National Instruments NI-Motion User Manual page 294

Glossary
P
PCI
PID
PIVff
port
position breakpoint
PWM
PXI
Q
quadrature counts
R
RAM
relative breakpoint
relative position
relative position mode
NI-Motion User Manual
peripheral component interconnect—a high-performance expansion bus
architecture originally developed by Intel to replace ISA and EISA. PCI 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) Communications connection on a computer or a remote controller;
(2) Digital port, consisting of eight lines of digital input and/or output.
Allows a motor to stop at a given point so that another action, such as a data
acquisition or an image acquisition, can take place. You can set position
breakpoints in absolute or relative quadrature counts. When the encoder
reaches a position breakpoint, the associated breakpoint output
immediately transitions.
pulse width modulation—Method of controlling the average current in
a motor phase winding by varying the on-time duty cycle of transistor
switches.
PCI eXtensions for Instrumentation
Encoder line resolution multiplied by four.
random-access memory
Sets the position breakpoint for an encoder in relative quadrature counts.
Destination or target position for motion specified with respect to the
current location, regardless of its value.
Position relative to current position.
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