Rockwell Automation 9323-PA1E QUICK START GUIDE APS 6.0 - Manual (Page 74)

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
1/0.
APS (Advanced Programming Software): Software used to monitor and develop
SLC 500 ladder logic programs.
bit: Binary digit. The smallest unit of information in the binary numbering system.
Represented by the digits 0 and 1. The smallest unit of memory.
branch: A parallel logic path within a ladder logic rung.
chassis: A hardware assembly that houses devices such as I/O modules, adapter
modules, processor modules, and power supplies.
comment: Text included within 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 SLC CPUs operating cycle in which
communication takes place with other devices, such as APS on a personal computer.
controller: A unit, such as a programmable controller or relay panel, that controls
machine or process elements.
CPU (central processing unit): The decision-making and data storage section of a
programmable controller.
cross reference: A report listing addresses, instructions, and their rung numbers
where used.
data file: An area within a processor file that contains the status of inputs, outputs,
the processor, timers, counters, and so on.
data table report: A report documenting the contents of the data files.
DOS: The operating system used to operate a personal computer.
edit: To create or modify a ladder program.
expansion chassis: A 2-slot chassis used only with fixed controllers.