Rockwell Automation Publication 1766-UM001O-EN-P - September 2021 297
Glossary
The following terms and abbreviations are used throughout this manual.
address A character string that uniquely identifies a memory location. For example, I:1/
0 is the memory address for the data located in the Input file location word1,
bit 0.
AIC+ Advanced Interface Converter A device that provides a communication link between various networked
devices. (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.
baud rate The speed of communication between devices. All devices must communicate
at the same baud rate on a network.
bit The smallest storage location in memory that contains either a 1 (ON) or a 0
(OFF).
block diagrams A schematic drawing.
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.
communication scan A part of the controller’s operating cycle. Communication with other devices,
such as software running on a personal computer, takes place.
controller A device, such as a programmable controller, used to monitor input devices
and control output devices.
controller overhead An internal portion of the operating cycle used for housekeeping and set-up
purposes.
control profile The means by which a controller determines which outputs turn on under
what conditions.
counter 1) An electro-mechanical relay-type device that counts the occurrence of some
event. May be pulses developed from operations such as switch closures or
interruptions of light beams.
2) In controllers, a software counter eliminates the need for hardware
counters. The software counter can be given a preset count value to count up or
down whenever the counted event occurs.
CPU (Central Processing Unit) The decision-making and data storage section of a programmable controller.
data table The part of processor memory that contains I/O values and files where data is
monitored, manipulated, and changed for control purposes.
DIN rail Manufactured according to Deutsche Industrie Normenausshus (DIN)
standards, a metal railing designed to ease installation and mounting of your
controller.
download Data is transferred from a programming or storage device to another device.
DTE (Data Terminal Equipment) Equipment that is attached to a network to send or receive data, or both.
embedded I/O Embedded I/O is the controller’s on-board I/O.
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