Glossary
7344/7334Hardware User Manual G-8 ni.com
PWM PulseWidth Modulation—a method of controlling the average current in a
motor phase winding by varyingthe 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
relativebreakpoint setsthe position breakpoint for an encoder in relative quadrature counts
relativeposition destination or targetposition f or motion specifiedwith resp ectt o the
currentl ocation regardlessof its value.
relativeposition mode position relativeto current position
ribbon cable af lat cable in which the conductors are side by side
RPM revolutionsper minute—units for velocity.
RPSPSor R PS/S revolutionsper second squared—units for acceleration and deceleration.
RTR Ready to Receive
S
s seconds
servo specifies an axis that controls a servo motor
stepper specifiesan 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