Multi-axis servo drive
Siemens SINAMICS S120 multi-axis servo drive
Modular high-performance drive system covering single-axis and multi-axis machines, running servo or vector control for synchronous and induction motors via DRIVE-CLiQ.
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Need Siemens parts, a replacement or another suitable option? Send your part number or describe what the machine needs to do. We connect your requirement with experienced UK engineering and procurement support to help you get the right products, pricing and supply options. Your matched provider can take the enquiry through quotation and ordering to delivery and after-sales support.
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- 1Products
- 2Performance
- 3Environment
- 4Volumes
- 5Your spec
What are you specifying?
Select everything you need. A motor, drive and gearbox can be specified together as one axis.
Key specifications
| Power | 550–5,700,000 W |
|---|---|
| Supply | 1/3 AC 200-240 V; 3 AC 380-480 V; 3 AC 500-690 V; 47-63 Hz |
| Fieldbus | PROFINET, PROFIBUS DP, Modbus TCP, CANopen, EtherNet/IP (option card), DRIVE-CLiQ (system interface) |
| Axes | single-axis (Blocksize, Chassis AC/AC) and multi-axis (Booksize, Booksize Compact, Chassis, Cabinet Modules) |
| Safety | integrated functions incl. STO, SBC, SS1, SS2 - SIL 2 / PL d |
Summarised in our own words from Siemens AG's published data; series maxima, individual models vary. Last checked 2026-10-29. Source 1 · Source 2 · Source 3
Notes on this data
Power/format figures from 2017 US brochure (DRBR-S120X-0117) - may be dated; current product page publishes no figures. Siemens launched SINAMICS S220 (Oct 2025, 'building on the success of S120', CU320-3, up to 12 axes per control unit) - not described as an S120 replacement; S120 remains current. Current ratings not published in sources checked.
Specify Motion is not affiliated with Siemens AG. Siemens and SINAMICS S120 are used only to identify the product. Comparisons use published figures; always confirm against the current datasheet.
Siemens SINAMICS S120 replacement and alternative options
Use these supply-network options as a starting point for an engineering check. We can also help source the original Siemens part. Published series figures do not establish an exact-model or drop-in replacement: confirm ratings, fit, interfaces and approvals for your application.
A dual-axis low-voltage Kinco drive for AGV differential-drive wheels, with RS + CANopen or RS + pulse variants and built-in brake output.
Figures are the highest published for each series and are not always measured the same way. A higher figure is not automatically a better choice: mounting, duty cycle, feedback, connectors and approvals matter too. An engineer will check the fit against your application before recommending anything.
What a multi-axis servo drive is
A multi-axis servo drive controls two or more servo motors from one unit, usually sharing a power supply, DC bus and communication interface. Formats include compact two- to four-axis drives in one housing and modular systems with a common supply module and separate axis modules. Sharing the bus lets energy from a decelerating axis be used by others, reducing braking losses. Most connect to a motion controller or PLC over EtherCAT or another industrial Ethernet network.
When engineers choose a multi-axis servo drive
Choose a multi-axis drive for machines with several coordinated servo axes in one cabinet, such as robots, packaging machines and gantries. It saves space, wiring and cost per axis compared with single drives. The trade-offs are flexibility and fault isolation: axes share the supply, so a supply fault affects all axes, and replacing one module may need specific spare strategy. Mixing very different power levels can be limited by module ranges.
How to specify the Siemens SINAMICS S120
Send these with your enquiry and an engineer can confirm the right SINAMICS S120 variant or an equivalent:
- Number of axes and power per axis (A, kW)
- Supply voltage (V AC or DC)
- Network interface and cycle time
- Motor and feedback types
- Shared bus and regenerative energy handling
- Safety functions per axis
- Cabinet size and cooling
Common mistakes to avoid
- Sizing supply module for the sum of peaks without considering simultaneous demand
- Ignoring how one fault affects all axes
- Choosing modules without room for future axes
- Overlooking network cycle time with many axes
Typical applications
Siemens SINAMICS S120: frequently asked questions
Can you help replace Siemens SINAMICS S120 or source the original?
Send the full model code, quantity and required date. Our engineers can check original-part availability and assess suitable alternatives, including supply-network options where appropriate. We confirm compatibility and any changes needed before recommending a replacement.
What is the Siemens SINAMICS S120?
Modular high-performance drive system covering single-axis and multi-axis machines, running servo or vector control for synchronous and induction motors via DRIVE-CLiQ. Published series figures include power 550 W, power 5,700,000 W. It is made by Siemens AG; Specify Motion can help source it or propose an equivalent.
Who makes the Siemens SINAMICS S120?
The Siemens SINAMICS S120 is made by Siemens (Siemens AG) and is listed here for engineers comparing options. Specify Motion is not affiliated with Siemens AG; brand names are used only to identify the product.
What is the power of the Siemens SINAMICS S120?
The published series minimum power is 550 W. Individual models and sizes in the SINAMICS S120 range vary, so check the exact variant against your duty cycle, mounting and environment, or ask our engineers to confirm the right size for you.
Is there an alternative to the Siemens SINAMICS S120?
We can assess suitable replacement options. On published figures, Kinco FDS Two-in-One Low-Voltage DC Servo Drive (FDS-AB/CB/LB-D) is options to assess from our supply network. An engineer confirms the fit against your application before recommending anything.
What are the benefits of a shared DC bus?
On a shared DC bus, energy regenerated by a decelerating axis can be used by other axes that are accelerating, reducing the energy dissipated in braking resistors. It also reduces wiring and supply components. Sizing must consider simultaneous peak demand on the shared supply.
Are multi-axis drives cheaper than single-axis drives?
Typically, per axis, multi-axis drives cost less and take less cabinet space, because the supply, communication and housing are shared. The saving grows with the number of axes. For machines with only one or two axes, or widely separated axes, single drives can be simpler.
Further reading: How to select a multi axis servo drive · How to select a servo drive · Servo drives
Other multi-axis servo drive series
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