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Glossary
7344/7334 Hardware User Manual G-6 ni.com
I/O input/output—the transfer of data to and from a computer system involving
communications channels, operator interface devices, and/or motion
control interfaces
inverting the polarity of a switch (limit switch, home switch, and so on) in active
state. If these switches are active-low they are said to have inverting
polarity.
IRQ interrupt request
K
kkilo—the standard metric prefix for 1,000, or 10
3
, used with units of
measure such as volts, hertz, and meters
Kkilo—the prefix for 1,024, or 2
10
, used with B in quantifying data or
computer memory
L
LIFO Last-In, First-Out
limit
switch/end-of-travel
position(input)
sensors that alert the control electronics that physical end of travel is being
approached and that the motion should stop
M
m meters
MCS Move Complete Status
microstep The proportional control of energy in the coils of a Stepper Motor that
allow the motor to move to or stop at locations other than the fixed
magnetic/mechanical pole positions determined by the motor
specifications. This capability facilitates the subdivision of full mechanical
steps on a stepper motor into finer microstep locations that greatly smooth
motor running operation and increase the resolution or number of discrete
positions that a stepper motor can attain in each revolution.