Rotary encoder - incremental and optical with hollow shaft
S21D | S21H | S21W | S21C
The S21 is a cost-effective, optical rotary encoder with a hollow shaft. It is easy to install and achieves a high data rate and resolution. The compact device has its own bearing system and a high-quality, fiberglass-reinforced plastic housing. It therefore achieves protection class IP40. The S21 offers significant performance advantages in applications that would otherwise be limited when using traditional and modular encoder solutions.
A flexible mounting bracket enables a wide range of applications. It tolerates greater shaft end mounting tolerances than other modular encoder systems.
This encoder series is able to provide different output signals: incremental or digital data formats (also with commutation signal) or analog signals (1 Vpp). The incremental versions offer higher resolutions of over 2 million pulses per revolution.
As an alternative to the conventional digital and analog encoder signals, the absolute encoder of this series should be mentioned. The new encoder with 16-bit binary or gray code offers a high number of measuring steps per revolution. A low position error enables smooth drive behavior and remarkable positioning accuracy. High bandwidth and noise immunity ensure excellent speed, stability and control performance in industrial environments.
The S21 also supports the BiSS C protocol for incremental and absolute versions. This fast serial protocol is ideal for dynamic axes that require high acceleration, smooth speed control, excellent bidirectional repeatability and high positioning accuracy. In addition, this encoder is easy to program and configure. In addition, the mechanical dimensions are the same for all variants, which simplifies replacement and design in general.
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Features
-
Compact mechanical dimensions (53.34 mm outer diameter and 31.12 mm high) for easier system integration - Robust bearings with industrial ball bearings enable a shaft speed of up to 10,000 rpm
- Simplified direct mount design
- Software configurable resolution
- Circuit protection: short circuit, reverse polarity, transient voltage suppression
- ASIC-based design for excellent customization and reliability
- Fast serial data communication BiSS C via RS-485 differential driver pair
- High noise immunity
- RoHS compliant
Options
Wide range of lines and pulses: up to 4096 incremental lines, over 2 million pulses- Range of shaft diameters: up to 12.7 mm
- 4, 6, 8, 10, & 12-pole commutation tracks, single-ended TTL
- Absolute position data formats Gray code or binary
- Absolute position value from 8- to 16-bit SSI output with user clock input pulse
- Fast serial SSI communication via 2-wire or 3-wire RS-485
- Absolute position value on 13-bit parallel output per user connection
- Customized cable and/or connector
Incremental encoder models
| Characteristics | Units | S21D | S21H | S21W | S21C | |
|---|---|---|---|---|---|---|
| Type | digital | digital, high-resolution | digital with commutation | BiSS C | ||
| Output signal | Differential A, B and index | Differential A, B and index | Differential A, B and index | Serial | ||
| Resolution | 1,000 to 409,600 | 2,000 to 2,048,000 | 2,048 to 2,048,000 | 2,000 to 2,048,000 | ||
| Output frequency max | 500 kHz | 1.5 MHz | 500 kHz | 5 MHz clock | ||
| Output | amplified signal | amplified signal | BiSS interface | |||
| Power supply | 5 VDC, 30 mA | 5 VDC, 60 mA | 5 VDC, 35 mA | 5 VDC, 104 mA | ||
| Shaft bore max. | mm | 12.7 | ||||
| Shaft length min. | mm | 6.35 | ||||
| shaft length max. | mm | 28.58 | ||||
| Axial shaft movement | mm | ±0.635 | ||||
| Speed max. | rpm | 10,000 | ||||
| Operating temperature | °C | -25 to 100 | -25 to 85 | -25 to 100 | 0 to 70 | |
| Storage at | °C | -55 to 125 | -40 to 100 | -55 to 125 | -40 to 125 | |
| Relative humidity | % | 90 non-condensing | ||||
| Shock | g | 100 (6 ms duration) | ||||
| Vibration | Hz | 10 - 2,000 at 10 g | ||||
| Protection class | IP40 |
Connections for digital encoders
| Modell | Stecker | Pin | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | ||
| S21D, S21H | DF11-8DP-2V | Signal | A | A- | B | B- | Z | Z- | VDC | GND | - | - | - | - | - | - | - | ||
| S21W | F1-W15P-HFE | Signal | VDC | GND | N/A | Z- | Z | B- | B | A- | A | N/A | W | N/A | V | N/A | U | ||
| S21C | B10B-ZR (LF)(SN) | Signal | SLI+ | SLI- | MAO- | MAO+ | MA+ | MA- | SLO- | SLO+ | 5VDC | GND | - | - | - | - | - | - |
Drawing
S21D digital 5 V TTL
S21H digital 5 V TTL high resolution
S21W digital 5 V TTL high-resolution with commutation signal
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