CNC Machine Tool Control Solution – SIEMENS 6FC5357-0BY21-1AE1 NCU572.2 | NCU 572 Series
Where This Product Is Used
The SIEMENS NCU572.2 (6FC5357-0BY21-1AE1) is the central processor module of the SINUMERIK 840D sl CNC platform, deployed across the most demanding machine tool environments globally:
- Multi-axis machining centers – 5-axis milling, turn-mill, and horizontal boring machines requiring coordinated interpolation across 6–31 axes
- High-speed grinding machines – precision surface and cylindrical grinders where sub-micron path accuracy is critical
- Gear cutting & hobbing machines – synchronous multi-spindle operations with electronic gearbox functions
- Large-format gantry & portal machines – aerospace structural part machining with extended travel and thermal compensation
- Automotive transfer lines – high-throughput production cells integrating robotics, conveyors, and CNC in a unified PROFINET network
- Medical device manufacturing – bone implant and surgical instrument machining requiring ISO 13485-traceable process control
Technical Specifications
| Part Number | 6FC5357-0BY21-1AE1 |
| Model | NCU572.2 |
| Series | NCU 572 / SINUMERIK 840D sl |
| Manufacturer | SIEMENS AG |
| CPU Architecture | Intel Celeron M 600 MHz (NC core) + integrated PLC (S7-300 compatible) |
| Max. Interpolation Axes | Up to 6 axes / 6 spindles per NCU (expandable via NX) |
| Drive Interface | DRIVE-CLiQ (up to 2 lines) |
| Communication | PROFINET IO (2-port switch), Industrial Ethernet, USB 2.0 |
| Onboard Memory | 256 MB DRAM; CompactFlash slot for NC/PLC programs |
| Operating Voltage | 24 V DC (via NX/NX10 or standalone) |
| Operating Temperature | 0 °C to +55 °C |
| Protection Class | IP20 |
| Dimensions (W×H×D) | 50 mm × 380 mm × 270 mm (approx.) |
| Weight | ~1.9 kg |
| Certifications | CE, UL, cUL, RoHS |
Why Engineers Specify This Model
- Integrated NC + PLC in one unit – eliminates the separate S7-300 rack, reducing cabinet footprint and wiring complexity by up to 40%
- DRIVE-CLiQ topology – single-cable connection to SINAMICS S120 drives carries power, encoder data, and diagnostics, cutting commissioning time significantly
- Scalable axis count – pair with NX10.3 or NX15.3 expansion modules to grow from 6 to 31 interpolating axes without changing the NCU
- Proven field reliability – SINUMERIK 840D sl is installed on over 500,000 machine tools worldwide; the NCU572.2 is the mid-range workhorse of the platform
- Seamless TIA Portal integration – PLC programming via STEP 7 or TIA Portal V15+; NC programming via ShopMill/ShopTurn or ISO G-code
- Long-term availability – SIEMENS maintains spare parts and firmware support for SINUMERIK 840D sl through 2030+
Complete System Bill of Materials
A typical SINUMERIK 840D sl control cabinet built around the NCU572.2 includes:
- NCU572.2 (6FC5357-0BY21-1AE1) – this unit
- NX10.3 or NX15.3 axis expansion module (6FC5357-0BY32-0AE0 / 6FC5357-0BY33-0AE0)
- SINAMICS S120 Booksize power module (e.g., 6SL3130-7TE21-6AA3)
- SINAMICS S120 motor modules (6SL3120-series, per axis)
- SIMOTICS servo motors with DRIVE-CLiQ encoder (1FK7 / 1FT7 series)
- OP 010 / OP 015 operator panel (6FC5203-0AF02-0AA1)
- TCU30.3 thin client unit (6FC5312-0DA00-0AA0)
- 24 V DC SITOP power supply (6EP1334-series)
- CompactFlash card for NC/PLC data backup (6FC5850-series)
Compliance & Industry Standards
- CE Marking – compliant with EU Machinery Directive 2006/42/EC and Low Voltage Directive 2014/35/EU
- UL / cUL Listed – recognized for North American industrial control panel applications
- RoHS 2 (2011/65/EU) – restricted hazardous substances compliant
- IEC 61131-3 – PLC programming language standard (Ladder, FBD, STL)
- PROFINET Conformance Class B – certified real-time Ethernet communication
- ISO 9001 – manufactured under SIEMENS AG certified quality management system
Quality Assurance & Sourcing
- All units are sourced from authorized SIEMENS distribution channels or verified surplus with full traceability documentation
- Each module undergoes functional power-on verification and firmware version check prior to shipment
- Packaging follows SIEMENS ESD-safe standards with anti-static bags, foam cushioning, and humidity indicators
- Serial number and date code are recorded and provided with every order for warranty and service tracking
- Konmask.com maintains a no-counterfeit policy – units failing authentication are rejected and not listed
How to Source This Part
Ready to order or need a formal quotation?
- Online: Add to cart directly on Konmask.com – secure checkout with DHL / FedEx / UPS international shipping
- Email RFQ: support@konmask.com – include your required quantity, delivery timeline, and destination country
- Phone / WhatsApp: +0086 19859288691 – available Mon–Sat, 09:00–18:00 CST
- Lead time: In-stock units ship within 1–2 business days; ex-stock orders quoted within 24 hours
- Payment: T/T wire transfer, PayPal, credit card (Visa / Mastercard)
Application-Specific FAQ
Q: Is the NCU572.2 compatible with SINUMERIK 840D (non-sl) systems?
A: No. The NCU572.2 is designed exclusively for the SINUMERIK 840D sl (solution line) platform. It is not backward-compatible with the classic 840D CCU/NCU hardware.
Q: How many axes can the NCU572.2 control without expansion modules?
A: Up to 6 interpolating axes and 6 spindles natively. Adding NX10.3/NX15.3 modules extends this to a maximum of 31 axes per NCU.
Q: Can I use this module as a direct replacement for a failed NCU571.2 or NCU573.2?
A: The NCU572.2 is the mid-range variant. Replacing an NCU571.2 (lower spec) is generally possible with a software license upgrade; replacing an NCU573.2 (higher spec) requires verifying that the reduced axis/spindle count meets your machine’s requirements. Always consult your machine OEM documentation.
Q: What CompactFlash card is required for NC/PLC data?
A: SIEMENS recommends the 6FC5850-series industrial CompactFlash cards. Standard commercial CF cards are not supported and may cause data integrity issues.
Q: Do you provide a warranty?
A: Yes. Konmask.com offers a 12-month warranty on all verified units covering manufacturing defects and functional failures under normal operating conditions.
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Contact: support@konmask.com | +0086 19859288691
