Siemens NCU572.2 SINUMERIK Numerical Control Unit
A legacy SINUMERIK 840D powerline NCU designation whose exact hardware, software and PROFIBUS execution depend on the full 6FC order number.
Key Information
NCU572.2 is a Siemens SINUMERIK 840D powerline numerical control unit designation. Siemens documentation lists multiple NCU 572.2 order-number executions, including standard or export versions, PROFIBUS and digitizing variants, and hardware supplied without system software.
The front designation is therefore not sufficient for substitution. The complete 6FC article number, hardware version, system software, PLC configuration, memory card and drive-bus context must be preserved.
Functions
- Combines CNC and PLC processing for a SINUMERIK 840D powerline control configuration.
- Coordinates NC functions, machine PLC logic and the installed drive and I/O architecture.
- Supports variant-dependent PROFIBUS DP and digitizing functions documented by the complete order number.
- Uses the installed system-software and machine-data set as part of the working control identity.
Specifications
| Manufacturer | Siemens |
|---|---|
| Model Designation | NCU572.2 |
| Control Family | SINUMERIK 840D powerline |
| Article Number | Multiple 6FC5357 variants; read the full nameplate |
| Documented PLC Basis | PLC 315-2 DP class for several NCU 572.2 executions |
| System Software | Variant- and machine-specific |
| PROFIBUS DP | Available on designated order-number variants |
| Digitizing Function | Available on designated order-number variants |
| Memory / Axis Capacity | Confirm from the exact 6FC article and software release |
| Replacement Inputs | NCU label, memory card, software, machine data and hardware configuration |
Installation
- Back up NC, PLC, drive and machine data using the service process supported by the installed software release.
- Record the full 6FC article number, hardware version, memory card, option data and all connected interfaces.
- Use the correct NCU box, battery, fan, power supply and grounding arrangement for the installed control.
- Restore software and archives only to verified compatible hardware, then validate axes and safety-related machine functions under controlled conditions.
Lifecycle
- Treat NCU572.2 as a legacy powerline platform and plan spare, repair or migration strategy around the complete machine.
- Keep the original memory media and backups protected, labeled and linked to the machine serial record.
- Do not substitute another NCU 572 or 573 variant from the front name alone.
FAQ
Why is the full 6FC number required for NCU572.2?
It distinguishes standard, export, PROFIBUS, digitizing and software-supply variants that share a similar front designation.
Can an NCU572.2 replacement use any available memory card image?
No. Hardware version, system software, license and machine archive must be compatible with the exact control and machine configuration.
What backup is required before removing NCU572.2?
Preserve NC and PLC archives, drive data, machine data, tool and user data, option records and the original memory media where serviceable.
Can NCU572.2 be replaced by an 840D sl NCU without engineering?
That is a platform migration involving hardware, software, drives, I/O, HMI, safety and machine validation rather than a direct board swap.
Which photographs help identify NCU572.2 correctly?
Capture the complete front and side labels, 6FC article number, hardware version, memory card, NCU box and every connected interface.
What acceptance work follows an NCU572.2 exchange?
Validate boot and licensing, PLC state, axes, feedback, limits, I/O, HMI, alarms, communications and the machine maker’s safety sequence.
