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Glossary
© National Instruments Corporation G-7 NI-Motion User Manual
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.
sinusoidal commutation Method of controlling current in the windings of a brushless servo motor
by using the pattern of a sine wave to shape the smooth delivery of current
to three motor inputs, each 120° out of phase from the next.
stepper Specifies an axis that controls a stepper motor.
T
toggle Changing state from high to low, back to high, and so on.
torque Force tending to produce rotation.
totem pole Method of output capable of sinking and sourcing current.
trapezoidal profile Typical motion trajectory, where a motor accelerates up to the programmed
velocity using the programmed acceleration, traverses at the programmed
velocity, and then decelerates at the programmed acceleration to the target
position.
trigger Any event that causes or starts some form of data capture.
TTL transistor-transistor logic