6FC5357-0BB34-0AA0 SINUMERIK 840D NCU 573.4

6FC5357-0BB34-0AA0 processes cnc, plc, and communication tasks for a sinumerik 840d machine.

System role and signal path

Rebuilt from individual evidence

Unknown: verification boundary

Siemens identifies 6FC5357-0BB34-0AA0 as a SINUMERIK 840D NCU 573.4. Processes CNC, PLC, and communication tasks for a SINUMERIK 840D machine

Processes CNC, PLC, and communication tasks for a SINUMERIK 840D machine Acts as the SINUMERIK 840D CPU between control programs and connected machine subsystems.

Unknown: the firmware, installation configuration, and condition of an individual SINUMERIK 840D NCU 573.4 unit.

Exact reference: 6FC5357-0BB34-0AA0
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 CPU between control programs and connected machine subsystems
System position: Acts as the SINUMERIK 840D CPU between control programs and connected machine subsystems
Upstream / inputs: CNC programs, PLC logic, and 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 573.4 unit.

Evidence ledger

Facts, inferences, and unknowns are kept separate.

Facts

Siemens identifies 6FC5357-0BB34-0AA0 as a SINUMERIK 840D NCU 573.4.
Confidence: high
- support.industry.siemens.com — retrieved 2026-09-12; high confidence
Processes CNC, PLC, and communication tasks for a SINUMERIK 840D machine
Confidence: high
- support.industry.siemens.com — retrieved 2026-09-12; high confidence
- support.industry.siemens.com — retrieved 2026-09-12; high confidence

Inferences

Acts as the SINUMERIK 840D CPU between control 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
- support.industry.siemens.com — retrieved 2026-09-12; high confidence

Unknowns

Unknown: the firmware, installation configuration, and condition of an individual SINUMERIK 840D NCU 573.4 unit.
Confidence: low
Missing evidence: The sources describe the product family but do not inspect an individual unit.

System position diagram

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

View Mermaid source

flowchart LR\n upstream["CNC programs, PLC logic, and communication data enter the NCU"] --> product["6FC5357-0BB34-0AA0"]\n product --> downstream["The NCU sends processed control data to connected machine subsystems"]

View diagram labels

Nodes: CNC programs, PLC logic, and communication data enter the NCU; 6FC5357-0BB34-0AA0; The NCU sends processed control data to connected machine subsystems
Edges: Documented input path; Documented output path

Next action

The captured evidence supports publishing 6FC5357-0BB34-0AA0 as SINUMERIK 840D NCU 573.4.

Confirm the installed system configuration and unit condition before commissioning.

Request help with this reference

Provide the exact reference, machine context, and observed symptom so the next review can stay evidence-based.

Submission is unavailable until durable storage is verified.

Reference or description *Recovery mode *Country *RegionEmail *Phone

I’m unsure of the exact reference or route; keep my description for human qualification.

Add context only if useful

ManufacturerMachine or lineComponent typeUrgencyProduction impactQuantityAcceptable conditionNeed byPreferred contact

Technical context

What is known so far?

Optional updatesNotify me when the supplier price changesSubscribe to the ardkor.org newsletter

This may be safety-sensitive or emergency-related; hold it for human handling.Allow anonymous landing and source categories to be saved with this request for analytics. This is optional and separate from routing.

Recipient and data disclosure

Named recipient: Ardkor human-qualification queue (internal local preview). No partner delivery is enabled here.

Data retained for this review: reference, selected route, location, technical context, contact details, consent state, and any accepted private attachment.

Response expectation: none is promised. If external routing is enabled later, the partner name, disclosed fields, and response expectation must be shown and accepted again.

Withdrawal and deletion: use the private request controls from the receipt to withdraw further processing or request access/deletion. The request remains recorded until the relevant Ardkor systems and any recipient confirm completion.

External routing consent: I separately authorize Ardkor to use this request for human qualification in the named internal queue. No external partner is authorized by this checkbox.

Read the privacy information before sending. For corrections, access, or deletion help, use the contact page or email reference@ardkor.org; mailbox delivery and attendance have not been verified.

This routing state is separate from watch, marketing, payment, and analytics choices. If no capable service match is found, the request remains a human-qualification lead and is never presented as provider acceptance. Ardkor is not an emergency or safety service and submission does not guarantee availability, price, repair, sourcing, or response.