Rockwell Automation 1772-LV Mini-PLC - 2/15 Programmable Controller (Series B) Programming and Operations - Manual (Page 195)

Glossary
Appendix B
BĆ2
Binary Coded Decimal (BCD)
A method used to express individual decimal digits (0 thru 9) in 4-bit binary
notation; e.g., the number 23 is represented as 0010 0011 in the BCD notation.
BCD DECIMAL
0000 0
0001 1
0010 2
0011 3
0100 4
0101 5
0110 6
0111 7
1000 8
1001 9
Binary Image
An exact copy of the states (“1” and “0”) of all bits in PC memory, including
the data table, program, data files, and message areas.
Binary Word
A related grouping of ones and zeroes having meaning assigned by position, or
numerical value in the binary system of numbers.
Bit
1) An acronym for binary digit; the smallest unit of information in the binary
numbering system. Represented by the digits 0 and 1. 2) The smallest division
of a PC memory word.
Bit Manipulation
The process of controlling and monitoring individual special-purpose data table
bits through user-programmed instructions in order to vary application
functions.
Bit Rate
The rate at which binary digits, or pulses representing them, pass a given point
in a communication line.
Bit Storage
A single bit in any unused data table word which may be individually energized
or de-energized without directly controlling any output. However, any storage
bit may be monitored as often as necessary in the user’s program in order to
control various outputs indirectly.
Block Diagram
A simplified schematic drawing.
Branch
A parallel logic path within a user program rung.