 720.2 with PLC 317-2DP. Processes CNC and PLC control tasks for a SINUMERIK 840D sl system

Processes CNC and PLC control tasks for a SINUMERIK 840D sl system Acts as the SINUMERIK 840D sl control point between CNC programs and connected machine subsystems.

Unknown: the firmware, installation configuration, and condition of an individual SINUMERIK 840D sl NCU 720.2 controller unit.

Exact reference: 6FC5372-0AA00-0AA2
Category: PLC / CPU
Evidence checked: 2026-09-12

System role

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

Function: Acts as the SINUMERIK 840D sl control point between CNC programs and connected machine subsystems
System position: Acts as the SINUMERIK 840D sl control point between CNC programs and connected machine subsystems
Upstream / inputs: CNC programs, PLC logic, and field communication data enter the NCU
Downstream / outputs: The NCU sends processed control data to connected machine subsystems
Limitations: Unknown: the firmware, installation configuration, and condition of an individual SINUMERIK 840D sl NCU 720.2 controller unit.

Evidence ledger

Facts, inferences, and unknowns are kept separate.

Facts

Siemens identifies 6FC5372-0AA00-0AA2 as a SINUMERIK 840D sl NCU 720.2 with PLC 317-2DP.
Confidence: high
- mall.industry.siemens.com — retrieved 2026-09-12; high confidence
Processes CNC and PLC control tasks for a SINUMERIK 840D sl system
Confidence: high
- mall.industry.siemens.com — retrieved 2026-09-12; high confidence
- cache.industry.siemens.com — retrieved 2026-09-12; high confidence

Inferences

Acts as the SINUMERIK 840D sl control point between CNC programs and connected machine subsystems
Confidence: medium
Rationale: The exact-reference description and documented system function establish the adjacent stages.
- mall.industry.siemens.com — retrieved 2026-09-12; high confidence
- cache.industry.siemens.com — retrieved 2026-09-12; high confidence

Unknowns

Unknown: the firmware, installation configuration, and condition of an individual SINUMERIK 840D sl NCU 720.2 controller unit.
Confidence: low
Missing evidence: The sources describe the product family but do not inspect an individual unit.

System position diagram

Processes CNC and PLC control tasks for a SINUMERIK 840D sl system connects cnc programs, plc logic, and field communication data enter the ncu to the ncu sends processed control data to connected machine subsystems. — Processes CNC and PLC control tasks for a SINUMERIK 840D sl system between the documented upstream and downstream stages.

View Mermaid source

flowchart LR\n upstream["CNC programs, PLC logic, and field communication data enter the NCU"] --> product["6FC5372-0AA00-0AA2"]\n product --> downstream["The NCU sends processed control data to connected machine subsystems"]

View diagram labels

Nodes: CNC programs, PLC logic, and field communication data enter the NCU; 6FC5372-0AA00-0AA2; The NCU sends processed control data to connected machine subsystems
Edges: Documented input path; Documented output path

Next action

The captured evidence supports publishing 6FC5372-0AA00-0AA2 as SINUMERIK 840D sl NCU 720.2 controller.

Confirm the installed system configuration and unit condition before commissioning.

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