Rockwell Automation 1771-QB Linear Pos. - Manual (Page 170)

Appendix
A
AĆ1
Glossary of Terms & Abbreviations
Absolute Position: A position described by its distance from the zero point of a
coordinate axis.
Acceleration: The rate at which the speed of axis motion increases.
Adapter Module: A module that provides communication between an I/O
chassis and the programmable controller. It transmits I/O chassis input
data to, and receives output data from, the programmable controller.
Amplifier: A signal gain device whose output is a function of its input.
Analog: Used to describe a physical quantity, such as voltage or position, that
normally varies in a continuous manner.
Axis: A principal direction along which the movement of a tool or workpiece
occurs.
Axis Movement: The movement of a tool or workpiece along an axis.
Axis Position: The distance along the axis from a pre-defined origin (in the
positive or negative direction).
Backplane: A printed circuit board, located in the back of a chassis, that
contains a data bus, power bus, and mating connectors for modules
installed in the chassis.
BCD: Binary coded decimal.
Binary: A base 2 numbering system.
Binary Coded Decimal: A numbering system used to express individual
decimal digits (0 through 9) in four-bit binary notation.
Bit: A binary digit. The smallest unit of information, represented by 1 or 0. A
bit is the smallest division of a PLC word.
Block: A set of words handled as a unit.
Block Transfer: A programming technique used to transfer up to 64 data
words between an I/O module and the programmable controller.