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, 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.
backup data: Data downloaded 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, 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 be true or false.
branch: A parallel logic path within a rung of a ladder program.
channel: Refers to the analog signals available on the controller’s terminal block.
Each channel is configured for connection to a voltage or current source input
device, and has its own data and diagnostic status words.
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.
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