![]() Unlike incremental encoders that are a push only system that output a continuous stream of pulses whenever the shaft is turned, absolute encoders are a call and response system that output a bit or unique word that relates to discrete position only when they are interrogated by the controlling device. Learn more about quadrature encoders and encoding to achieve higher resolutions hereĪbsolute Encoder Resolution (Bits) Calculation Assuming the usage of quadrature encoders with bidirectional output (A and B channels), triggering from the rising and falling edges of the A channel and the B channel will generate four times as many pulses, or 4X encoding. If your encoders standard resolution doesn’t meet your application needs, there is another alternative based on how the signal is decoded through the users drive, PLC or Controller. Max encoder resolution = Operating Frequency x 60 / Max RPMĮxceeding this number will overwork the encoder’s processing capability, which will result in degraded signal output and cumulative error.įor example, if the encoder’s operating frequency is 125kHz and the maximum shaft speed is 1,000 RPM, the encoder ppr calculation for the maximum resolution the encoder supports is 7,500 pulses per revolution (PPR). Combined with the RPM of the application, the frequency response places a practical upper bound on the resolution that can actually be achieved for a particular system and encoder. Incremental Encoder Resolution (PPR) Calculationįor incremental encoders, the encoder electronics have a maximum frequency response, which limits how rapidly it can generate output pulses. ![]()
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