Glossary
©
National Instruments Corporation
G-5
NI PCI-7342 Hardware User Manual
following error
trip point
the difference between the instantaneous commanded trajectory position
and the feedback position
FPGA
Field Programmable Gate Array
freewheel
the 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
H
half-step
mode of a stepper motor—for a two phase motor this is done by 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.
hex
hexadecimal
home switch (input)
A physical position determined by the mechanical system or designer as the
reference location for system initialization. Frequently, the home position is
also regarded as the zero position in an absolute position frame of reference.
host computer
computer into which the motion control board is plugged
I
I/O
input/output—the transfer of data to and from a computer system involving
communications channels, operator interface devices, and/or motion
control interfaces
ID
identification
in.
inches
