Rockwell Automation 1761-HHP-B30 MicroLogix 1000 with Hand-Held Programmer (HHP) - Manual (Page 505)

Glossary
G–1
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.
address: A character string that uniquely identifies a memory location. For
example, I1/0 is the memory address for the data located in the Input file
location word1, bit 0.
application: 1) A machine or process monitored and controlled by a
controller. 2) The use of computer– or processor–based routines for specific
purposes.
backup data: Data saved to the controller with the program.
baud rate: The speed of communication between devices on a network. All
devices must communicate at the same baud rate.
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, NEG, NOT, and
XOR that can be used singularly or in combination to form logic statements
or circuits. Can have an output response be true or false.
branch: A parallel logic path within a rung of a ladder program.
comment: Text included with a program to explain what the program is
doing. Comments do not affect the operation of the program in any way.
communication scan: A part of the controller’s operating cycle.
Communication with other devices, such as programming software 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 setup purposes.
control profile: The means by which a controller determines which outputs
turn on under what conditions.