Siemens 6FC5371-0AA10-0AA2 SINUMERIK 840D sl NCU 710.2 CNC Hardware
01Product Profile
Siemens 6FC5371-0AA10-0AA2 is SINUMERIK 840D sl NCU 710.2 CNC hardware with an integrated PLC 317-2DP. The spare-part unit provides 3 MB of CNC user memory and 512 KB of PLC user memory and uses internal heat dissipation. Siemens safety documentation identifies the exact article as NCU 710.2 with PLC 317-2DP, so it should not be confused with NCU 720.2 or with later NCU 710.3 PN hardware.
02Technical Data
| Manufacturer | Siemens |
|---|---|
| Article Number | 6FC5371-0AA10-0AA2 |
| Product Family | SINUMERIK 840D sl |
| Product Designation | NCU 710.2 |
| Component Type | CNC hardware / numerical control unit |
| Integrated PLC | PLC 317-2DP |
| CNC User Memory | 3 MB |
| PLC User Memory | 512 KB |
| Heat Dissipation | Internal |
| Generation | NCU 7x0.2 |
| Commercial Position | Spare part |
03System Role
Control Function
- Executes CNC control functions in a compatible SINUMERIK 840D sl installation.
- Runs the integrated PLC 317-2DP program for machine sequencing and field coordination.
- Coordinates the configured drives, I/O, operator interface and machine communications.
- Provides the NCU 710.2 memory and cooling design required by the installed system.
- Serves as a spare-part core for machines that retain the NCU 7x0.2 generation.
Key Capabilities
- Combines the 840D sl CNC core and PLC 317-2DP in one numerical control unit.
- Three megabytes of CNC user memory support the documented NCU 710.2 control configuration.
- The integrated PLC provides 512 KB of user memory.
- Internal heat dissipation defines the cooling arrangement for the exact article.
- Official Siemens safety documentation identifies the full order number as NCU 710.2, preventing confusion with NCU 720.2.
- The hardware supports the established NCU 7x0.2 system architecture and its documented interfaces and terminal assignments.
04Compatibility
- Match the complete 6FC5371-0AA10-0AA2 order number and NCU 710.2 designation.
- Confirm the installed SINUMERIK CNC software release, CompactFlash card, licenses and machine archive.
- Verify PLC 317-2DP configuration, PROFIBUS parameters, I/O addressing and bus termination.
- Retain the documented NCU 7x0.2 terminal assignment; NCU 7x0.3 terminal assignments differ.
- Confirm the internal heat-dissipation arrangement and required cabinet airflow.
- Do not treat NCU 720.2 or NCU 710.3 PN as drop-in replacements without a complete migration review.
05Applications
- Spare-part replacement in compatible SINUMERIK 840D sl NCU 710.2 systems.
- Maintenance of CNC machines using an integrated PLC 317-2DP architecture.
- Restoration of NC and PLC processing after a diagnosed NCU failure.
- Lifecycle stock for installed NCU 7x0.2 controls.
- Service work where CNC and PLC user-memory levels must match the existing project.
- Migration assessment that begins with a complete backup of software, licenses, PLC, NC and drive data.
06FAQ
What is Siemens 6FC5371-0AA10-0AA2?
It is SINUMERIK 840D sl NCU 710.2 CNC hardware with an integrated PLC 317-2DP.
How much user memory is provided?
The exact article is identified with 3 MB of CNC user memory and 512 KB of PLC user memory.
Which cooling arrangement is specified?
Siemens identifies internal heat dissipation for this order number.
Is this an NCU 720.2?
No. Official Siemens records identify the exact article as NCU 710.2.
Can an NCU 7x0.3 be installed without changes?
No automatic compatibility is assumed; terminal assignments, interfaces, software and the complete machine project require review.
What must be tested after replacement?
Validate CNC startup, PLC operation, drives, field I/O, operator functions, communications, diagnostics and required safety functions.
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