Siemens 6FC5247-0AA00-0AA1 Sinumerik 840D NCU-box Chassis
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Product Information
The Siemens 6FC5247-0AA00-0AA1 Sinumerik 840D NCU-box is a specialized chassis enclosure designed to house and power numerical control unit processor cards within SINUMERIK 840D and 840DE CNC systems. Serving as the primary physical mounting and power distribution frame, this housing module supports Siemens NCU 571, NCU 571.2, NCU 572, NCU 572.2, and NCU 573 processor cards. Measuring 280 x 80 x 92 mm and weighing 3.80 kg, the unit provides a compact, robust enclosure tailored for demanding metalworking, automotive manufacturing, aerospace machining, and general industrial automation environments.
Electrical power for the installed processor card is delivered through an internal power supply unit that links directly to SIMODRIVE 611 infeed modules via the SIMODRIVE device bus. The enclosure incorporates an integrated RAM buffer battery to safeguard volatile SRAM memory, preventing the loss of critical NC programs, machine parameters, and zero offsets during system power-downs or electrical interruptions. When exchanging processor cards or replacing the enclosure, maintaining continuous battery backing ensures parameter preservation and avoids lengthy controller re-commissioning. For complex maintenance or system restores, ABC Industrial Parts can support technical teams in sourcing verified replacement hardware and managing unit swaps effectively.
Thermal management within the 6FC5247-0AA00-0AA1 is handled by an integrated forced-air cooling fan assembly, which prevents processing-intensive NCU boards from experiencing thermal throttling or hardware failure under continuous production loads. First-line operational checks for the assembly should verify clean airflow paths, proper mechanical seating of the NCU processor card, and adequate backup battery voltage before restoring main power. Because power conversion and cooling pathways are integrated directly into the chassis hardware, hardware degradation or fan failures are best resolved by replacing the chassis or securing a fully tested exchange unit from ABC Industrial Parts to restore machine tool availability quickly.
Technical Specifications
| Manufacturer | Siemens |
| Part Number | 6FC5247-0AA00-0AA1 |
| Model / Type | Sinumerik 840D NCU-box |
| Component Type | NCU Chassis Enclosure |
| Product Family | SINUMERIK |
| Compatible NCU Modules | NCU 571, NCU 571.2, NCU 572, NCU 572.2, NCU 573 |
| Power Supply Connection | Powered via SIMODRIVE infeed module device bus |
| Memory Backup | Integrated RAM buffer battery for SRAM data retention |
| Cooling System | Integrated forced-air cooling fan module |
| Dimensions (H x W x D) | 280 x 80 x 92 mm |
| Weight | 3.80 kg |
Replacement and Spare Part Considerations
When replacing a Siemens 6FC5247-0AA00-0AA1 NCU-box, technicians must ensure that the installed NCU processor card—whether an NCU 571, 572, or 573 series board—is seated correctly into the internal backplane interface and secured against vibration. Before removing power or extracting processor cards, backup procedures should be performed or a fresh buffer battery confirmed to ensure that SRAM data, zero-point offsets, and machine parameters remain fully intact during the swap.
Mechanical compatibility across the SINUMERIK 840D and 840DE control product family requires verifying that the device bus power connections to adjacent SIMODRIVE modules are clean and correctly linked. Although designated in phase-out status by the manufacturer and succeeded by part number 6FC5247-0AA00-0AA2, the 6FC5247-0AA00-0AA1 remains a drop-in replacement for existing machine tool installations, allowing seamless hardware service without requiring modifications to mounting footprints or cabinet wiring.
Frequently Asked Questions
What NCU processor modules are compatible with the Siemens 6FC5247-0AA00-0AA1 NCU-box?
The 6FC5247-0AA00-0AA1 chassis supports Siemens NCU 571, NCU 571.2, NCU 572, NCU 572.2, and NCU 573 processor cards within SINUMERIK 840D and 840DE CNC systems.
How does the 6FC5247-0AA00-0AA1 protect NC machine data during power loss?
The enclosure includes an integrated RAM buffer battery that supplies backup power to retain volatile SRAM data, NC program parameters, and machine zero offsets when main power is turned off.
How is power provided to the 6FC5247-0AA00-0AA1 NCU-box?
The integrated power supply unit within the enclosure draws power directly through the SIMODRIVE device bus link from connected SIMODRIVE infeed modules.
Does the 6FC5247-0AA00-0AA1 include active cooling?
Yes, the unit features an integrated forced-air cooling fan assembly designed to dissipate heat generated by processing-intensive NCU cards and prevent thermal overload.
What is the official successor part for the Siemens 6FC5247-0AA00-0AA1?
Siemens designated part number 6FC5247-0AA00-0AA2 as the successor to the 6FC5247-0AA00-0AA1 NCU-box module.
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Specific firmware and hardware versions
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Disclaimer:
We are not an authorised distributor of Siemens.
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