Omron C6 Servo Lands in the UK: 26-Bit Feedback and Pluggable Wiring for Light-Duty Axes

Omron has brought its C6 AC servo system to the UK as a cost-focused option for light-duty axes. Announced on the UK site on 7 October 2026, the C6 covers 50 W to 7.5 kW, uses a 26-bit encoder that can be configured as incremental or absolute with battery backup, and pairs a 3.5 kHz drive response with EtherCAT and Sysmac Studio commissioning. The most practical details are mechanical: drive height stays constant up to 3 kW, and power, motor, encoder and integrated I/O all land on pluggable connectors.

Key takeaways

• Power range: 50 W to 7.5 kW. Omron lists 230 V models from 50 W to 1.5 kW and 400 V models from 850 W to 7.5 kW.
• Feedback: 26-bit encoder, configurable as incremental or absolute with battery backup. That is 67,108,864 positions per revolution, eight times a 23-bit encoder.
• Response: 3.5 kHz drive frequency response, with full closed-loop control available when a second encoder is fitted.
• Installation: constant drive height through the range up to 3 kW, plus pluggable power, motor, encoder and integrated I/O connectors.
• Integration and safety: EtherCAT, Omron NX machine controllers and Sysmac Studio; hardwired Safe Torque Off certified to Cat. 4, PLe and SIL 3.
• Positioning: the C6 is aimed at light-duty applications. The existing 1S range continues for high-performance axes up to 15 kW.

What Omron actually announced

The C6 is not a like-for-like replacement for every Omron servo. It is a third tier: a lower-cost platform for axes that need modern feedback and a fast EtherCAT link, but not the full performance or safety feature set of the 1S and 3S ranges. Omron describes the target as light-duty applications, where the balance of performance, functionality and value matters more than maximum continuous duty.

Why 26 bits and 3.5 kHz matter on a real axis

Encoder resolution is often quoted as a headline number, but it is worth translating. A 26-bit encoder divides one revolution into 67,108,864 counts. A 23-bit encoder divides it into 8,388,608 counts. The C6 therefore offers eight times the raw resolution of the 23-bit feedback that was common on earlier generations of general-purpose servo motors.

That matters most at low speed. More counts per revolution means smoother interpolation between encoder positions, finer electronic gearing and less visible quantisation when an axis creeps into position. It does not, by itself, improve accuracy: backlash, compliance, coupling stiffness and thermal growth can all be larger than the encoder step. High resolution helps a good mechanism perform better; it cannot rescue a weak one.

The 3.5 kHz figure describes how quickly the drive responds to a command change or a load disturbance. A wider response band allows the current and velocity loops to react in less time, which supports faster settling after a move and stiffer rejection of torque disturbances. In practice, that is useful on short indexing moves, flying-shear style synchronisation, packaging infeed axes and small robots that must settle quickly before the next operation. The benefit still depends on tuning, inertia matching and a mechanically sound frame.

Constant height and pluggable connectors: the cabinet and maintenance angle

Omron has designed the C6 around installation efficiency rather than maximum power density. The drive keeps the same height through the range up to 3 kW, so a panel layout does not need to be redesigned when an axis is upsized within that band. Busbar runs, duct routes and mounting plates can be planned once. Above 3 kW the constant-height guarantee no longer applies, which is the point where cabinet dimensions and airflow need to be checked again.

The pluggable connectors are the more interesting detail for maintenance. Power, motor, encoder and integrated I/O each terminate in a plug rather than a terminal strip. That allows a harness to be built and tested before it reaches the panel, reduces the chance of a wire landing in the wrong terminal, and makes a drive swap a connector operation rather than a re-termination job.

There are still checks. Connector families have mating-cycle limits, and repeated vibration can loosen a plug that is not latched correctly. Encoder cables need the right bend radius and strain relief, especially on a moving gantry. Before standardising on the C6, record the connector part numbers, cable lengths and pinouts for each axis, and keep a commissioning archive from Sysmac Studio. A spare drive is only a fast swap if the project file, firmware version and connector set are also available.

Where the C6 fits in a mixed servo fleet

The C6 is a new platform, so the immediate spares question is not about C6 stock; it is about the servo axes already on the floor. Most plants do not standardise overnight. A new machine with C6 drives will often sit beside Yaskawa Sigma series amplifiers, Mitsubishi motors with 22-bit absolute feedback, B&R servo motors and Siemens drive systems with dedicated encoder cables.

That mixed reality changes what a spare-parts list should contain. The critical items are usually the parts that stop an axis rather than the newest drive: a replacement amplifier of the same frame size, a motor with the correct brake and shaft options, an encoder cable with the right connector and length, and the 24 V supply and protection components that keep the panel alive. Our catalogue covers those adjacent items, including servo drives, cables and connectors and power supplies. The Yaskawa and B&R brand indexes are useful for matching a frame number before a repair.

Useful reference points include the Yaskawa SGDV 750 W Sigma-5 drive and the SGDH 3 kW Sigma-II drive for older Yaskawa axes, the SGMGV 1.3 kW servo motor when a motor rather than a drive is the failure point, and the Mitsubishi HG-KR73BJ as an example of a 22-bit absolute-encoder motor still common in compact machines. For B&R systems, the 8LSA57 servo motor is a representative frame. Feedback failures often trace back to the cable, so the Siemens V90 10 m encoder cable and the 15 m Drive-CLiQ encoder cable are worth keeping in the spares review.

Panel infrastructure is just as important. A compact servo drive still needs a stable 24 V rail and correct branch protection. The ABB SD833 24 V 10 A DIN-rail supply, the Siemens 3RV6021 motor protection circuit breaker and the 3RT6015 contactor are the kind of parts that turn a single drive fault into a full-line stop when they are missing from the shelf.

What to check before specifying a C6 axis

• Duty cycle and inertia. The C6 is positioned for light-duty applications. Match the motor inertia to the load, and check the continuous torque at the actual speed rather than the peak figure alone.
• Motor variant. Omron offers low-inertia and high-inertia motors, with 3000 rpm and 1500 rpm variants depending on frame and voltage. Brake, oil seal and shaft key options change the model code.
• Supply and protection. Confirm whether the axis is 230 V or 400 V, then size the branch protection, contactor and 24 V supply for the drive plus its inrush current.
• Feedback mode. Choose absolute with battery backup when multi-turn position must survive a power cut. Choose incremental when a homing routine is acceptable and battery maintenance is unwanted.
• Safety architecture. The C6 provides hardwired STO. If the risk assessment calls for Safety over EtherCAT functions such as SS1, SLS, SSM or SLT, the C6 is not the right platform; compare the 1S and 3S ranges.
• Controller and cycle time. Check the NX controller axis count, the EtherCAT cycle and the Sysmac Studio project version before the panel is built, not after the first power-up.

Frequently asked questions

What power range does the Omron C6 servo cover?

Omron lists 50 W to 7.5 kW. The 230 V models run from 50 W to 1.5 kW, while the 400 V models run from 850 W to 7.5 kW. The launch notice describes 230 V single-phase and 400 V three-phase supplies.

Is the C6 encoder absolute or incremental?

It is a 26-bit encoder that can be configured either way. Absolute mode uses battery backup to retain multi-turn position; incremental mode removes the battery but requires a homing routine after power loss.

What does a 3.5 kHz frequency response mean?

It describes how quickly the drive can respond to a command or load disturbance. A higher figure supports faster settling and stiffer control, provided the mechanics and tuning allow it.

Does the C6 run on EtherCAT with Sysmac Studio?

Yes. The C6 is an EtherCAT servo integrated with Omron NX machine controllers and configured in Sysmac Studio, alongside NX I/O, vision and safety products.

Which safety functions does the C6 support?

Hardwired Safe Torque Off certified to Cat. 4, PLe and SIL 3. The C6 does not provide Safety over EtherCAT; SS1, SLS, SSM and SLT are available in the high-performance 1S and 3S ranges instead.

Is the C6 a replacement for the 1S series?

No. Omron positions the C6 for light-duty axes and keeps the 1S for high-performance applications up to 15 kW. The two ranges are intended to sit side by side.

Sources

• Omron UK, "OMRON launches the cost-effective C6 Series servo system ideal for light-duty applications", 7 October 2026.
• Omron UK, C6 Drives product page, accessed 28 October 2026.
• Omron UK, C6 Motors product page, accessed 28 October 2026.
• Omron, C6 Series brochure, Cat. No. I930-E1-01, October 2026.

Talk to us

If you are specifying a C6 axis, or keeping an older servo line running while a new machine is commissioned, send us the drive model, motor code and fault history. We will check the compatible hardware and the realistic lead time. Contact our team.