6SL3244-0BB00-1PA1 | PROFIBUS DP Drive Controller Siemens

SINAMICS G120 CU240B-2 DP Control Unit – Product Introduction

The SINAMICS G120 CU240B-2 DP (Article No. 6SL3244-0BB00-1PA1) is a compact control unit designed for the SINAMICS G120 modular drive system. This unit communicates via PROFIBUS DP, enabling seamless integration into industrial automation networks. Its comprehensive I/O and sensor interfaces allow flexible motor control for various applications like conveyors, pumps, and fans.

Important Product Lifecycle Note

Siemens has discontinued this model for new projects. It reached its product discontinuation milestone and is now available primarily for maintenance or replacement purposes. Therefore, we strongly recommend this unit solely for supporting existing equipment rather than for new machine designs.

Key Electrical Specifications

You can power this control unit from two sources. First, it draws power directly from the connected Power Module. Alternatively, you can supply it externally via terminals 31 and 32 with DC 20.4 V to 28.8 V. The maximum current consumption is 1.5 A, and the typical power loss is 5.0 W. Additionally, the unit provides a 24 V output (terminal 9) up to 100 mA and a 10 V output (terminals 1 and 35) up to 10 mA for powering external sensors. The operating temperature range is 0 °C to +50 °C.

Communication and Connectivity

Communication relies on the PROFIBUS DP interface, which allows connection to higher-level PLC control systems. Moreover, the unit includes a USB Mini-B port and an SD/MMC card slot for easy parameter backup, transfer, and firmware updates. Furthermore, you get one analog input (AI 0) as a differential input. You can configure it for 0–10 V, -10–+10 V, or 0–20 mA signals with 12-bit resolution. One analog output (AO 0) supports 0–10 V or 0–20 mA signals with 16-bit resolution for process feedback.

Inputs, Outputs, and Motor Protection

The CU240B-2 DP provides four digital inputs (DI 0–3). These are electrically isolated and accept 30 V maximum input voltage. They switch low below 5 V and high above 11 V, making them compatible with standard PLC outputs. For digital output, the unit features one relay output (DO 0), rated for resistive loads up to 30 V DC at 0.5 A.

For motor thermal protection, the unit includes a dedicated sensor interface supporting PTC thermistors, KTY84 sensors, Pt1000 sensors, and Thermoclick (normally-closed temperature switches). This flexibility lets you monitor motor temperature and prevent overheating in most common motor types. Meanwhile, the unit does not include any fail-safe digital inputs, so standard safety applications only.

Mechanical and Environmental Data

The control unit has a compact footprint, measuring 73 mm wide, 199 mm high, and 39 mm deep when mounted on the Power Module. Its lightweight design (0.49 kg net) simplifies installation inside control cabinets. Furthermore, the unit carries an IP20 degree of protection, so you must install it inside a clean, dry enclosure. For storage, the unit withstands temperatures from -40 °C to +70 °C.

Installation Guidelines

Mount the CU240B-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. 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 (20.4–28.8 V).

Packaging List

• SINAMICS G120 CU240B-2 DP control unit (6SL3244-0BB00-1PA1) × 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. 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.

2. Is this unit still available for new machine designs?
No, Siemens has discontinued this model. It is now available primarily as a spare part for existing equipment. For new projects, consider the CU240E-2 PN or CU250S-2 as modern alternatives.

3. What is the purpose of the SD/MMC card slot?
The SD/MMC card slot lets you save and transfer drive parameters, firmware, and cloning files. This feature speeds up commissioning when you need to duplicate settings across multiple drives.

4. How does the temperature sensor interface work?
The unit supports PTC, KTY84, Pt1000, and Thermoclick sensors. It monitors motor winding temperature and triggers a fault if the temperature exceeds safe limits, protecting the motor from damage.

5. What happens if the external 24 V supply fails?
The unit may enter a fault state, causing the motor to coast to a stop. For reliable operation, we recommend using a stabilized power supply with sufficient capacity and voltage monitoring.