Rockwell Automation 1772-LS_LSP,D17726.8.6 PROG/OPER MANUAL-MINI PLC-2/05 - Manual (Page 240)

Glossary
Appendix B
BĆ4
Bus
1) One or more conductors considered as a single entity that interconnect
various parts of a system. Example: a data bus or address bus. 2) An electrical
channel used to send or receive data.
Byte
Equals eight consecutive bits.
Cascading
A programming technique that extends the ranges of timer and/or counter
instructions beyond the maximum values that may be accumulated in a
single instruction.
Central Processing Unit (CPU)
The circuits in a programmable controller that control the interpretation and
execution of the user program stored in programmable controller memory.
Character
One symbol of a set of symbols which normally include alpha codes, numeric
codes, punctuation marks, and other symbols which may be read, stored,
or written.
Chassis
A hardware assembly used to house devices such as I/O modules, adapter
modules, processor modules, and power supplies.
Checksum
A character placed at the end of a data block which corresponds to the binary
sum of all characters in that block. A technique used for error detection.
Clear
To return memory to a non-programmed state; erased.
Clock
1) A pulse generator which synchronizes the timing of various logic circuits.
2) Circuitry used to measure time.
CMOS
Complementary Metal Oxide Semiconductor circuitry. See MOS.
Command
A function initiated by a user action
Communication Rate
See Baud.
Contact Histogram
A feature which allows a display (or printout) of the on and off times for any
selected data table bit.