National Instruments 7334 - Manual (Page 59)

Glossary
© National Instruments Corporation G-7 7344/7334 Hardware User Manual
modulo position treat the position as within the range of total quadrature counts per
revolution for an axis
N
noise 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.
noninverting 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.
O
open-loop refers to a motion control system where no external sensors (feedback
devices) are used to provide position or velocity correction signals
P
PCI 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.
PID proportional-integral-derivative control loop
PIVff proportional-integral-velocity feed forward
port (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 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.
power cycling turning the host computer off and then back on, which causes a reset of
the motion control board