Rockwell Automation 1772-L8_LW_LWP_LX_LXP,D17726.5.8 User Manual - Manual (Page 422)

Glossary
Appendix D
D-3
Binary Coded Decimal (BCD)
A numbering system used to express individual decimal digits (0-9) in
4-bit binary notation.
Binary Word
A related group of ones and zeros that has meaning assigned by position,
or by numerical value in the binary system of numbers.
Bit (Binary digit)
The smallest unit of information in the binary numbering system.
Represented by the digits 0 and 1. The smallest division of a
programmable controller word.
Bit Manipulation
The process of controlling data table bits (On or Off) through user
instructions or keyboard entry.
Bit Rate
See Baud.
Bit Storage
A user-defined data table area in which bits can be set or reset without
directly affecting or controlling output devices. However, any storage bit
can be monitored as necessary in the user program.
Block
A group of words transmitted as a unit.
Block Length:
The total number of words transferred at one time.
Block Transfer:
A programming technique used to transfer as many as 64 words of data to,
or form, an intelligent I/O module.
Branch
A parallel logic path within a rung.
Buffer
(1) In software terms, a register or group of registers used for temporary
storage of data, to compensate for transmission rate differences between
the transmitter and receiving device. (2) In hardware terms, an isolating
circuit used to avoid the reaction of one circuit with another.
Burn
The process by which information is entered into PROM memory.