Allen-Bradley micrologix 1500, User Manual, Page: 133 / 149

1 Publication 1764-UM001A-US-P
Glossary
The following terms are used throughout this manual. Refer to the Allen-Bradley
Industrial Automation Glossary , Publication Number AG-7.1, for a complete guide
to Allen-Bradley technical terms.
DGGUHVV
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.
$,& $GYDQFHG ,QWHUIDFH &RQYHUWHU
A device that provides RS-232 isolation to an RS-485 Half-Duplex
communication link. (Catalog Number 1761-NET-AIC.)
DSSOLFDWLRQ
1) A machine or process monitored and controlled by a controller. 2) The use of
computer- or processor-based routines for specific purposes.
EDXG UDWH
The speed of communication between devices. Baud rate is typically displayed in
K baud . For example, 19.2K baud = 19,200 bits per second.
ELW
The smallest unit of memory used in discrete or binary logic, where the value 1
represents ON and 0 represents OFF.
EORFN GLDJUDPV
A method used to illustrate logic components or a sequence of events.
%RROHDQ RSHUDWRUV
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.
EUDQFK
A parallel logic path within a rung of a ladder program. Its primary use is to build
OR logic.
FRPPXQLFDWLRQ VFDQ
A part of the controller’s operating cycle. Communication with devices (such as
other controllers and operator interface devices) takes place during this period.
FRQWURO SURJUDP
User logic (the application) that defines the controller’s operation.
FRQWUROOHU
A device, such as a programmable controller, used to control output devices.
FRQWUROOHU RYHUKHDG
A portion of the operating cycle used for housekeeping purposes (memory checks,
tests, communications, etc.).
AB Spares