Rockwell Automation 1772-LS_LSP,D17726.8.6 PROG/OPER MANUAL-MINI PLC-2/05 - Manual (Page 244)

Glossary
Appendix B
BĆ8
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.
File Name
A means of identifying a file on a disk.
File Organization
method of ordering data records stored as a file, while also providing a way to
access stored records.
Flag Bit
A processor memory bit, controlled through firmware or a user program, used
to signify a certain condition. Example: battery low.
Floating Point
A data manipulation format used to locate the point by expressing the power of
the base, and which involves the use of two sets of digits. For example, for a
floating decimal notation, the base is 10, so the number 8,700,000 would be
expressed as 8.7(1)^.
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.
Hardware
The mechanical, electrical, and electronic devices that make up a programmable
controller and its application.
Header
A portion of a protocol data unit that contains protocol control information and
precedes user data, if present.
Hexadecimal Numbering System
A base 16 numbering system that uses the symbols 0,1,2,3,4,5,6,7,8,9, and
A,B,C,D,E,F.
High = True
A signal type where the higher of two voltages indicates a logic state of on (1).
See Low = True.
Hot Backup
A standby processor in a programmable controller system. It consists of a
primary and backup processor. If the primary processor fails, the backup
processor takes over processor operations.