SIEMENS 6SL3244-0BB12-1BA1 CU240E-2 Control Unit – SINAMICS G120 Series
When a SINAMICS G120 drive loses its Control Unit, the entire production line stops. Motors cannot be started, speed references are lost, and safety functions go offline — costing manufacturers thousands of dollars per hour in unplanned downtime. The CU240E-2 Control Unit is the intelligence core of the G120 drive system: without it, even a perfectly functional Power Module is nothing more than inert hardware.
The SIEMENS 6SL3244-0BB12-1BA1 is the CU240E-2 variant within the SINAMICS G120 Control Unit family — a mid-range, feature-rich unit designed for applications requiring USS and MODBUS RTU fieldbus communication alongside standard I/O. Positioned between the basic CU240B-2 and the advanced CU240E-2 DP (PROFIBUS), the 6SL3244-0BB12-1BA1 is the preferred choice for OEMs and system integrators who need reliable serial communication without the cost overhead of PROFIBUS infrastructure. It is one of the most widely deployed G120 control units in global industrial automation, trusted in sectors from water treatment to material handling.
Technical Specifications
- Part Number: 6SL3244-0BB12-1BA1
- Model: CU240E-2
- Series: SINAMICS G120
- Manufacturer: Siemens AG
- Fieldbus Interface: USS protocol, MODBUS RTU (RS-485)
- Digital Inputs: 6 × DI (configurable)
- Digital Outputs: 3 × DO (relay)
- Analog Inputs: 2 × AI (0–10 V / 0–20 mA)
- Analog Outputs: 1 × AO (0–20 mA)
- Safety Function: STO (Safe Torque Off) via terminals — SIL 2 / PLd
- Operator Panel Interface: BOP-2 / IOP compatible
- Memory Card Slot: Yes (SD card for parameter backup/clone)
- Supply Voltage: 24 V DC (from Power Module backplane)
- Ambient Temperature: 0 °C to +55 °C (operating)
- Protection Class: IP20
- Weight: Approx. 1,300 g
- Compatible Power Modules: PM240-2, PM250, PM260 (frame sizes FSA–FSF)
Key Features & Benefits
- Integrated STO Safety: Achieves SIL 2 / Category 3 / PLd safe torque-off without external safety relays, reducing panel wiring complexity and cost.
- Dual Serial Fieldbus: Native USS and MODBUS RTU support enables seamless integration with SCADA systems, PLCs, and HMIs from multiple vendors.
- Plug-and-Play Parameter Cloning: SD memory card slot allows rapid parameter transfer across multiple drives — critical for large-scale commissioning and fast replacement.
- Flexible I/O Configuration: Six digital inputs and multiple analog channels support complex control schemes including PID feedback loops and multi-setpoint operation.
- BOP-2 / IOP Compatibility: Supports both basic and intelligent operator panels for local commissioning, diagnostics, and parameter adjustment without a laptop.
- Compact Snap-On Design: Mounts directly onto any compatible G120 Power Module without tools — minimizing replacement time during maintenance windows.
- Wide Ambient Range: Rated to +55 °C continuous operation, suitable for demanding industrial enclosures without forced cooling.
Industry & Equipment Applications
- Water & Wastewater: Pump speed control with MODBUS integration to SCADA systems; STO for safe maintenance isolation.
- Material Handling: Conveyor belt drives, palletizers, and sortation systems requiring precise speed regulation.
- HVAC & Building Automation: Fan and air handling unit (AHU) control with analog setpoint from BMS via 0–10 V input.
- Food & Beverage: Mixer, extruder, and bottling line drives where hygienic operation and reliable fieldbus communication are essential.
- Textile & Printing: Tension-controlled winding/unwinding applications using analog feedback.
- OEM Machine Builders: Standard platform for multi-axis machines requiring a cost-effective, scalable drive solution with serial communication.
System Integration & Compatible Parts
- Compatible Power Modules: 6SL3210-1PB13-8AL0, 6SL3210-1PB15-5AL0, 6SL3210-1PB17-4AL0, 6SL3210-1PB21-1AL0 (PM240-2 series)
- Operator Panels: 6SL3255-0AA00-4CA1 (BOP-2), 6SL3255-0AA00-4JA0 (IOP)
- Brake Relay: 6SL3252-0BB00-0AA0
- Shield Connection Kit: 6SL3262-1AA00-0DA0
- Memory Card: 6SL3054-4AG00-2AA0 (SD card, 512 MB)
- STARTER / SINAMICS Startdrive: Required for advanced parameterization via PC (TIA Portal V14+)
- Replacement for: 6SL3244-0BB12-1BA0 (previous hardware revision)
Our Quality Assurance Process
At Konmask.com, every SIEMENS 6SL3244-0BB12-1BA1 unit is processed through a rigorous multi-stage verification protocol before dispatch:
- Authenticity Verification: Cross-referenced against Siemens product databases; holographic labels and serial number traceability checked.
- Visual & Physical Inspection: Connector pins, housing integrity, and firmware label examined for signs of counterfeit or refurbishment.
- Functional Pre-Test: Where applicable, units are bench-tested for power-up response and communication port activity.
- Secure Packaging: Anti-static ESD bags, foam-lined boxes, and moisture-barrier packaging for international freight.
- Documentation: Certificate of conformity and packing list included with every shipment.
How to Order
- Submit your inquiry via the Contact / RFQ form on this page with your required quantity and delivery timeline.
- Our technical sales team will respond within 24 business hours with availability, lead time, and a formal quotation.
- Upon PO confirmation, we arrange export documentation, freight booking, and tracking notification.
- Typical lead time: 3–7 business days for in-stock units; 2–4 weeks for factory-order items.
For urgent requirements, please indicate “URGENT” in your inquiry subject line for priority handling.
Why Choose Konmask.com?
- ✅ Specialized in Industrial Automation: 100% focus on PLC, DCS, drives, and automation components — not a generalist marketplace.
- ✅ Verified Supply Chain: Direct relationships with authorized distributors and factory channels for genuine Siemens parts.
- ✅ Global Export Experience: Serving clients in 40+ countries with compliant export documentation and reliable logistics partners.
- ✅ Technical Pre-Sales Support: Our engineers can advise on compatibility, firmware versions, and system integration before you commit to a purchase.
- ✅ Competitive Lead Times: Strategic stock positioning ensures faster delivery than many regional distributors.
Frequently Asked Questions
- Q: Is the 6SL3244-0BB12-1BA1 compatible with all SINAMICS G120 Power Modules?
- A: It is compatible with PM240-2, PM250, and PM260 Power Modules in frame sizes FSA through FSF. It is not compatible with the G120C (compact drive) or G120P (pump/fan) integrated units, which have built-in control units.
- Q: What is the difference between CU240E-2 and CU240E-2 DP?
- A: The CU240E-2 (6SL3244-0BB12-1BA1) uses USS/MODBUS RTU serial communication. The CU240E-2 DP adds PROFIBUS DP fieldbus capability. Choose CU240E-2 for serial-based systems; choose CU240E-2 DP for PROFIBUS networks.
- Q: Can I transfer parameters from an old CU240E-2 to this unit?
- A: Yes. Using the SD memory card slot, you can clone parameters from an existing unit in minutes. Alternatively, parameters can be uploaded/downloaded via STARTER software or TIA Portal with SINAMICS Startdrive.
- Q: Does this unit support Safe Torque Off (STO) without an external safety relay?
- A: Yes. The CU240E-2 has integrated STO via terminals, certified to SIL 2 / Category 3 / PLd. No external safety relay is required for basic STO functionality.
- Q: What is the minimum order quantity (MOQ)?
- A: We supply from single units upward. There is no minimum order quantity for standard inquiries. Volume pricing is available for orders of 5 units or more.
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