CNC Machine Tool Control Solution – Siemens 6FC5370-8AA20-0AA0 | SINUMERIK 840D sl NCU 720.2
Where This Product Is Used
The Siemens 6FC5370-8AA20-0AA0 is the NCU 720.2 Numerical Control Unit at the heart of the SINUMERIK 840D sl platform — Siemens’ flagship open-architecture CNC system. It is deployed across the most demanding machine tool applications in global manufacturing:
- Multi-axis machining centers — 3- to 5-axis milling, boring, and drilling machines requiring simultaneous interpolation and high-speed contouring
- CNC turning centers & lathes — High-precision turning with C-axis and live tooling, including Swiss-type and multi-spindle configurations
- Grinding machines — Cylindrical, surface, and profile grinding with adaptive feed control and in-process gauging integration
- Gear cutting & hobbing machines — Electronic gearbox (EGB) synchronization for hobbing, shaping, and skiving operations
- Laser cutting & plasma systems — High-dynamic path control for 2D/3D laser cutting with real-time power regulation
- Automotive body & powertrain lines — Transfer lines, flexible manufacturing cells, and robotic integration in Tier 1 automotive plants
- Aerospace structural machining — Large-format 5-axis machining of aluminum and titanium structural components
- Medical device manufacturing — Micro-machining of implants and surgical instruments requiring sub-micron accuracy
Technical Specifications
| Part Number | 6FC5370-8AA20-0AA0 |
| Series | SINUMERIK 840D sl |
| Module Type | NCU 720.2 — Numerical Control Unit |
| Manufacturer | Siemens AG |
| Axes Capacity | Up to 31 axes / 10 channels |
| Processor | Intel Celeron M, 600 MHz |
| DRAM | 256 MB |
| CompactFlash | 1 GB (system CF card) |
| DRIVE-CLiQ Ports | 6 × DRIVE-CLiQ interfaces |
| Ethernet Ports | 2 × Industrial Ethernet (X120, X130) |
| PROFIBUS DP | 2 × DP interfaces (X126, X136) |
| USB | 2 × USB 2.0 (front panel) |
| Power Supply | 24 V DC (via NX/NX-D or integrated) |
| Operating Temperature | 0 °C to +55 °C |
| Storage Temperature | -40 °C to +70 °C |
| Protection Class | IP20 |
| Weight | approx. 4.7 kg |
| Dimensions (W×H×D) | approx. 300 × 380 × 220 mm |
| Firmware | SINUMERIK Operate (NCK + PLC integrated) |
Why Engineers Specify This Model
- Integrated NCK + PLC architecture — The NCU 720.2 combines the Numerical Control Kernel (NCK) and SIMATIC S7-300 compatible PLC on a single module, eliminating inter-unit communication latency and reducing cabinet footprint.
- DRIVE-CLiQ digital drive bus — Plug-and-play commissioning of SINAMICS S120 drives with automatic parameter upload; eliminates manual encoder configuration.
- Open Linux-based platform — Supports OEM-specific HMI customization, third-party application integration, and Industry 4.0 data connectivity via OPC UA.
- High-speed interpolation — IPO cycle down to 1 ms enables smooth 5-axis contouring at high feed rates with minimal contour error.
- Scalable channel configuration — Up to 10 independent machining channels allow complex multi-spindle and multi-slide machines to be controlled from a single NCU.
- Proven global installed base — Tens of thousands of units deployed in automotive, aerospace, and precision engineering worldwide since 2006.
Complete System Bill of Materials
A fully operational SINUMERIK 840D sl system based on the NCU 720.2 typically includes:
- NCU 720.2 — 6FC5370-8AA20-0AA0 (this unit) — Numerical Control Unit
- NX 10.3 / NX 15 — 6FC5371-0AA10-0AA0 / 6FC5371-0AA20-0AA0 — Axis Extension Modules (per additional axis group)
- SINAMICS S120 CU320-2 DP/PN — 6SL3040-1MA01-0AA0 — Drive Control Unit
- SINAMICS S120 ALM / SLM — Active Line Module or Smart Line Module (power rating per machine)
- SINAMICS S120 Motor Modules — Single-axis or double-axis (booksize format)
- SIMOTICS S-1FK7 / 1FT7 Servo Motors — With DRIVE-CLiQ encoder interface
- OP 010 / OP 015 / OP 019 HMI Panel — 6FC5203-0AF02-0AA0 series — Operator Panel
- PCU 50.5 — 6FC5210-0DF04-0AA0 — Panel Control Unit (if separate HMI PC required)
- MCP 483C PN — 6FC5303-0AF22-0AA0 — Machine Control Panel
- 24 V DC Power Supply — SITOP PSU100S or equivalent, ≥10 A
Compliance & Industry Standards
- CE Marking — Compliant with EU Machinery Directive 2006/42/EC and Low Voltage Directive 2014/35/EU
- UL / cUL Listed — UL 508A Industrial Control Equipment
- IEC 61800-5-1 — Safety requirements for adjustable speed electrical power drive systems
- IEC 62061 / ISO 13849-1 — Functional safety (SIL 2 / PLd capable with SINUMERIK Safety Integrated option)
- RoHS 2011/65/EU — Restriction of hazardous substances compliant
- REACH Regulation (EC) No 1907/2006 — Compliant
- EMC Directive 2014/30/EU — EN 61000-6-2 (immunity) / EN 61000-6-4 (emission)
Quality Assurance & Sourcing
At Konmask.com, every Siemens 6FC5370-8AA20-0AA0 unit is subject to our multi-stage verification process before dispatch:
- ✅ Visual inspection — Connector pins, housing integrity, label authenticity, and firmware version verification
- ✅ Functional power-on test — NCK boot sequence, PLC initialization, and DRIVE-CLiQ port enumeration confirmed
- ✅ Counterfeit screening — Cross-referenced against Siemens serial number database and hologram authentication
- ✅ ESD-safe packaging — Shipped in anti-static foam-lined cartons with desiccant and shock indicators
- ✅ Traceability documentation — Certificate of conformity and test report available on request
We source from authorized Siemens distributors, OEM decommissions, and certified repair partners. Condition (new, refurbished, or surplus) is clearly stated on each listing.
How to Source This Part
- Add to cart and complete checkout — we accept T/T bank transfer, PayPal, and major credit cards.
- Request a quote — For volume orders (2+ units) or project BOM sourcing, email support@konmask.com for preferential pricing.
- Lead time — In-stock units ship within 1–3 business days. Ex-stock orders confirmed same day.
- Global shipping — DHL Express, FedEx International Priority, and UPS Worldwide available. Export documentation (commercial invoice, packing list, CO) provided.
- Warranty — 12-month warranty against manufacturing defects. DOA replacement within 7 days of receipt.
Application-Specific FAQ
Q: Is the 6FC5370-8AA20-0AA0 compatible with SINUMERIK 840D (non-sl) systems?
A: No. The NCU 720.2 is exclusively for the SINUMERIK 840D sl (solution line) platform. It is not backward-compatible with the classic 840D CCU/NCU 572/573 hardware.
Q: Can this NCU run SINUMERIK Operate (ShopMill / ShopTurn)?
A: Yes. SINUMERIK Operate with ShopMill and ShopTurn graphical programming environments is fully supported and can be loaded onto the integrated CompactFlash card.
Q: What SINAMICS drive versions are compatible?
A: SINAMICS S120 with firmware V2.6 and above. DRIVE-CLiQ topology must be configured via STARTER or Siemens TIA Portal with SCOUT add-in.
Q: Do I need a separate PLC for machine I/O?
A: No. The NCU 720.2 integrates a SIMATIC S7-300 compatible PLC (up to 256 KB work memory). For extended I/O, ET 200 distributed I/O via PROFIBUS DP or PROFINET is supported.
Q: Can I retrofit this NCU into an existing 840D sl machine?
A: Yes, provided the existing machine uses SINUMERIK 840D sl hardware. NCK and PLC software backup from the original NCU must be restored. Konmask can advise on compatibility — contact us with your machine’s existing NCU part number.
Q: Is Safety Integrated (SI) supported?
A: Yes. SINUMERIK Safety Integrated (SIL 2 / PLd) is supported with the appropriate license and SINAMICS S120 Safety modules. Safe Torque Off (STO), Safe Stop 1 (SS1), and Safe Operating Stop (SOS) functions are available.
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