6FC5357-0BB15-0AB0 SINUMERIK 840D NCU 571.5B

6FC5357-0BB15-0AB0 processes cnc and plc control tasks for a sinumerik 840d/de system.

System role and signal path

Rebuilt from individual evidence

Unknown: verification boundary

Siemens identifies 6FC5357-0BB15-0AB0 as the SINUMERIK NCU 571.5B control module. Processes CNC and PLC control tasks for a SINUMERIK 840D/DE system

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

Unknown: the firmware, installation configuration, and condition of an individual SINUMERIK 840D NCU 571.5B unit.

Exact reference: 6FC5357-0BB15-0AB0
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/DE control point between CNC programs and connected machine subsystems
System position: Acts as the SINUMERIK 840D/DE 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 NCU 571.5B unit.

Evidence ledger

Facts, inferences, and unknowns are kept separate.

Facts

Siemens identifies 6FC5357-0BB15-0AB0 as the SINUMERIK NCU 571.5B control module.
Confidence: high
- support.industry.siemens.com — retrieved 2026-09-12; high confidence
Processes CNC and PLC control tasks for a SINUMERIK 840D/DE system
Confidence: high
- support.industry.siemens.com — retrieved 2026-09-12; high confidence
- www.etoh24.de — retrieved 2026-09-12; medium confidence

Inferences

Acts as the SINUMERIK 840D/DE control point between CNC programs and connected machine subsystems
Confidence: medium
Rationale: The exact-reference description and documented system function establish the adjacent stages.
- support.industry.siemens.com — retrieved 2026-09-12; high confidence
- www.etoh24.de — retrieved 2026-09-12; medium confidence

Unknowns

Unknown: the firmware, installation configuration, and condition of an individual SINUMERIK 840D NCU 571.5B 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/DE 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/DE 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["6FC5357-0BB15-0AB0"]\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; 6FC5357-0BB15-0AB0; The NCU sends processed control data to connected machine subsystems
Edges: Documented input path; Documented output path

Next action

The captured evidence supports publishing 6FC5357-0BB15-0AB0 as SINUMERIK 840D NCU 571.5B.

Confirm the installed system configuration and unit condition before commissioning.

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