Siemens SINAMICS S120 Modules

Technical Dossier

Product Details And Specifications

Siemens SINAMICS S120 Series: Comprehensive Module Range and Technical Overview

The Siemens SINAMICS S120 is a modular, multi-axis drive system engineered for high-performance motion control applications across global heavy industry. Deployed extensively in chemical processing plants, nuclear power facilities, oil refineries, steel mills, and paper manufacturing lines, the S120 platform holds a dominant installed base in process-critical environments where drive reliability directly impacts plant uptime and safety margins. Its vector control architecture supports both induction and synchronous motors, making it the reference standard for coordinated multi-axis applications requiring precise torque and speed regulation. The S120 system operates across a voltage range of 380–480 V AC (booksize) and up to 690 V AC (chassis format), with power ratings spanning from 0.12 kW to several megawatts in modular configurations.

The Evolution of SINAMICS S120 Architecture

The SINAMICS S120 was introduced in the early 2000s as the successor to the SIMODRIVE 611 platform, consolidating multi-axis drive functionality into a unified DC bus architecture. The first-generation S120 booksize units introduced the DRIVE-CLiQ communication interface, a proprietary serial protocol enabling automatic component identification and real-time diagnostics between the Control Unit (CU320, CU320-2) and Motor Modules. This eliminated manual parameter assignment for encoder and motor data, a significant operational improvement over the 611 series.

The second architectural generation introduced the CU320-2 DP and CU320-2 PN variants, adding native PROFIBUS DP and PROFINET IO fieldbus integration respectively, aligning the S120 with IEC 61158 industrial network standards. Firmware evolution through SINAMICS Startdrive (TIA Portal integration) replaced the legacy STARTER commissioning tool for new installations, though STARTER remains the required tool for legacy CU320 (non-2) units. The S120 Combi variant was introduced for single-axis applications requiring a compact booksize form factor without a separate Line Module. Chassis-format units (6SL3310, 6SL3315 series) extended the platform to high-power applications above 250 kW. The platform is currently in its mature phase; Siemens continues to supply active components while providing long-term spare parts commitments for discontinued variants under its Industry Mall obsolescence management program.

SINAMICS S120 Full Catalog & Functionalities (SKU List)

The following SKUs represent the core module range of the SINAMICS S120 platform, classified by functional category. All part numbers conform to Siemens MLFB (Maschinenlesbare Fabrikatnummer) ordering conventions.

Control Units

• 6SL3040-1MA00-0AA0: CU320 Control Unit, PROFIBUS DP, for booksize Motor Modules
• 6SL3040-1MA01-0AA0: CU320-2 DP Control Unit, PROFIBUS DP, TIA Portal compatible
• 6SL3040-1MA01-0AB0: CU320-2 PN Control Unit, PROFINET IO, TIA Portal compatible

Line Modules (Active / Smart / Basic)

• 6SL3130-6AE21-0AB1: Active Line Module, 16 kW, booksize, 380–480 V
• 6SL3130-6AE23-0AB1: Active Line Module, 36 kW, booksize, 380–480 V
• 6SL3130-7TE21-6AA3: Smart Line Module, 16 kW, booksize, regenerative capable
• 6SL3130-1TE23-0AA3: Basic Line Module, 36 kW, booksize, non-regenerative

Single Motor Modules (Booksize)

• 6SL3120-1TE21-0AA3: Single Motor Module, 9 A, booksize, vector control
• 6SL3120-1TE23-0AA3: Single Motor Module, 30 A, booksize, vector control
• 6SL3120-1TE26-0AA3: Single Motor Module, 60 A, booksize, vector control
• 6SL3120-1TE28-5AA3: Single Motor Module, 85 A, booksize, vector control

Double Motor Modules (Booksize)

• 6SL3120-2TE21-0AA3: Double Motor Module, 2×9 A, booksize, dual-axis output
• 6SL3120-2TE23-0AA3: Double Motor Module, 2×18 A, booksize, dual-axis output

Power Modules (S120 Combi / PM340)

• 6SL3210-1SE21-0UA0: PM340 Power Module, 4 kW, 380–480 V, IP20, single-axis
• 6SL3210-1SE22-2UA0: PM340 Power Module, 7.5 kW, 380–480 V, IP20, single-axis
• 6SL3210-5BE22-2CV1: S120 Combi Power Module, 2.2 kW, 380–480 V, booksize compact, integrated CU

Supplementary / Interface Modules

• 6SL3055-0AA00-3AA0: Terminal Module TM31, 8 DI / 4 DO / 4 AI / 2 AO, DRIVE-CLiQ
• 6SL3055-0AA00-3BA0: Terminal Module TM15, 24 bidirectional DI/DO, DRIVE-CLiQ
• 6SL3055-0AA00-2AA0: Sensor Module Cabinet SMC20, incremental encoder interface

Sourcing Hard-to-Find & Obsolete SINAMICS S120 Parts

DriveKNMS maintains a dedicated inventory program for SINAMICS S120 components across all production generations, including first-generation CU320 control units, early-revision booksize Motor Modules, and discontinued PM340 variants. For plant operators running S120 systems installed prior to 2010, sourcing replacement control units and line modules through standard distribution channels is increasingly constrained as Siemens transitions these part numbers to limited-availability status.

DriveKNMS sources S120 modules through verified industrial surplus channels, OEM decommissioning programs, and direct factory-refurbishment pipelines. Each unit is cross-referenced against the Siemens MLFB database to confirm hardware revision compatibility before dispatch. For customers requiring long-term maintenance agreements covering S120 spare parts, DriveKNMS offers reserved stock allocation on high-demand SKUs including CU320-2 variants and Active Line Modules. Inquiries for bill-of-materials (BOM) matching against existing plant documentation are handled directly by the technical sales team.

Quality Control for the SINAMICS S120 Range

The SINAMICS S120 platform presents specific quality verification requirements due to its DRIVE-CLiQ bus topology and multi-module DC bus architecture. DriveKNMS applies the following test protocol to all S120 units processed through its facility:

• DRIVE-CLiQ enumeration test: Each module is connected to a reference CU320-2 and verified to enumerate correctly on the DRIVE-CLiQ network, confirming firmware version, hardware revision, and component ID data integrity.
• DC bus capacitor ESR measurement: Electrolytic capacitors in Line Modules and Motor Modules are tested for equivalent series resistance (ESR) against manufacturer-specified limits to identify age-related degradation.
• IGBT gate drive verification: Power semiconductor switching characteristics are validated under controlled load conditions to confirm gate drive integrity and switching timing.
• Backplane connector inspection: Booksize module bus bar connectors are inspected for fretting corrosion and contact resistance, a known failure mode in S120 units subjected to vibration environments.
• Firmware version audit: Control units are verified for firmware version compatibility with the customer's existing STARTER or TIA Portal project version to prevent commissioning conflicts.
• Functional run test: Where applicable, Motor Modules are tested under resistive load to confirm rated output current delivery and thermal management performance.

© 2026 DriveKNMS. All trademarks belong to their respective owners. Specifications are for reference only and subject to change without notice. Verify all parameters against official documentation before installation.