Rockwell Automation 1766-Lxxxx MicroLogix 1400 Programmable Controllers User Manual - Manual (Page 392)

352 Rockwell Automation Publication 1766-UM001H-EN-P - May 2014
Glossary
high byte
Bits 8 to 15 of a word.
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.