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Glossary
7344/7334 Hardware User Manual G-8 ni.com
PWM Pulse Width Modulation—a method of controlling the average current in a
motor phase winding by varying the on-time (duty cycle) of transistor
switches
PXI PCI eXtensions for Instrumentation
Q
quadrature counts the encoder line resolution times four
R
RAM random-access memory
relative breakpoint sets the position breakpoint for an encoder in relative quadrature counts
relative position destination or target position for motion specified with respect to the
current location regardless of its value.
relative position mode position relative to current position
ribbon cable a flat cable in which the conductors are side by side
RPM revolutions per minute—units for velocity.
RPSPS or RPS/S revolutions per second squared—units for acceleration and deceleration.
RTR Ready to Receive
S
s seconds
servo specifies an axis that controls a servo motor
stepper specifies an axis that controls a stepper motor
stepper <1..4> Dir
(CCW)
direction output or counter-clockwise direction control
stepper <1..4> Step
(CW)
stepper pulse output or clockwise direction control