National Instruments NI-Motion, User Manual

Page: 291 / 305

Glossary
© National Instruments Corporation G-3 NI-Motion User Manual
E
encoder Device that translates mechanical motion into electrical signals; used for
monitoring position or velocity in a closed-loop system.
encoder resolution Number of encoder lines between consecutive encoder marker or Z-bit
indexes. If the encoder does not have an index output the encoder resolution
can be referred to as lines per revolution.
F
F farad
FIFO first-in, first-out
filter parameters Indicates the control loop parameter gains (PID gains) for a given axis.
filtering Type of signal conditioning that filters unwanted signals from the signal
being measured.
flash ROM Type of electrically reprogrammable read-only memory.
following error
trip point Difference between the instantaneous commanded trajectory position and
the feedback position.
full-step Full-step mode of a stepper motor—For a two-phase motor. this refers to
energizing both windings or phases simultaneously.
G
Gnd ground
GND ground
H
half-step Mode of a stepper motor—For a two phase motor, this refers to alternately
energizing two windings and then only one. In half step mode, alternate
steps are strong and weak, but there is significant improvement in
low-speed smoothness over the full-step mode.