271 Publication 1747-UM011G-EN-P - June 2008
Glossary
We use the following terms throughout this manual. Refer to the
Allen-Bradley Industrial Automation Glossary, publication AG-7.1, for
a complete guide to Allen-Bradley technical terms.
address
A character string that uniquely identifies a memory location. For
example, I:1/0 is the memory address for data in Input file word 1, bit
0.
AIC+ Advanced Interface Converter
A device that provides RS-232 isolation to an RS-485 half-duplex
communication link. (catalog number 1761-NET-AIC.)
application
1) A machine or process monitored and controlled by a controller.
2) The use of computer- or processor-based routines for specific pur-
poses.
auto answer
Type of modem that has self-contained timeouts and tests. It can
answer and terminate a call automatically.
backplane current draw
The amount of current the module requires from the backplane. The
sum of the backplane current draw for all modules in a chassis is used
to select the appropriate chassis power supply.
baud rate
The speed of communication between devices on a network. All
devices must communicate at the same communication rate. For
example, the DH-485 network devices default to 19.2 Kbaud.
bit
The smallest unit of memory used in discrete or binary logic, where
the value 1 represents ON and 0 represents OFF.
block diagrams
A method used to illustrate logic components or a sequence of events.
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