Understanding the Control Unit CU310-2 DP (PROFIBUS) in a Sinamics S120 Drive
In high-performance motion control systems, the Sinamics S120 Drive stands out for its modularity, flexibility, and precision. At the heart of its single axis control capability is the Control Unit CU310-2 DP, designed specifically for PROFIBUS communication. Whether you’re integrating, commissioning, or maintaining a Sinamics S120 system, understanding the role of the CU310-2 DP is key to unlocking the full potential of your drive system.
What Is the CU310-2 DP Control Unit?
The CU310-2 DP is a dedicated control module used in single-motor Sinamics S120 drive setups. It performs both open-loop and closed-loop control functions and acts as the brain of the system, interfacing with Power Modules and various feedback and communication systems.
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For blocksize Power Modules, the CU310-2 DP communicates via the PM-IF interface.
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For chassis Power Modules, it connects using DRIVE-CLiQ, Siemens’ high-speed digital communication protocol.
Key Features of the CU310-2 DP (PROFIBUS)
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PROFIBUS Communication Interface: Seamlessly integrates into PROFIBUS-based networks for industrial automation.
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LAN (Ethernet) Port: For engineering access, parameterization, and diagnostics.
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Encoder Support: Compatible with TTL, HTL, and SSI encoder types for precise feedback.
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Analog Setpoint Input: For external analog control signals.
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Hot-Pluggable: Can be inserted or removed without powering down the system.
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Firmware Support: Requires firmware version 4.4 or higher.
These features make the CU310-2 DP ideal for applications that demand reliability, precision, and robust communication with higher-level controllers or PLCs.
Interface Overview
The CU310-2 DP is equipped with a wide range of interfaces for flexible I/O and communication needs:
| Interface | Function |
|---|---|
| 11x Isolated Digital Inputs | For signals like Start, Stop, Enable, etc. |
| 8x Non-Isolated DI/DO | Flexible digital I/O for general use |
| 1x Isolated Digital Output | For control feedback or interlocking |
| 1x Analog Input (non-isolated) | Accepts ±10V control signals |
| 1x PROFIBUS Interface | Main fieldbus communication (X127) |
| 1x LAN (Ethernet) Port | Engineering interface (X130) |
| 1x RS232 Serial Port | Serial communication (X101) |
| 1x Encoder Interface (TTL/HTL/SSI) | Feedback signal interface |
| 1x Temperature Sensor Input | For monitoring motor temperature (X123) |
| 1x EP Terminal | Pulse enable (X124) |
| 3x Measuring Sockets | For diagnostics and service measurements |
| 1x DRIVE-CLiQ Interface (X100) | High-speed digital bus to Power Modules |
The X100 DRIVE-CLiQ Interface
The X100 port is a critical link in the Sinamics system, enabling high-speed communication between the CU310-2 DP and peripheral components like Power Modules and Sensor Modules.
Pinout Details Include:
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TX+ / TX- (Transmit Data)
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RX+ / RX- (Receive Data)
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+24V / GND (Power Supply for connected components)
The port is protected with a blanking cover included by default, helping maintain safety and signal integrity when unused.
Technical Specifications
| Specification | Value |
|---|---|
| Operating Voltage | DC 24V (Range: 20.4 – 28.8V) |
| Operating Current | 0.8 A DC |
| Power Loss | < 20W |
| Max DRIVE-CLiQ Cable | 100 meters |
| Weight | Approx. 0.95 kg |
| Mounting Orientation | Vertical on DIN rail |
Real-World Applications
The CU310-2 DP is commonly used in:
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Single-axis machine tools
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Packaging machinery
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Material handling systems
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Robotics
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Textile machinery
Its modular structure and robust fieldbus integration make it ideal for applications where high precision and decentralized control are required.
Conclusion
The CU310-2 DP Control Unit is a cornerstone component of the Sinamics S120 drive system, designed to provide precise control and seamless integration into PROFIBUS-based networks. With a full suite of I/O interfaces, encoder support, and compact design, it brings flexibility and scalability to demanding industrial environments.
Understanding the CU310-2 DP’s functionality and proper configuration ensures optimal drive performance, reduced downtime, and reliable control in your automation projects.
For more information, contact PLG Automation:
Email: sales@plgautomation.com
Phone: 800-906-9271