Rockwell Automation 1772-LV Mini-PLC - 2/15 Programmable Controller (Series B) Programming and Operations - Manual (Page 198)

Glossary
Appendix B
BĆ5
Cursor
A means for indicting on a CRT screen the point at which data entry or editing
will occur. The intensified element may be at constant high intensity or flashing
(alternate high intensity and normal intensity). If flashing, additional data may
be necessary to complete the instruction.
Cursored Rung
The top rung in a multiple rung display. it is the only rung which can be altered
by means of the program panel in this display mode. (However, any other rung
can be moved to this cursored rung position through scrolling.)
Cycle
1) A sequence of operations that is repeated regularly. 2) The time it takes for
one such sequence to occur.
Data
A general term for any type of information.
Data Files
Groups of application data values stored after, and separate from, the user
program area in the PC memory in the data table. These Files are manipulated
by, and used with, the user’s program as the application requires formula
changes.
Data Highway
A single-cable, differential,half-duplex, serial data link which provides
communication among multiple stations which are separate PCs, computers,
and data terminals. It eliminates the need for separate, independently wired data
links. Whether communication or not, all stations may function independently.
Data Link
Equipment, especially transmission cables and interface modules, which permits
the transmission of information.
Data Manipulation
The process of altering and/or exchanging data between storage words through
user-programmed PC instructions in order to vary application functions.
Data Table
A major portion of PC memory which is monitored and controlled through both
PC instructions and processor electronics.
Data Transfer
The process of exchanging data between PC memory areas through
user-programmed PC instructions in order to vary application functions.
Debugging
Process of detecting, locating, and correcting mistakes in hardware or software.