Rockwell Automation 1772-L8_LW_LWP_LX_LXP,D17726.5.8 User Manual - Manual (Page 428)

Glossary
Appendix D
D-9
File
(1) One or more data table words used to store related data. See File
Organization. (2) A collection of related records treated as a unit. The
records are organized or ordered on the basis of some common factor
called a key. Records may be fixed or vary in length and can be stored in
different devices and storage media.
File Address
The data table address of a file that determines to where, or from where,
data will be transferred or moved.
File Creation
Establishing or writing records for a file into some storage device to
provide later access by the processor or operator.
File Maintenance
(1) Adding, deleting, or changing the contents of records in a file. (2)
Reorganizing the structure of a file to improve access to records or to
change the storage space required.
File Management
(1) A term that defines the functions of creation, insertion, deletion, or
updating of stored files and records in files. (2) The operations that are
performed on files.
First-In-First-Out (FIFO)
The order that data is entered into, and retrieved from a file.
Flag Bit
A processor memory bit, controlled through firmware or a user program,
used to signify a certain condition. Example: Battery Low
Flow Chart
A graphical representation for the definition, analysis, or solution of a
problem. Symbols are used to represent a process or sequence of decisions
and events.
Force Off Function
A feature which allows the user to reset an input image table bit or
de-energize an output, independent of the processor program.
Force On Function
A feature which allows the user to set an image table bit or energize an
output, independent of the processor program.