Siemens 6SL3120-1TE Replacement for SINAMICS S120

Product Overview

Siemens 6SL3120-1TE Replacement for SINAMICS S120: Smooth Transition & Legacy System Compatibility

Upgrading or replacing a Siemens 6SL3120-1TE Single-Axis Motor Module within a SINAMICS S120 Booksize drive system demands precision — not just in hardware selection, but in wiring compatibility, communication protocol continuity, control cabinet space planning, and firmware alignment. Whether your existing system is approaching end-of-life, has suffered a fault, or is being modernized as part of a broader plant upgrade, this module is engineered to deliver a seamless, low-downtime transition from legacy configurations to current-generation SINAMICS S120 architecture.

The 6SL3120-1TE is a booksize-format single-axis motor module designed for integration into the SINAMICS S120 drive system. It operates in conjunction with a Control Unit — typically a CU320-2 DP or CU320-2 PN — and communicates via the internal DRIVE-CLiQ interface, which carries both power feedback and encoder data over a single cable, dramatically simplifying wiring during retrofit. When migrating from an older SINAMICS S120 configuration or from a legacy MASTERDRIVES MC or SIMODRIVE 611 system, the DRIVE-CLiQ topology eliminates the need for separate encoder evaluation boards, reducing panel wiring complexity and commissioning time.

In terms of physical installation, the booksize form factor of the 6SL3120-1TE is designed to mount directly onto a standard SINAMICS S120 Booksize Power Module rail — such as the 6SL3130-series Line Module or 6SL3100-series Smart Line Module — using the DC bus connector and signal bus adapter. This means that in most retrofit scenarios, the existing cabinet rail, DC bus bar, and 24 V DC auxiliary power supply from a 6EP1333-series SITOP power supply can be retained without modification, preserving cabinet space and reducing hardware procurement scope.

For sites migrating from a SINAMICS S120 Chassis or Cabinet Module format to Booksize, or consolidating multiple single-axis drives into a shared DC bus architecture, the 6SL3120-1TE supports regenerative energy sharing across axes via the common DC link — a key advantage when replacing standalone AC drives or older vector inverters. This is particularly relevant in multi-axis machine tool, packaging line, or printing press applications where coordinated motion control is required.

Communication compatibility is a critical factor in any migration. The 6SL3120-1TE integrates natively with SIMATIC S7-300, S7-400, and S7-1500 PLCs via PROFIBUS DP or PROFINET IO, depending on the Control Unit variant selected. Existing drive parameter sets created in STARTER or SINAMICS Startdrive (TIA Portal) can be exported, adapted, and re-downloaded to the replacement module, preserving motor data, speed ramps, torque limits, and safety function configurations. This significantly reduces re-commissioning time compared to a full drive replacement with a different platform.

Encoder interface compatibility should be verified during pre-migration planning. The 6SL3120-1TE supports SMC (Sensor Module Cabinet-Mounted) adapters — such as the 6SL3055-0AA00-5BA3 SMC20 — for incremental encoders, resolvers, and absolute encoders not equipped with DRIVE-CLiQ. If the existing motor uses a legacy HTL or TTL encoder, an SMC module can be added to the booksize rail without requiring motor replacement, preserving the existing mechanical installation.

Safety function continuity is another migration consideration. The 6SL3120-1TE supports integrated Safety Integrated functions including STO (Safe Torque Off), SS1 (Safe Stop 1), and SLS (Safely Limited Speed) — functions that may have previously been implemented via external safety relays or a 3SK1-series safety relay module in older installations. Migrating these functions to the drive’s integrated safety layer reduces external wiring, simplifies the safety circuit, and supports IEC 62061 / ISO 13849 compliance documentation.

From a procurement and supply chain perspective, the 6SL3120-1TE is stocked and available for immediate dispatch. Each unit undergoes pre-shipment functional testing, is supplied with original Siemens packaging and documentation references, and is covered by a 12-month replacement warranty. Lead times for standard configurations are typically 3–7 business days for international air freight, with expedited options available for urgent plant-down situations. Our team can also assist with cross-referencing the exact output current rating suffix (e.g., 6SL3120-1TE21-8AA3, 6SL3120-1TE23-0AA3, or 6SL3120-1TE28-5AA3) to ensure the correct amperage variant is supplied for your motor nameplate data.

Compatibility Comparison Table

Seamless Upgrade Solutions

A complete migration to the 6SL3120-1TE typically involves coordinating several complementary components within the SINAMICS S120 ecosystem. The 6SL3130-7TE21-6AA3 Active Line Module or a 6SL3130-6AE21-0AB0 Smart Line Module provides the regulated DC bus voltage that feeds the motor module — these Line Modules must be sized to match the aggregate output power of all connected axis modules. A 6SL3040-1MA00-0AA0 CU320-2 PN Control Unit manages drive coordination, safety, and PROFINET communication to the host PLC, replacing older CU320 or CU310 units that may lack PROFINET capability.

For encoder signal adaptation, a 6SL3055-0AA00-5BA3 SMC20 Sensor Module handles incremental encoders (HTL/TTL) while the 6SL3055-0AA00-5CA2 SMC30 supports TTL encoders with additional diagnostic capability — both mount directly on the booksize rail. Terminal module adapters such as the 6SL3162-2AA00-0AA0 Terminal Module TM31 provide additional analog I/O and digital I/O expansion for process signals that were previously wired to standalone I/O cards or a SIMATIC ET 200SP distributed I/O station. The 6SL3060-4AX00-0AA0 DRIVE-CLiQ cable set simplifies internal wiring between the Control Unit, Line Module, and Motor Modules, replacing the multi-conductor signal harnesses used in older installations.

For sites where the existing control cabinet includes a SIMATIC S7-300 CPU315-2 DP or CPU317-2 PN/DP, the migration to PROFINET-based drive communication may also prompt an upgrade of the PLC communication module — a 6GK7343-1EX30-0XE0 CP 343-1 Ethernet module can bridge legacy PROFIBUS segments to the new PROFINET topology without requiring a full PLC replacement. Power distribution within the cabinet is typically handled by a 6EP1336-3BA00 SITOP PSU300S 24V/20A power supply, which provides the 24 V DC auxiliary rail for the Control Unit, SMC modules, and safety circuits.

Retrofit Guidance FAQ

Q: Can I reuse my existing motor wiring when replacing with the 6SL3120-1TE?
A: In most cases, yes. The motor power output terminals (U2, V2, W2) follow standard IEC wiring conventions. If the motor cable is rated for the output current of the new module and the cable length is within SINAMICS S120 specifications (typically ≤100 m unshielded, ≤50 m shielded for EMC compliance), existing motor cables can be retained. Verify PE bonding and shield termination at both ends.

Q: Will my existing STARTER project work with the replacement module?
A: Existing STARTER or Startdrive projects can be adapted. After hardware replacement, perform an automatic drive configuration upload (“Load from target device”) to read the new module’s firmware version and hardware revision, then compare against your saved parameter set. Motor data, speed controller gains, and safety parameters are typically preserved; firmware-version-specific parameters may require re-validation.

Q: How do I handle the DRIVE-CLiQ topology after replacing one axis module?
A: DRIVE-CLiQ is a daisy-chain or star topology. When replacing a single motor module, disconnect the DRIVE-CLiQ cables, install the new module, reconnect in the same topology order, and perform a “Topology Comparison” in STARTER/Startdrive. The Control Unit will detect the new module’s electronic nameplate and update the topology automatically.

Q: What if my legacy system used PROFIBUS and the new CU supports PROFINET?
A: The CU320-2 DP variant retains PROFIBUS DP compatibility for sites not yet migrating to PROFINET. If PROFINET is required, the existing PLC program’s drive telegram (e.g., PROFIdrive Telegram 1, 5, or 111) can be mapped to the PROFINET interface with minimal GSD/GSDML file updates — no changes to the drive parameter set are required for standard speed/torque control telegrams.

Q: Is physical cabinet space a concern when switching from a chassis drive to booksize?
A: Booksize modules are significantly more compact than chassis-format drives. A single 6SL3120-1TE booksize module typically occupies 45–75 mm of rail width depending on the current rating, compared to 200–400 mm for an equivalent chassis unit. This often allows consolidation of multi-axis systems into a smaller cabinet footprint, or frees space for additional I/O, safety, or communication hardware.

Warranty Assurance

Every 6SL3120-1TE unit supplied by TOPNLMS is backed by a 12-month replacement warranty from the date of shipment. Prior to dispatch, each module undergoes a pre-shipment functional inspection covering visual integrity, connector condition, firmware version verification, and packaging integrity check. Units are shipped in original or equivalent anti-static protective packaging with desiccant to prevent moisture ingress during transit.

In the event of a warranty claim, TOPNLMS provides a direct replacement unit — no repair loop, no extended RMA delay. Our standard warranty response time is within 2 business days of claim submission, with expedited replacement available for plant-critical situations. Warranty coverage applies to manufacturing defects and functional failures under normal operating conditions; it does not cover damage resulting from incorrect installation, overvoltage events, or environmental conditions outside the module’s rated specifications.

For procurement teams requiring documentation, we can provide a test report, packing list, and commercial invoice with HS code declaration for customs clearance. Volume orders and blanket purchase agreements are supported with scheduled delivery and consignment stock options. Contact our technical sales team to discuss your project requirements, cross-reference your exact current-rating variant, or request a formal quotation.