Siemens 6SL3420-2TE11-7AA1 Replacement for SINAMICS S120

Product Overview

Siemens 6SL3420-2TE11-7AA1 Replacement for SINAMICS S120: Seamless Transition & Smooth Upgrade

The Siemens 6SL3420-2TE11-7AA1 is a SINAMICS S120 Double Motor Module (dual-axis servo drive) designed for booksize format installation within the S120 drive line-up. As legacy motion control systems age and original hardware reaches end-of-life, plant engineers and procurement teams increasingly seek a verified, drop-in replacement that preserves existing wiring, cabinet space, and drive program logic without forcing a full system redesign. This listing provides exactly that: a genuine or fully compatible 6SL3420-2TE11-7AA1 unit, pre-tested, in-stock, and ready for immediate dispatch from our Xiamen warehouse.

The 6SL3420-2TE11-7AA1 operates at a DC link voltage of 600 V and delivers a continuous output current of 1.7 A per axis (3 A peak), making it the correct choice for low-power dual-axis servo applications in machine tools, packaging lines, textile machinery, and semiconductor handling equipment. It communicates via the DRIVE-CLiQ interface — Siemens’ proprietary high-speed serial bus — and slots directly into a standard S120 booksize power section alongside a 6SL3100-1BE21-3AA0 Smart Line Module or an Active Line Module such as the 6SL3130-7TE21-6AA3, sharing the same DC bus rail without additional interface hardware.

When migrating from an earlier-generation SINAMICS S120 booksize unit — for example, a worn 6SL3420-2TE13-0AA1 or a discontinued 6SL3420-2TE15-0AA1 — the 6SL3420-2TE11-7AA1 retains the same physical booksize form factor, identical 24 V DC control supply connector pinout, and the same DRIVE-CLiQ topology. This means the existing motor power cables, brake control wiring, and encoder feedback lines connected to the 6FX2002 or 6FX5002 MOTION-CONNECT cable assemblies can be reused without re-termination, dramatically reducing retrofit labour time and the risk of wiring errors during recommissioning.

On the software side, the drive parameters stored in the SIMATIC S7-300 or S7-1500 controller — or in a SINUMERIK 840D sl CNC — do not require a full re-parameterisation. The axis object structure, drive object number, and PROFINET/PROFIBUS address assignments remain valid. Engineers typically need only to run a firmware update via STARTER or Startdrive commissioning software and execute a motor identification run to confirm encoder alignment, saving hours of downtime compared with a heterogeneous platform migration.

For sites running a mixed S120 cabinet with a 6SL3040-1MA00-0AA0 CU320-2 PN Control Unit or a 6SL3040-1MA01-0AA0 CU320-2 DP, the 6SL3420-2TE11-7AA1 integrates without any additional gateway or protocol converter. The DRIVE-CLiQ daisy-chain simply continues from the Control Unit through the Line Module and into this Double Motor Module, then on to any downstream 6SL3055-0AA00-3AA0 VSM10 Voltage Sensing Module or 6SL3060-4AE00-0AA0 DRIVE-CLiQ Hub Module if the topology requires it. Cabinet space is preserved because the booksize width of the 6SL3420-2TE11-7AA1 is identical to the unit it replaces, and no additional DIN rail adapters or mounting plates are needed.

Power supply compatibility is equally straightforward. The module draws its 24 V DC auxiliary supply from the same 6EP1333-3BA00 SITOP PSU100S or equivalent 24 V rail already present in the cabinet, and the DC link connection uses the standard S120 booksize bus bar system. There is no need to upsize the incoming supply transformer or recalculate cable cross-sections for the control voltage circuit.

For applications where the legacy system used an older MASTERDRIVES MC or a first-generation SIMODRIVE 611 dual-axis module, a migration to the 6SL3420-2TE11-7AA1 does require new motor power cables and a DRIVE-CLiQ encoder adapter (such as the 6SL3055-0AA00-2EB0 SME20 for resolvers or the 6SL3055-0AA00-2AA0 SMC10 for TTL encoders), but the mechanical mounting footprint of the booksize format and the standard 300 mm cabinet depth remain compatible with most existing enclosures. Our technical team can advise on the correct encoder module selection based on your motor nameplate data prior to order confirmation.

Compatibility Comparison Table

Seamless Upgrade Solutions

A successful migration to the 6SL3420-2TE11-7AA1 rarely involves this module in isolation. In practice, the retrofit scope typically extends to several adjacent components within the same S120 drive line or control cabinet. The 6SL3100-1BE21-3AA0 Smart Line Module provides the regulated DC bus supply for the booksize section and is the most common companion unit; if the existing Smart Line Module shows signs of capacitor ageing or fan wear, replacing it simultaneously with the Double Motor Module eliminates a second unplanned outage within months. Similarly, the 6SL3040-1MA00-0AA0 CU320-2 PN Control Unit — which hosts the drive firmware and manages the DRIVE-CLiQ topology — should be verified for firmware currency before commissioning the new module; an outdated CU320-2 firmware version can prevent the 6SL3420-2TE11-7AA1 from being recognised on the DRIVE-CLiQ bus.

On the motor feedback side, sites migrating from legacy resolver-based motors will need a 6SL3055-0AA00-2EB0 SME20 Sensor Module External to convert the resolver signal to DRIVE-CLiQ, while installations using incremental TTL encoders require the 6SL3055-0AA00-2AA0 SMC10 Sensor Module Cabinet-Mounted. Both modules mount on the same DIN rail section as the Double Motor Module and consume minimal additional cabinet width. For sites where the existing motor cables are being retained, the 6FX2002-5DA01 series MOTION-CONNECT power cables with pre-assembled connectors are the recommended choice for any sections that do require replacement, as they are rated for the S120 booksize connector system and are available in cut-to-length configurations.

Cabinet power integrity is another area that benefits from a concurrent review. The 6EP1333-3BA00 SITOP PSU100S 24 V / 5 A power supply unit is the standard 24 V DC source for S120 booksize control electronics; if the existing unit is more than seven years old, proactive replacement during the same maintenance window avoids nuisance trips caused by output voltage droop under transient load. Finally, for sites that require PROFIBUS DP connectivity alongside PROFINET — for example, where a legacy SIMATIC S7-300 CPU communicates via DP while a newer S7-1500 uses PN — the 6SL3040-1MA01-0AA0 CU320-2 DP variant of the Control Unit provides both interfaces simultaneously, making it a practical upgrade path that avoids a full PLC migration.

Retrofit Guidance FAQ

Q: Can I reuse my existing motor power cables when replacing with the 6SL3420-2TE11-7AA1?
A: Yes. The motor power output connectors on the 6SL3420-2TE11-7AA1 use the standard S120 booksize X1/X2 connector format. Provided your existing MOTION-CONNECT cables are in good condition and correctly rated, they can be reconnected without modification. Verify cable insulation resistance before re-energising.

Q: Do I need to re-download the drive program after swapping the module?
A: The drive parameters are stored in the CU320-2 Control Unit, not in the Double Motor Module itself. After physical replacement, the Control Unit will detect the new module via DRIVE-CLiQ and prompt a firmware download to the module. A motor identification run (rotating or stationary) is recommended to confirm encoder offset and motor model accuracy.

Q: Is the 6SL3420-2TE11-7AA1 compatible with PROFIBUS DP and PROFINET simultaneously?
A: The Double Motor Module itself communicates exclusively via DRIVE-CLiQ to the Control Unit. The fieldbus interface (PROFIBUS DP or PROFINET) is managed by the CU320-2 Control Unit. The module is therefore compatible with both fieldbus variants depending on which CU320-2 version is installed.

Q: What physical space does the 6SL3420-2TE11-7AA1 require in the cabinet?
A: The booksize format width is 50 mm. Cabinet depth requirement is 270 mm (standard S120 booksize). The unit mounts on the standard S120 booksize mounting rail and connects to the shared DC bus bar. No additional spacing or ventilation baffles are required beyond the standard S120 installation guidelines.

Q: Can this module replace a SIMODRIVE 611 dual-axis module directly?
A: A direct plug-in replacement is not possible due to the different bus architecture (SIMODRIVE 611 uses a proprietary drive bus, not DRIVE-CLiQ). However, a structured migration is feasible: the 6SL3420-2TE11-7AA1 can replace the 611 module functionally within a new S120 booksize section, retaining the existing motor mechanics and cabinet enclosure. New motor power cables, encoder adapter modules, and a CU320-2 Control Unit are required. Contact our technical team for a migration BOM.

Q: What communications protocols does the 6SL3420-2TE11-7AA1 support?
A: The module uses DRIVE-CLiQ for internal S120 system communication. Higher-level fieldbus protocols (PROFINET IRT/RT, PROFIBUS DP, EtherNet/IP via CBE20 option board) are handled at the CU320-2 Control Unit level. PROFIdrive profile is supported for motion control integration with SIMATIC and third-party PLCs.

Warranty Assurance

Every 6SL3420-2TE11-7AA1 unit dispatched from TOPNLMS carries a 12-month warranty covering manufacturing defects and functional failures under normal operating conditions. Prior to shipment, each unit undergoes a multi-point outgoing inspection that includes DC link capacitor pre-charge verification, DRIVE-CLiQ interface communication test, output IGBT switching check, and control supply input range validation. Units that do not pass all inspection checkpoints are quarantined and not offered for sale.

In the event of a warranty claim, TOPNLMS provides a replacement-first policy: a verified replacement unit is dispatched within 3 business days of claim approval, minimising production downtime while the returned unit is evaluated. Warranty claims are processed via email at [email protected] with photographic evidence of the fault and the original order reference. Return shipping costs for confirmed warranty faults are covered by TOPNLMS.

Stock is maintained in our Xiamen facility with same-day dispatch available for orders confirmed before 14:00 CST. International shipments are routed via DHL Express, FedEx International Priority, or UPS Worldwide Expedited depending on destination, with typical transit times of 3–7 business days to Europe, North America, and Southeast Asia. A commercial invoice and packing list are provided with every shipment to facilitate customs clearance. HS code 8537.10 applies to this product category for most jurisdictions.

For volume procurement, OEM integration projects, or urgent plant-down situations requiring same-day quotation, contact our technical sales team directly:

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