Rotary encoder - analog and optical with hollow shaft
S21A

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.