Glossary - Allen-Bradley MicroLogix 1400 Instruction Manual

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Glossary

The following terms are used 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 located 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 purposes.
ASCII
American Standard Code for Information Interchange. A standard for
defining codes for information exchange between equipment produced
by different manufacturers. The basis of character sets used in most
microcomputers; a string of 7 binary digits represents each character.
baud rate
The speed of communication between devices. Baud rate is typically
displayed in K baud. For example, 19.2K baud = 19,200 bits per second.
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.
Boolean operators
Logical operators such as AND, OR, NAND, NOR, NOT, and Exclusive-OR
that can be used singularly or in combination to form logic statements or
circuits. Can have an output response of T or F.
branch
A parallel logic path within a rung of a ladder program. Its primary use is
to build OR logic.
667 Publication 1766-RM001A-EN-P - October 2008