Glossary
©NationalInstruments Corporation G-5 7344/7334Hardware User Manual
followingerror
trip point
the differencebetween the instantaneous commanded trajectory position
andthe feedback position
FPGA FieldProgrammable Gate Array
freewheel thecondition of a motor when power is de-energized and the motor shaft is
freeto 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
energizingboth windi ngs or phases simultaneously
G
Gnd ground
GND ground
H
half-step modeof a stepper motor—for a two phase motor this is done byalternately
energizingtwo windings and then only one. In half step mode, alternate
stepsare strong and weak but there is significant improvement in low-speed
smoothness overthe f ull-step mode.
hex hexadecimal
home switch (input) Aphysical position determined by the mechanical system or designer as the
referencelocation for system initialization. Frequently, the home position is
alsoregarded as the zero position in an absolute position frame of reference.
host computer computer into which the motion control board is plugged
I
ID identification
in. inches
index marker between consecutive encoder revolutions