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N
noise
noninverting
O
open-loop
P
PCI
PID
PIVff
port
position breakpoint
power cycling
PWM
PXI
© National Instruments Corporation
an undesirable electrical signal—noise comes from external sources such
as the AC power line, motors, generators, transformers, fluorescent lights,
soldering irons, CRT displays, computers, electrical storms, welders, radio
transmitters, and internal sources such as semiconductors, resistors, and
capacitors. Noise corrupts signals you are trying to send or receive.
the polarity of a switch (limit switch, home switch, etc.) in active state. If
these switches are active-high, they are said to have non-inverting polarity.
refers to a motion control system where no external sensors (feedback
devices) are used to provide position or velocity correction signals
Peripheral Component Interconnect—a high-performance expansion bus
architecture originally developed by Intel to replace ISA and EISA. It is
achieving widespread acceptance as a standard for PCs and workstations;
it offers a theoretical maximum transfer rate of 132 MB/s.
proportional-integral-derivative control loop
proportional-integral-velocity feed forward
(1) a communications connection on a computer or a remote controller
(2) a digital port, consisting eight lines of digital input and/or output
position breakpoint for an encoder can be set in absolute or relative
quadrature counts. When the encoder reaches a position breakpoint, the
associated breakpoint output immediately transitions.
turning the host computer off and then back on, which causes a reset of a
the motion control board
Pulse Width Modulation—a method of controlling the average current in a
motors phase windings by varying the on-time (duty cycle) of transistor
switches
PCI eXtensions for Instrumentation
G-7
Glossary
7344 Hardware User Manual
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