6SL3244-0BB12-1PA1 SINAMICS Control Unit Siemens

SINAMICS G120 CU240E-2 DP Control Unit – Product Introduction

The SINAMICS G120 CU240E-2 DP (Article No. 6SL3244-0BB12-1PA1) is an advanced control unit for the SINAMICS G120 modular drive system. This unit communicates via PROFIBUS DP, enabling seamless integration into industrial automation networks. It offers a rich set of I/O and advanced control techniques, making it suitable for demanding motor control applications such as conveyors, pumps, fans, and compact material handling systems.

Safety and Fail-Safe Input Capability

This model features one fail-safe digital input, which uses two standard digital inputs to form a redundant safety channel. This design allows you to connect emergency stop buttons or safety switches without requiring an external safety relay. Therefore, the CU240E-2 DP supports basic safety functions like Safe Torque Off (STO) and Safe Stop 1 (SS1) when paired with a compatible Power Module. The standard digital inputs total six, with switching levels at 11 V for 0→1 and 5 V for 1→0.

Key Electrical Specifications

You can power this control unit from two sources. First, it draws power directly from the connected Power Module at DC 24 V. Alternatively, you can supply it via an external DC source ranging from 20 V to 29 V. The maximum current consumption is only 0.50 A, and the typical power loss is 5.50 W. Consequently, this unit runs efficiently without generating excessive heat. Additionally, the unit supports a wide operating temperature range from -10 °C to 55 °C (14 °F to 131 °F), ensuring reliable performance in most industrial environments.

Communication and Connectivity

Communication relies on the PROFIBUS DP interface, which allows seamless integration into higher-level PLC-based control networks. Moreover, the unit provides extensive I/O capabilities for flexible machine interfacing. Specifically, you get six standard digital inputs, with one pair configurable as a fail-safe digital input for safety applications. Furthermore, the CU240E-2 DP includes two relay outputs, both functioning as changeover relays.

In addition to digital I/O, this unit provides two analog/digital differential inputs and two non-isolated analog outputs. These analog channels enable you to connect external sensors or transmitters for process feedback, such as pressure, flow, or temperature signals.

Control Techniques and Performance

The CU240E-2 DP supports a broad range of closed-loop control methods, giving you the flexibility to match the drive to your specific load characteristics. For simple applications, select the V/f linear or square-law characteristic, which is common for pumps and fans. You can also enable the V/f with flux current control (FCC) for improved dynamic response. Additionally, the V/f ECO linear and square-law modes help reduce energy consumption in variable-torque loads.

For more demanding applications, the unit offers sensorless vector control and encoderless torque control. These methods provide high torque accuracy and fast speed response without requiring an encoder feedback device. However, this particular model does not support vector control with a sensor or torque control with an encoder. Therefore, if your application needs precise position or torque control at zero speed, consider other CU models with encoder interfaces.

Mechanical and Environmental Data

The control unit has a compact footprint, measuring only 73.0 mm wide, 199.0 mm high, and 46.0 mm deep. Its lightweight design (0.49 kg net) simplifies mounting inside control cabinets. Furthermore, the unit carries an IP20 degree of protection (UL open type), so you must install it in a clean, dry enclosure. The permissible relative humidity during operation is up to 95% (non-condensing). For storage, the unit withstands temperatures from -40 °C to 70 °C (-40 °F to 158 °F).

All signal cables should have a conductor cross-section between 0.05 mm² and 1.50 mm² (AWG 28 to AWG 16). Finally, this product complies with major international standards, including CE, UL, cUL, RCM, and SEMI F47. The CE marking confirms conformity with the Low-voltage Directive 2014/35/EC.

Installation Guidelines

Mount the CU240E-2 DP directly on the Power Module using the built-in snap-on mechanism. Ensure proper grounding and shielding for all signal cables to avoid electromagnetic interference. Also, leave sufficient clearance around the unit for airflow, as passive cooling relies on natural convection. For PROFIBUS DP wiring, use a certified bus cable and terminate the bus line correctly at both ends. Finally, connect the external 24 V DC supply only after verifying the voltage stability within the specified range (20–29 V).

Packaging List

• SINAMICS G120 CU240E-2 DP control unit (6SL3244-0BB12-1PA1) × 1

• Terminal block set for I/O connections × 1

• PROFIBUS DP interface connector (9-pin D-sub) × 1

• Mounting clip and grounding bracket × 1

• Multilingual quick start guide (paper) × 1

Shipping methods: FedEx, UPS, DHL

FAQ

1. How does the fail-safe digital input work?
The unit uses two standard digital inputs as a redundant pair for the fail-safe input. This redundancy ensures that a single component failure does not compromise the safety function, allowing you to connect emergency stop devices directly.

2. Can I use this control unit with any G120 Power Module?
Yes, this unit works with all SINAMICS G120 Power Modules, including PM240-2 and PM250 models. The control unit itself requires a 24 V DC supply, which the Power Module can provide.

3. Does this unit support PROFINET communication?
No, this specific model supports only PROFIBUS DP. For PROFINET connectivity, you would need a different control unit, such as the CU240E-2 PN or CU250S-2 PN.

4. What safety functions does the CU240E-2 DP support?
When paired with a compatible Power Module, this unit supports Safe Torque Off (STO) and Safe Stop 1 (SS1). These functions protect personnel and machinery during emergency situations.

5. What is the difference between CU240E-2 DP and CU240B-2 DP?
The CU240E-2 DP offers more I/O (6 DI vs. 4 DI, 2 relay outputs vs. 1, 2 AI vs. 1, 2 AO vs. 1) and includes a fail-safe digital input. The CU240B-2 DP is a more basic version with fewer features.