National Instruments 7340 PCI Benutzerhandbuch

LIFO

last in, last out—data buffering technique where the newest values (last in) 
come out first

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

meters

MCS

Move Complete Status

microstep

proportional control of energy in the coils of a Stepper Motor that 
allows 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.

modulo position

treat the position as within the range of total quadrature counts per 
revolution for an axis

noise

undesirable electrical signal—noise comes from external sources such as 
the AC power line, motors, generators, transformers, fluorescent lights, 
soldering irons, CRT displays, computers, electrical storms, welders, radio 
transmitters, and internal sources such as semiconductors, resistors, and 
capacitors. Noise corrupts signals you are trying to send or receive.

noninverting

polarity of a switch (limit switch, home switch, and so on) in active state. 
If these switches are active-high, they are said to have non-inverting 
polarity.