RESOLUTE™ absolute encoder system with REXA30 rotary (angle) ring
- Serial interfaces: BiSS® C, FANUC, Mitsubishi, Panasonic, Siemens DRIVE-CLiQ®, Yaskawa
- Readhead size: 36 x 16.5 x 17.2 mm
- Resolutions to 32 bits/rev at 8 500 rpm
- Installed accuracy to ±1 arc second
- Vacuum compatible, Extended Temperature Range and side cable outlet versions available
- Thick cross-section ring
- Excellent motion control performance
- Exceptionally high dirt immunity
- Wide set-up tolerances
- Less than 10 nm RMS jitter for improved positional stability
- ±40 nm Sub-Divisional Error for smooth velocity control
- Optional Advanced Diagnostic Tool
What is RESOLUTE?
RESOLUTE is a true absolute, fine pitch optical encoder system that has excellent dirt immunity, and an impressive specification that breaks new ground in position feedback. It is the world's first absolute encoder capable of 32-bit resolution at 36 000 rpm. Ultra low SDE and jitter result in a rotary encoder system that outperforms any other encoder in its class.
Winner of a Queen's Award for Enterprise 2015 in the Innovation category
What is REXA30 ring?
REXA30 is a one-piece stainless steel ring with 30 µm pitch absolute graduations marked directly on the periphery. Its larger cross-section allows for the reduction in all installation errors apart from eccentricity, which is easily corrected using the average result of two Resolute readheads. Featuring total installed accuracy up to ±1 arc second, zero coupling losses, and exceptional repeatability.
REXA30 is available in a range of sizes (Ø52 mm to Ø417 mm), all of which have a large internal diameter for flexible integration. The non-contact format eliminates backlash, shaft wind-up (torsion) and other mechanical hysteresis errors that are inherent in traditional enclosed encoders.
Why choose this encoder system?
Easy fault finding and servicing
The Advanced Diagnostic Tool ADTa‑100 acquires comprehensive real-time data from RESOLUTE™ encoder readheads. The information is displayed via the user-friendly ADT View software interface. Whilst in most cases the integral set-up LED on the encoder is sufficient for setting up the system, the ADT can be used to aid more challenging installations. The ADT can also report on encoder performance and assist system fault finding to avoid lengthy machine downtime.
Excellent motion control performance
RESOLUTE's industry-leading performance is the result of a sophisticated, reliable and innovative method of operation. Crucially, the system uses a single track non-repeating “bar code” scale format with a nominal pitch of 30 µm. With its sophisticated optical design the RESOLUTE readhead captures a near-instantaneous image of this scale which, when analysed, allows a unique position to be identified at speeds of up to 100 m/s. The system allows position to be determined with resolution as small as 1 nanometre (1 billionth of a metre) and with low noise (jitter below 10 nm RMS) and SDE (Sub-Divisional Error, the error within a scale period) of just ±40 nm. This provides encoder feedback of superior fidelity, to ensure smoother velocity control and rock-solid positional stability.
Wide set-up tolerances
RESOLUTE does not follow the conventional technique of using dual tracks side-by-side (one incremental, one absolute) which inherently suffers de-phasing problems when small amounts of angular misalignment are introduced. Instead, this absolute encoder features a single track, optical absolute scale, combining both the absolute position and embedded phase information into one single code. This technology provides RESOLUTE with far wider set-up tolerances (yaw tolerance ±0.5°) for quick and easy installation and superior long-term reliability, even if the motion axes settle or move over time. To further aid installation and diagnostics, there is an integral set-up LED on the readhead.
External interface option
Siemens DRIVE-CLiQ external interface
- Required for Siemens DRIVE-CLiQ serial interface
- Also available in dual head input for high accuracy rotary systems
- Displays communication alarms
- Duplicates readhead LED
No external interface is required for the other available serial interfaces.
Optional Advanced Diagnostic Tool ADTa-100
The RESOLUTE encoder system is compatible with the Advanced Diagnostic Tool ADTa-100 and ADT View software. They provide comprehensive real-time encoder data feedback to aid more challenging installations and diagnostics. The intuitive software interface can be used for:
- Remote calibration
- Signal optimisation over the entire axis length
- Digital readout of encoder position (relative to the scale)
- Exporting and saving data
- Setting zero
|Serial interfaces||Description||Data sheet||Compatible products|
Renishaw supports BiSS C (unidirectional) open protocol for absolute encoders. BiSS C is a high-speed serial interface, perfect for dynamic axes that require high acceleration, silky-smooth velocity control, excellent repeatability and rock-solid positional stability.
RESOLUTE with FANUC (α and αi) serial interface is available for rotary and linear applications.
RESOLUTE with Mitsubishi serial interface is available in rotary and linear forms. RESOLUTE is compatible with the J4 and J5 series of servo drives, and the MDS-D2/DH2/DM2/DJ drives for machine tool applications.
RESOLUTE with Panasonic serial interface is available in linear and rotary forms. Compatible with the A5 and A6 series of drivers, it provides high resolution repeatable feedback for better servo and speed control.
RESOLUTE with Siemens DRIVE-CLiQ serial interface is available (using external interface) for linear and rotary applications. Siemens DRIVE-CLiQ is the innovative, powerful communications interface to connect encoder and direct measurement systems with SINUMERIK and SINAMICS drive components.
RESOLUTE with Yaskawa serial interface is available in rotary and linear forms, and is compatible with Sigma-5 and Sigma-7 SERVOPACKs.
One-piece ultra high accuracy absolute coded stainless steel ring
Readhead size (LxWxH)
36 mm x 16.5 mm x 17.2 mm
Nominal 30 μm
|Coefficient of thermal expansion at 20 °C||15.5 ±0.5 μm/m/°C|
Ring outer diameter
52 mm to 417 mm
Total installed accuracy (with 2 readheads)
(≥100 mm diameter) ±1 arc second
(75 mm diameter) ±1.5 arc seconds
(≤57 mm diameter) ±2 arc seconds
(See data sheet for details)
8 500 rpm (on 52 mm ring)
BiSS C, FANUC, Mitsubishi, Panasonic, Siemens DRIVE-CLiQ**, Yaskawa
BiSS C: 18-bit, 26-bit and 32-bit
FANUC: 23-bit and 27-bit
Mitsubishi 2-wire: 23-bit
Mitsubishi 4-wire: 23-bit and 27-bit
Panasonic: 23-bit and 32-bit
Siemens DRIVE-CLiQ**: 26-bit and 29-bit
Yaskawa (rotary servomotors): 24-bit
Yaskawa (fully closed loop control): 23-bit, 26-bit and 30-bit
Sub-Divisional Error (SDE)
Up to 10 m cable lengths with D-type connectors (9 pin or 15 pin), flying lead, FANUC compatible connector, LEMO, and M12
5 V ±10%, 250 mA @ 5 V (terminated)
300 m/s2 max @ 55 Hz to 2 000 Hz
1 000 m/s2, 6 ms, ½ sine
0 °C to +80 °C
Refer to data sheets for full details.
†Other serial interfaces are continually being added.
**For Siemens DRIVE-CLiQ specifications, refer to RESOLUTE Siemens DRIVE-CLiQ data sheet.