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Term Definition

A grouping or a number of bits in a sequence that is treated as a unit.

Word length

The number of bits in a word. In a programmable controller, unless stated otherwise, a word has 16 data bits.


The magnitude of a force times the distance through which that force is applied. (work = force x distance)

Work area

A portion of the data table reserved for specific processor functions.


1) A powerful stand-alone computer of the sort used in applications requiring considerable calculating or graphics capability. 2) A combination of input, output, and computing hardware that can be used for work by an individual. 3) A microcomputer or terminal connected to a network.

Wrap around

In a display, when data is moved in one direction through the display, or a cursor is moved though the data, as the data displayed or the cursor position reaches one extreme end, it jumps to the other extreme end so that the movement can continue.


To load data into somewhere (memory, an output, another station).


The axis of motion that is always horizontal and parallel to the work holding surface.

x-y matrix

A group of rows and columns. The x-axis is the horizontal row, and the y-axis is the vertical column. An x-y matrix is the reference framework for two-dimensional structures, such as mathematical tables, display screens, digitizer tablets, dot matrix printers and 2-D graphics images.

x-y-z matrix

A three-dimensional structure. The x and y axes represent the first two dimensions; the z axis, the third dimension. In a graphic image, the x and y denote width and height; the z denotes depth.


Extensible markup 


Transmitter. A device that sends data.


An asynchronous communication protocol for the receiving station to control the flow of data from the transmitting station. When the receiving station cannot continue to receive any more data, as when its buffer is full, it transmits an XOFF (DC3) control character that tells the sender to stop. When the receiving station is again able to process more data, it transmits an XON (DC1) control character that tells the sender to resume transmission. This protocol is also referred to as software handshaking.


See x-y matrix.


Angular rotation about the vertical axis, typically the Z-axis for X-Y-Z.

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