Rockwell Automation 1772-LV Mini-PLC - 2/15 Programmable Controller (Series B) Programming and Operations - Manual (Page 194)

Appendix
B
BĆ1
Glossary
AC Input Module
I/O module which converts various AC signals originating at user devices to the
appropriate logic level for use with the processor.
AC Output Module
I/O module which converts the logic levels of the processor to a usable output
signal to control a user’s AC load.
Active
A green diagnostic indicator on Allen-Bradley PC hardware that, when
illuminated, signifies normal communication exists between the processor and a
remote I/O chassis.
Acquisition
A function which obtains information from PC memory locations or data files
for use in data manipulation or data handling.
Address
A location in the processor’s memory; usually used in reference to the data
table.
Alternating Current (AC)
Current in which the charge-flow periodically reverses direction.
Application
Any machine or process which is monitored and controlled by a PC by means
of a user program.
Arithmetic Capability
The ability to do addition, subtraction, multiplication and division, with the PC
processor.
Backplane
A printed circuit card located in the back of a chassis. It has sockets into which
specific modules fit for interconnection.
Battery Low
1) A condition caused when the memory backup battery voltage drops low
enough to warrant battery replacement. 2) An indicator which signals this
condition.
Binary
A numbering system using only the digits 0 and 1. Also called “base 2.”