Rockwell Automation 9323-PA1E QUICK START GUIDE APS 6.0 - Manual (Page 75)

Preface
APS Quick Start for New Users
G–2
false: The status of an instruction that does not provide a continuous logical path on
a ladder rung.
file: A collection of information organized into one group.
fixed controller: A controller with a power supply, CPU, and I/O integrated into a
single package.
function keys: Keys on a personal computer keyboard labeled F1, F2, F3, and so
on. The operation of each of these keys is defined by software and a key may have
a different function for each menu display.
hard disk: A disk storage device for storing relatively large amounts of data.
hardware: Mechanical, electrical, and electronic components and assemblies.
I/O (Inputs and Outputs): Consists of input and output devices that provide
and/or receive data from the programmable controller.
input device: A digital or analog device, such as a limit switch, push-button switch,
pressure sensor, or temperature sensor, that supplies input data through an input
circuit to a programmable controller.
input scan: A part of the SLCs operating cycle. Status of the input modules are
loaded into the Input data file.
instruction: A mnemonic and data address defining an operation to be performed
by the processor. A rung in a program consists of a set of input and output
instructions. The input instructions are evaluated by the controller as being true or
false. In turn, the controller sets the output instructions to true or false.
interface converter: An Allen-Bradley device, Catalog Number 1747-PIC, used to
establish communication between the personal computer and a SLC 500
programmable controller.
ladder logic: A program written in a format resembling a ladder-like diagram. The
program is used by a programmable controller to control devices.
mnemonic: A simple and easy to remember term that is used to represent a
complex or lengthy set of information.
modular controller: SLC 500 system consisting of a power supply, chassis, CPU,
and input and output modules.
module: An interchangeable plug-in device that may inserted into a chassis.
network: A series of stations (nodes) connected by some type of communication
medium. A network may be made up of a single link or multiple links.