SIEMENS NCU572.2 (6FC5357-0BB21-0AE0) Numerical Control Unit – Sinumerik 840D Series
When a CNC machining center loses its Numerical Control Unit, the entire production line comes to a standstill. Spindles stop, axes freeze, and every minute of downtime translates directly into lost revenue and missed delivery commitments. In high-precision manufacturing environments — aerospace, automotive, mold-making — there is no workaround: the NCU is the brain of the machine, and without it, nothing moves.
The SIEMENS NCU572.2 (Part No. 6FC5357-0BB21-0AE0) is a high-performance Numerical Control Unit within the renowned Sinumerik 840D platform — SIEMENS’ flagship open-architecture CNC system that has set the global benchmark for multi-axis precision machining since its introduction. The NCU572.2 occupies the mid-to-high tier of the 840D NCU family, delivering the processing power and I/O capacity required for complex 5-axis contouring, high-speed cutting, and coordinated multi-channel operations. It is deployed in tens of thousands of machine tools worldwide, from German machining centers to Japanese transfer lines.
Technical Specifications
- Part Number: 6FC5357-0BB21-0AE0
- Model: NCU572.2
- Series: Sinumerik 840D
- Manufacturer: SIEMENS AG
- Unit Type: Numerical Control Unit (NCU)
- Weight: 4,500 g (approx.)
- Communication: PROFIBUS DP, MPI
- Compatible Drive System: SIMODRIVE 611D / SINAMICS S120 (via adapter)
- Operating System: Sinumerik 840D real-time OS
- Condition Available: New / Refurbished / Exchange
Note: All specifications are based on SIEMENS official documentation. Konmask.com does not fabricate or alter technical data.
Key Features & Benefits
- High-Speed Processing: Capable of handling complex multi-axis interpolation with minimal cycle times, critical for high-speed die and mold machining.
- Open Architecture: The Sinumerik 840D platform supports Windows-based HMI customization, enabling OEM-specific operator interfaces without hardware changes.
- Integrated PLC: Built-in SIMATIC S7-300 compatible PLC eliminates the need for a separate programmable controller, reducing panel space and wiring complexity.
- PROFIBUS DP Integration: Native PROFIBUS DP master port enables seamless connection to distributed I/O, drives, and field devices across the machine.
- Proven Reliability: The 840D NCU family is engineered for 24/7 industrial operation with robust EMC shielding and wide operating temperature tolerance.
- Direct Replacement: The NCU572.2 is a direct form-fit-function replacement for failed units in existing Sinumerik 840D installations, minimizing re-commissioning time.
Industry & Equipment Applications
- Aerospace Manufacturing: 5-axis machining of turbine blades, structural frames, and precision housings.
- Automotive & Tier-1 Suppliers: Transfer lines, cylinder head machining, and powertrain component production.
- Mold & Die Industry: High-speed HSC milling of complex cavity geometries requiring sub-micron surface finish.
- General Precision Machining: Turning centers, grinding machines, and multi-spindle machining centers.
- Medical Device Manufacturing: Orthopedic implant machining requiring tight tolerances and full traceability.
System Integration & Compatible Parts
The NCU572.2 operates within the broader Sinumerik 840D ecosystem. Commonly paired components include:
- MMC / PCU: PCU50, PCU20 — HMI computing units for operator panel integration
- Drive System: SIMODRIVE 611D axis drive modules
- I/O Modules: PP72/48 peripheral I/O boards for machine signal interfacing
- Power Supply: Sinumerik 840D NE/NE power supply modules
- Communication: Compatible with PROFIBUS DP field devices and MPI programming interfaces
Contact our technical team to verify compatibility with your specific machine configuration before ordering.
Our Quality Assurance Process
- ✅ Source Verification: All units are sourced from authorized channels or certified refurbishers with full traceability.
- ✅ Functional Testing: Each NCU is bench-tested for power-on, communication bus integrity, and basic axis control response prior to shipment.
- ✅ Anti-Static Packaging: Units are shipped in ESD-safe packaging with foam cushioning to prevent transit damage.
- ✅ Documentation: Shipment includes part identification label, test record, and packing list. CE/RoHS documentation available on request.
How to Order
- Submit an Inquiry: Use the contact form on this page or email support@konmask.com with your required quantity and delivery timeline.
- Receive a Quote: Our team will respond within 1 business day with pricing, lead time, and stock availability.
- Confirm & Pay: We accept T/T bank transfer, PayPal, and other B2B payment methods. Pro-forma invoice issued upon order confirmation.
- Shipping: DHL, FedEx, UPS express available worldwide. Sea freight for bulk orders. Export documentation provided.
Why Choose Konmask.com?
- 🏭 Industrial Automation Specialists: We focus exclusively on PLC, DCS, CNC, and industrial drive components — not a general electronics marketplace.
- 🌍 Global B2B Supply: Serving maintenance engineers, MRO buyers, and OEM integrators across 50+ countries.
- ⚡ Fast Response: Dedicated technical sales team responds to all inquiries within 24 hours.
- 📦 Reliable Logistics: Experienced in export compliance, customs documentation, and time-critical emergency shipments.
- 🔒 Secure Transactions: All orders backed by written commercial terms and quality guarantees.
Frequently Asked Questions
- Q: Is the 6FC5357-0BB21-0AE0 a new or refurbished unit?
- A: We offer both new and professionally refurbished units. Please specify your preference when submitting an inquiry, and we will confirm availability and pricing for each condition.
- Q: Can the NCU572.2 replace an NCU571.2 or NCU573.2 in my machine?
- A: Cross-model replacement within the 840D NCU family requires careful verification of software version, axis count, and drive interface compatibility. Please contact our technical team with your machine model and current NCU part number before ordering.
- Q: Do you provide the Sinumerik 840D software license with the NCU?
- A: Software licensing for Sinumerik 840D is managed by SIEMENS. We can advise on the licensing process, but the license must be obtained through official SIEMENS channels or transferred from the original machine with proper authorization.
- Q: What is the lead time for the NCU572.2 6FC5357-0BB21-0AE0?
- A: Lead time varies by stock availability. In-stock units typically ship within 2–3 business days. For sourced units, lead time is 1–3 weeks. Contact us for a real-time availability check.
- Q: Do you ship to my country?
- A: Yes. We ship globally via DHL, FedEx, and UPS. We handle all export documentation including commercial invoice, packing list, and certificate of origin where required.
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