590 Series DC Digital Drive Programming
D-57
Functional Description
ENCODER TYPE = QUADRATURE
A quadrature encoder uses 2 input signals (A and B), phase shifted by a quarter of a cycle (90°).
Direction is obtained by looking at the combined state of A and B.
Each edge received from the encoder increments the encoder count. There are 4 counts per line.
Speed is calculated using the following function:
SPEED HZ = filter
CountsPerSecond
Lines x 4
, FilterTime
A
B
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