Rockwell Automation 1762-Lxxxx MicroLogix 1200 Programmable Controllers - Manual (Page 156)

Publication 1762-UM001G-EN-P - March 2011
Glossary 4
input device
A device, such as a push button or a switch, that supplies signals to the input
circuits of the controller.
inrush current
The temporary surge current produced when a device or circuit is initially
energized.
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.
instruction set
The set of general purpose instructions available with a given controller.
I/O (Inputs and Outputs)
Consists of input and output devices that provide and/or receive data from the
controller.
jump
Change in normal sequence of program execution, by executing an instruction
that alters the program counter (sometimes called a branch). In ladder
programs a JUMP (JMP) instruction causes execution to jump to a labeled
rung.
ladder logic
A program written in a format resembling a ladder-like diagram. The program
is used by a programmable controller to control devices.
least significant bit (LSB)
The digit (or bit) in a binary word (code) that carries the smallest value of
weight.
LED (Light Emitting Diode)
Used as status indicator for processor functions and inputs and outputs.
LIFO (Last-In-First-Out)
The order that data is entered into and retrieved from a file.