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Glossary
NI 7340 User Manual G-4 ni.com
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 indexes (marker or
Z-bit). 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—data buffering technique that functions like a shift register
where the oldest values (first in) come out first
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
FPGA Field Programmable Gate Array
freewheel condition of a motor when power is de-energized and the motor shaft is free
to turn with only frictional forces to impede it
full-step full-step mode of a stepper motor—for a two phase motor this is done by
energizing both windings or phases simultaneously
G
Gnd ground
GND ground