Siemens SINAMICS S120 – The Complete Guide to Siemens’ Modular Drive System

The Siemens SINAMICS S120 is a modular, high-performance drive system designed for applications requiring precision, scalability, and multi-axis control. Unlike fixed, single-drive solutions, the S120 uses a building-block architecture that lets engineers configure exactly the components they need—no more, no less.

• Modularity – Build single-axis or complex multi-axis systems with shared DC bus architecture.
• Performance – High dynamic response and precise motion control.
• Integration – Seamless with Siemens’ TIA ecosystem (SIMATIC, SIMOTION, STARTER).

Modular Architecture Explained

The Siemens SINAMICS S120 Drive System is made up of specialized modules that connect through DRIVE-CLiQ, a standardized digital interface that simplifies integration, reduces spare-part variety, lowers inventory costs, and enables real-time inter-module communication. Each module includes an electronic type plate for automatic identification via DRIVE-CLiQ—speeding commissioning and eliminating manual setup errors.

Core Modules

• Control Units (CU) – The brains of the system for motion control, safety, and communication. Models include CU320, CU310, and CU305 supporting Vector, Servo, and V/f modes.
• Line Modules (LM) – Convert incoming AC to DC link voltage; available in non-regenerative and regenerative versions for energy recovery.
• Motor Modules (MM) – Inverters that supply motors; available in single-axis and double-axis configurations.
• Auxiliary Modules – Brake resistors, filter modules, fan units, and other add-ons for EMI control and cooling.

Flexible Formats: Modules are offered in booksize, blocksize, and chassis formats. Thanks to DRIVE-CLiQ, they can be mixed and matched to fit space and design needs.

Key Features & Benefits

• Scalability – Start small and expand without redesigning the entire system.
• Multi-Mode Operation – Vector, Servo, and V/f modes cover high-precision cyclic motion and continuous processes.
• Regenerative Capability – Feed braking energy back to the supply to reduce operating costs.
• Central DC Bus Sharing – Multiple Motor Modules share one power source for efficiency.
• Flexible Layout – Booksize, blocksize, and chassis formats fit a wide range of machine footprints.
• Integrated Intelligence – Electronic type plates and automatic DRIVE-CLiQ detection minimize commissioning errors.

Industries & Applications

The S120’s versatility makes it ideal across sectors:

• Automotive – Robotic assembly, conveyors, automated inspection
• Packaging – High-speed filling, labeling, cutting with tight synchronization
• Robotics – Multi-axis control for articulated and gantry systems
• Printing – Precision roll handling for consistent print quality
• Metals – Rolling mills, presses, high-load applications

Additional applications: renewable energy systems, plastic manufacturing machinery, woodworking tools, and test benches.

Lifecycle & Support

• TIA Portal & STARTER integration – Streamlined parameterization, data management, and project archiving
• Firmware updates – Keep modules current for performance and security
• Spare parts availability – Strong long-term Siemens support
• Ease of replacement – DRIVE-CLiQ auto-detection reduces downtime during module swaps

Closing – Why the S120 Is a Go-To Modular Drive

The Siemens SINAMICS S120 Series offers flexibility, intelligence, and high performance in a modular format. From small retrofits to large-scale automation, it adapts to your needs today and tomorrow.