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Encoder Counts and Line Speed Calculator

Calculate quadrature counts, roller travel resolution, line speed, encoder channel frequency and decoded count rate.

Worked example

A 1,000 PPR encoder with x4 decoding and a 1:1 shaft ratio produces 4,000 counts per roller revolution. A 100 mm roller travels about 0.07854 mm per count. At 60 roller RPM, line speed is 18.85 m/min.

Encoder PPR (cycles per channel revolution)Encoder revolutions per roller revolutionRoller diameter (mm)Roller RPM (negative = reverse)

Quadrature decoding

Counts per roller revolution: 4,000
Travel resolution (mm/count): 0.07853982
Line speed (m/min): 18.84955592
Encoder A-channel frequency (Hz): 1,000
Decoded count rate (counts/s): 4,000

Counts/revolution = PPR × decoding × shaft ratio. Travel/count = π × diameter ÷ counts/revolution. Check whether the encoder specification already states decoded counts, and compare channel frequency and count rate with the exact counter module limits. Slip, backlash and diameter variation are not modeled.

Reference: NI encoder measurements and decoding. Review inputs and results against the exact device and site requirements.