SIEMENS 6FC5357-0BB24-0AA0 Sinumerik 840D sl NCU 720.2 Processor Module | Replacement, Equivalent & Selection Guide
The SIEMENS 6FC5357-0BB24-0AA0 is a Sinumerik 840D sl NCU 720.2 Processor Module designed for high-performance CNC machine tool control. This unit serves as the central processing core of the Sinumerik 840D sl system, integrating NC, PLC, and communication functions into a single compact module. Whether you are sourcing an original replacement, evaluating compatible equivalents, or selecting the right NCU variant for your application, this guide covers everything you need.
Technical Specifications
- Part Number / SKU: 6FC5357-0BB24-0AA0
- Brand: SIEMENS
- Series: Sinumerik 840D sl
- Module Type: NCU 720.2 Processor Module
- Integrated Functions: NC control, PLC (SIMATIC S7-300 compatible), communication interfaces
- Drive Interface: DRIVE-CLiQ
- Ethernet Interfaces: 2× Industrial Ethernet (IE)
- USB Interface: 1× USB 2.0
- CompactFlash Slot: Yes (for NC software and user data)
- Max. Axes / Spindles: Up to 6 axes / 3 spindles (NCU 720.2 class)
- Operating Voltage: 24 V DC
- Weight: Approx. 4.46 kg
- Condition: New / Refurbished available
- MPN: 6FC5357-0BB24-0AA0
Compatible Replacement & Equivalent Models
If the 6FC5357-0BB24-0AA0 is unavailable or you require an upgraded alternative, the following models are functionally compatible or serve as direct replacements within the Sinumerik 840D sl NCU 720 family:
- 6FC5357-0BB23-0AA0 — NCU 720.1, predecessor version, reduced axis count
- 6FC5357-0BB25-0AA0 — NCU 720.3, successor with enhanced performance
- 6FC5357-0BB34-0AA0 — NCU 730.2, higher-end variant for complex multi-axis applications
- 6FC5357-0BB35-0AA0 — NCU 730.3, top-tier NCU for demanding machining centers
Note: Always verify firmware version compatibility and axis license requirements before substituting NCU modules. Contact our team for a free compatibility check.
Why Choose the Original Model
- Guaranteed Compatibility: Drop-in replacement for existing Sinumerik 840D sl installations — no re-engineering required.
- Proven Reliability: SIEMENS industrial-grade components rated for continuous 24/7 operation in harsh environments.
- Software Continuity: Retains existing NC programs, PLC logic, and machine parameters when replacing a like-for-like unit.
- OEM Support: Full SIEMENS service and spare parts ecosystem backing.
- Lifecycle Assurance: Sinumerik 840D sl is a long-lifecycle platform with extended support commitments from SIEMENS.
Typical Applications
- CNC milling machines and machining centers
- CNC turning centers and lathes
- Grinding machines
- Multi-axis simultaneous machining systems
- Gear cutting and special-purpose machine tools
- Retrofit and modernization of legacy Sinumerik 840D (non-sl) systems
System Compatibility
- Control System: Sinumerik 840D sl
- Drive System: SINAMICS S120 (via DRIVE-CLiQ)
- PLC Platform: SIMATIC S7-300 (integrated)
- HMI: Sinumerik Operate (PCU 50.5 / TCU / Thin Client)
- Engineering Software: SIEMENS STARTER, SCOUT, NX CAM, Sinumerik Operate
- Communication Protocols: PROFIBUS DP, Industrial Ethernet, OPC UA (with option)
Selection Guide
Use the table below to select the correct NCU variant for your application:
- NCU 710.x — Entry-level, up to 4 axes, basic milling/turning
- NCU 720.2 (6FC5357-0BB24-0AA0) — Mid-range, up to 6 axes, standard machining centers ✔ This model
- NCU 720.3 — Mid-range enhanced, up to 8 axes, complex turning/milling
- NCU 730.x — High-end, up to 31 axes, multi-technology and 5-axis simultaneous
Key selection criteria: number of controlled axes, spindle count, required communication interfaces, and existing drive topology (SINAMICS S120 booksize vs. chassis).
Quality Assurance & Sourcing
- All units sourced from authorized distributors or verified surplus channels
- Each module undergoes functional inspection and burn-in testing prior to shipment
- Original SIEMENS packaging and documentation provided where available
- Traceability records maintained for every unit
- Warranty: 12 months from date of shipment (new units); 6 months (refurbished units)
How to Order
- Confirm your part number: 6FC5357-0BB24-0AA0
- Specify quantity and required condition (new / refurbished / exchange)
- Submit your inquiry via the product page or contact us directly
- Receive quotation within 1 business day
- Payment and shipment arranged — worldwide delivery available
📧 Email: support@konmask.com
📞 Phone / WhatsApp: +0086 19859288691
🌐 Website: https://Konmask.com
Replacement & Compatibility FAQ
Q: Can I replace 6FC5357-0BB24-0AA0 with 6FC5357-0BB25-0AA0 directly?
A: In most cases yes, but the NCU 720.3 may require a firmware update and axis license re-activation. Contact us for a compatibility assessment.
Q: Is the 6FC5357-0BB24-0AA0 compatible with SINAMICS S110 drives?
A: No. This NCU is designed for SINAMICS S120 via DRIVE-CLiQ. S110 is not supported.
Q: Can I use this module to retrofit a Sinumerik 840D (classic, non-sl)?
A: A hardware retrofit is possible but requires new cabling, drive replacement, and full recommissioning. We recommend consulting a SIEMENS-certified integrator.
Q: What CompactFlash card is required?
A: SIEMENS recommends the 6FC5313-5AG00-0AA0 (1 GB) or 6FC5313-5AG01-0AA0 (2 GB) CF cards for this NCU.
Q: Do you provide exchange / repair services?
A: Yes. We offer advance exchange and board-level repair for 6FC5357-0BB24-0AA0. Lead time: 5–10 business days.
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