Posital Optocode encoders with SSI interface

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Updated versions of the Posital Optocode encoders with SSI interfaces have been released, which now include support for additional output drivers for incremental signals (RS422/TTL and push-pull/HTL), resolutions of 1024, 2048, 4096, 8192 or 16384 PPR per output, a reference impulse and an extended voltage range covering 4.5 to 30 VDC.

Additional diagnostic functions can be implemented via an alarm bit for self-diagnosis of the Opto-ASIC and hardware/software monitoring. They are suitable for use in wind power applications, where both rotor speed and the absolute position of the rotor must be determined.

The encoders retain features of previous models, such as the integrated preset function that allows users to assign a preset value to the current position of the shaft. A version with a hardware preset push-button featuring two integrated LEDs for easy status and error diagnosis is optionally available.

The synchronous serial interface enables the operation of up to 10 encoders on one data line. They are based on a single-turn sensor with an integrated Opto-ASIC which provides a resolution of 16 bits per revolution. Additionally, a maximum of 16,384 revolutions (14-bit) can be registered in multiturn mode. Available as solid, hollow and hub shaft versions, the units can be fitted with a connector or a cable exit. They provide a maximum transfer rate of 2 MHz and ensure cycle times below 25 µs. The housings of the encoders provide IP65 protection (IP64 on the shaft side, up to IP66 with an optional shaft seal).