Rockwell Automation 1764-xxxx MICROLOGIX 1500 PROGRAMMABLE CONTROLLERS - Manual (Page 161)

Publication 1764-UM001B-EN-P - April 2002
Glossary 5
jump
Changes the normal sequence of program execution. In ladder
programs a JUMP (JMP) instruction causes execution to jump to a
specific rung in the user program.
ladder logic
A graphical programming format resembling a ladder-like diagram.
The ladder logic programing language is the most common
programmable controller language.
least significant bit (LSB)
The element (or bit) in a binary word 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 stored and retrieved from a file.
low byte
Bits 0 to 7 of a word.
logic
A general term for digital circuits or programmed instructions to
perform required decision making and computational functions.
Master Control Relay (MCR)
A hard-wired relay that can be de-energized by any series-connected
emergency stop switch.
mnemonic
A simple and easy to remember term that is used to represent a
complex or lengthy set of information.
Modbus™ RTU Slave
A serial communication protocol.