SIEMENS 6SL3351-6GE33-8AB3 – Multi-Axis Drive Control Unit | SINAMICS S120 CU320-2 DP Platform
Engineering Background
The SINAMICS S120 drive system is Siemens’ flagship modular servo and vector drive platform, engineered for high-dynamic, multi-axis motion control in demanding industrial environments. The CU320-2 DP Control Unit serves as the central intelligence of the S120 system, coordinating up to six drive axes via a single compact controller with deterministic PROFIBUS DP communication.
Product Positioning
The 6SL3351-6GE33-8AB3 is a high-performance CU320-2 DP variant featuring an enhanced processor core and expanded memory, purpose-built for complex multi-axis applications in machine tools, printing presses, packaging lines, and material handling systems. It is the preferred choice for OEM machine builders and system integrators requiring scalable, IEC 61131-3-compliant motion logic with deterministic fieldbus response.
Complete Technical Specifications
- Part Number: 6SL3351-6GE33-8AB3
- Product Family: SINAMICS S120
- Module Type: Control Unit CU320-2 DP
- Fieldbus Interface: PROFIBUS DP (up to 12 Mbit/s)
- Max. Controllable Axes: Up to 6 servo / vector axes
- Processor: Enhanced dual-core ARM-based DSP
- Program Memory: 48 MB Flash
- Working Memory: 128 MB RAM
- Drive-CLiQ Ports: 4 × RJ45 Drive-CLiQ
- Digital Inputs: 8 × DI (24 V DC)
- Digital Outputs: 4 × DO (24 V DC, 100 mA)
- Analog Inputs: 2 × AI (±10 V / 0–20 mA)
- Supply Voltage: 24 V DC (20.4–28.8 V)
- Power Consumption: ≤ 30 W
- Operating Temperature: 0 °C to +55 °C
- Storage Temperature: −40 °C to +70 °C
- Protection Rating: IP20
- Dimensions (W×H×D): 73 × 380 × 270 mm
- Weight: Approx. 2.5 kg
- Firmware: SINAMICS S120 Firmware V5.x compatible
- Certifications: CE, UL, cUL, RoHS
- Country of Origin: Germany
- HS Code: 8537.10
Proven Application Environments
- Machine Tools: CNC machining centers, grinding machines, and multi-spindle lathes requiring synchronized axis control
- Printing & Packaging: Register-accurate web tension control and high-speed pick-and-place systems
- Material Handling: Automated storage and retrieval systems (AS/RS), conveyor synchronization
- Plastics & Rubber: Extruder drives, injection molding machines with multi-zone speed control
- Textile Machinery: Winding, unwinding, and draw-frame applications
- Crane & Hoist: Anti-sway control and precise load positioning
Engineering Advantages
- Centralized Multi-Axis Control: Single CU320-2 DP manages up to 6 axes, reducing cabinet footprint and wiring complexity by up to 40% versus distributed solutions
- Drive-CLiQ Topology: Automatic component recognition and parameterization via Siemens’ proprietary Drive-CLiQ serial interface eliminates manual encoder configuration
- Integrated Safety: Supports STO (Safe Torque Off) and SS1 (Safe Stop 1) safety functions per IEC 62061 / EN ISO 13849-1 without external safety relays
- STARTER / TIA Portal Integration: Full commissioning, diagnostics, and trace functionality via Siemens STARTER software or TIA Portal V16+
- Scalable Firmware: Field-upgradeable firmware supports future feature expansion without hardware replacement
- Robust EMC Design: Integrated EMC filter and shielded backplane connector ensure compliance in high-interference industrial environments
System Architecture & Signal Flow
The CU320-2 DP operates as the master controller within the SINAMICS S120 booksize or chassis format system. The signal flow is as follows:
- 1. PLC / HMI Layer: PROFIBUS DP master (e.g., SIMATIC S7-300/400/1500) sends cyclic setpoints and receives actual values at up to 12 Mbit/s
- 2. CU320-2 DP: Executes closed-loop speed/torque algorithms, distributes setpoints to individual Motor Modules via Drive-CLiQ
- 3. Motor Modules (SMM/DMM): Convert DC bus power to variable-frequency AC output per axis command
- 4. Encoder Feedback: Incremental/absolute encoders connected via SMC (Sensor Module Cabinet) report position/speed back to CU320-2 DP via Drive-CLiQ
- 5. Active Line Module (ALM): Provides regulated DC bus voltage; communicates status to CU320-2 DP via Drive-CLiQ
Sourcing & Quality Verification
- Origin: Genuine Siemens OEM hardware, sourced from authorized distribution channels and verified industrial surplus
- Inspection Protocol: Each unit undergoes visual inspection, firmware version verification, and functional power-on test prior to shipment
- Traceability: Serial number and date code recorded; full documentation available on request
- Packaging: Anti-static ESD bag + foam-lined export carton; compliant with ISTA 2A transit testing standards
- Warranty: 12-month replacement warranty against manufacturing defects
Procurement Process
- Step 1 – Inquiry: Submit your part number, required quantity, and delivery timeline via email or the contact form
- Step 2 – Quotation: Receive a formal quotation with unit price, lead time, and shipping options within 24 business hours
- Step 3 – Order Confirmation: Confirm PO; payment accepted via T/T bank transfer, PayPal, or trade assurance
- Step 4 – Shipment: Units dispatched via DHL / FedEx / UPS Express with full tracking; export documentation (commercial invoice, packing list, COO) included
- Step 5 – After-Sales: Technical support available via email within 1 business day; RMA process initiated within 48 hours if required
Technical FAQ
Q: Is the 6SL3351-6GE33-8AB3 compatible with SINAMICS S120 firmware V4.x?
A: This variant is optimized for firmware V5.x and above. Downgrade to V4.x is not supported due to hardware memory architecture differences.
Q: Can this CU320-2 DP control both servo and vector axes simultaneously?
A: Yes. The CU320-2 DP supports mixed topologies — servo axes (with encoder) and sensorless vector axes can coexist within the same Drive-CLiQ network, up to the 6-axis limit.
Q: What is the difference between 6SL3351-6GE33-8AB3 and the standard 6SL3040-1MA01-0AA0 CU320-2 DP?
A: The 6SL3351-6GE33-8AB3 is a factory-configured variant with pre-installed option boards and specific firmware licensing. Always verify the exact order number against your system’s Bill of Materials.
Q: Do you provide STEP 7 / TIA Portal project files?
A: We can provide GSD files for PROFIBUS DP integration. Full TIA Portal project templates are available upon request for qualified system integrators.
Q: What is the lead time for in-stock units?
A: In-stock units ship within 1–3 business days. For bulk orders (>5 units), please contact us for availability and volume pricing.
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