Siemens 6SL3244-0BB12-1FA0 CU240E-2 PN – SINAMICS G120 Control Unit
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Product Information
The Siemens 6SL3244-0BB12-1FA0 is a SINAMICS G120 CU240E-2 PN drive control unit designed for intelligent motor regulation in modular frequency inverter configurations. Functioning as the central control module for SINAMICS G120 drive systems, this unit mounts directly onto compatible power modules, including the PM240, PM240-2, and PM250 series. Operating on a nominal supply voltage of 24 V DC within a 20 to 29 V DC range, the compact unit features dimensions of 73 x 199 x 46 mm, an IP20 protection rating, and an operating temperature range of 0 to +50 °C, making it suitable for cabinet installation in industrial environments.
For field communication and controller integration, the unit features a native PROFINET interface with dual RJ45 ports running at 100 Mbit/s, alongside integrated Safe Torque Off (STO) functional safety capabilities. Physical connections include 6 digital inputs (including 1 fail-safe input), 3 digital outputs, 2 analog inputs, 2 analog outputs, and a motor temperature sensor interface supporting PTC, KTY, and PT1000 sensors. Commissioning a replacement unit requires restoring drive parameters via an SD/MMC card or uploading configuration data using TIA Portal or STARTER engineering software. When backing up parameters or retrieving drive settings from operational hardware, ABC Industrial Parts can assist in preparing replacement hardware for immediate deployment.
System status and operating conditions are displayed directly on the front panel via the RDY, BF, and SAFE status LEDs. Additional diagnostic feedback can be accessed through drive fault and alarm buffers, local operator panels such as the BOP-2 and IOP, or over the PROFINET network via engineering software. Initial maintenance checks should verify the 24 V DC supply power, RJ45 fieldbus cables, fail-safe input connections, and sensor wiring. If internal hardware issues occur, board-level repairs or a pre-tested exchange unit from ABC Industrial Parts offer a reliable path to restoring production uptime.
Technical Specifications
| Manufacturer | Siemens |
| Part Number | 6SL3244-0BB12-1FA0 |
| Model / Type | CU240E-2 PN |
| Product Family | SINAMICS G120 |
| Supply Voltage | 24 V DC |
| Supply Voltage Range | 20 - 29 V DC |
| Rated Current Consumption | 0.5 A |
| Digital Inputs | 6 (including 1F-DI) |
| Digital Outputs | 3 |
| Analog Inputs | 2 |
| Analog Outputs | 2 |
| Fieldbus Protocol | PROFINET |
| Ethernet Interface | 2x RJ45 (100 Mbit/s) |
| IP Rating | IP20 |
| Operating Temperature | 0 to +50 °C |
| Dimensions (W x H x D) | 73 x 199 x 46 mm |
Programming and Configuration
Configuration and commissioning of the Siemens 6SL3244-0BB12-1FA0 CU240E-2 PN control unit are performed using Siemens engineering software, including TIA Portal and STARTER. These platforms allow technicians to set motor parameters, configure control loops, assign I/O functions, and establish fieldbus communication structures across the drive network.
Parameter backup and cloning are simplified by an onboard SD/MMC card slot and a front Mini-USB interface. Drive settings can be stored on removable memory media or transferred directly from a PC, enabling rapid cloning across multiple drives without requiring software tools on the factory floor.
For local monitoring and parameter adjustment without a PC connection, the control unit supports snap-on operator panels such as the Basic Operator Panel (BOP-2) and Intelligent Operator Panel (IOP). These keypads provide direct access to parameter lists, setup wizards, and operating status readouts.
Communication and System Integration
The CU240E-2 PN control unit features native PROFINET fieldbus connectivity delivered through two integrated RJ45 ports operating at 100 Mbit/s. This dual-port Ethernet interface allows direct integration into line and ring network topologies, enabling real-time communication with SIMATIC S7 PLCs and industrial control systems.
Comprehensive physical I/O options allow versatile interfacing with external devices and sensors. The unit includes 6 digital inputs—with support for 1 fail-safe input for functional safety integration—alongside 3 digital outputs, 2 analog inputs, and 2 analog outputs for flexible control and feedback handling.
In addition to standard control signals, the module features a dedicated motor temperature sensor interface compatible with PTC, KTY, and PT1000 sensors. This input continuously monitors thermal conditions inside the connected motor to protect windings against overload conditions.
Diagnostics and Status Indication
Diagnostics for the 6SL3244-0BB12-1FA0 control unit are provided through multiple visual and software-based channels. Front-panel status LEDs give immediate visual feedback on unit operation, fieldbus state, and functional safety status.
Detailed diagnostic information can be evaluated through drive fault and alarm buffers, accessible locally via BOP-2 and IOP operator panels or remotely over PROFINET using TIA Portal and STARTER diagnostic tools.
Status LED Indicators
| LED | Color/Status | Meaning |
|---|---|---|
| RDY | Green - Solid / Flashing | Ready / Operating status indicator |
| BF | Red - Flashing / Solid | Bus Fault indicator for PROFINET communication error |
| SAFE | Yellow - Solid / Off | Status of Safety Integrated functions (Safe Torque Off - STO) |
Replacement and Spare Part Considerations
When replacing a 6SL3244-0BB12-1FA0 control unit, verify that the replacement device matches the exact part number and variant, particularly regarding the PROFINET communication interface and functional safety requirements. The unit snaps directly onto existing SINAMICS G120 power modules, including the PM240, PM240-2, and PM250 series.
A replacement control unit must be configured with the application parameter set before operation. If a parameter backup exists on an SD/MMC card, inserting the memory card into the replacement unit allows automated parameter restoration. Alternatively, parameters can be downloaded via TIA Portal or STARTER using a Mini-USB connection or network connection.
Ensure that safety-related digital input wiring (1F-DI) and fieldbus IP address configurations are verified after mounting the replacement unit. Proper alignment of parameter sets and firmware ensures seamless operation with connected SIMATIC controllers.
Frequently Asked Questions
How is parameter data transferred to a replacement Siemens 6SL3244-0BB12-1FA0 control unit?
Parameter data can be restored using an SD/MMC card containing the drive backup, or uploaded via TIA Portal or STARTER software using the front Mini-USB connection or PROFINET network.
Which power modules are compatible with the CU240E-2 PN control unit?
The CU240E-2 PN mounts directly onto SINAMICS G120 power modules, including the PM240, PM240-2, and PM250 series.
What safety features are integrated into the 6SL3244-0BB12-1FA0?
The unit features built-in Safety Integrated functions supporting Safe Torque Off (STO), utilizing fail-safe digital inputs to implement safety circuits without external safety contactors.
What do the front status LEDs on the CU240E-2 PN indicate?
The RDY (green) LED indicates ready and operating status, the BF (red) LED signals PROFINET bus faults, and the SAFE (yellow) LED indicates the active state of Safe Torque Off (STO) functions.
What motor temperature sensors can be connected to the 6SL3244-0BB12-1FA0?
The dedicated temperature sensor interface supports PTC, KTY, and PT1000 sensors for thermal motor protection.
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Disclaimer:
We are not an authorised distributor of Siemens.
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