Preface
MicroLogix 1000 Programmable Controllers User Manual
G–2
control profile: The means by which a controller determines which outputs turn on
under what conditions.
counter: 1) An electro-mechanical relay-type device that counts the occurrence of
some event. May be pulses developed from operations such as switch closures,
interruptions of light beams, or other discrete events.
2) In controllers a software counter eliminates the need for hardware counters. The
software counter can be given a preset count value to count up or down whenever
the counted event occurs.
CPU (Central Processing Unit): The decision-making and data storage section of
a programmable controller.
data table: The part of the processor memory that contains I/O values and files
where data is monitored, manipulated, and changed for control purposes.
DIN rail: Manufactured according to Deutsche Industrie Normenausshus (DIN)
standards, a metal railing designed to ease installation and mounting of your
controller.
download: Data is transferred from a programming or storage device to another
device.
DTE (Data Terminal Equipment): Equipment that is attached to a network to
send or receive data, or both.
EMI: Electromagnetic interference.
encoder: 1) A rotary device that transmits position information. 2) A device that
transmits a fixed number of pulses for each revolution.
false: The status of an instruction that does not provide a continuous logical path on
a ladder rung.
FIFO (First-In–First-Out): The order that data is entered into and retrieved from
a file.
file: A collection of information organized into one group.
full-duplex: A bidirectional mode of communication where data may be
transmitted and received simultaneously (contrast with half-duplex).
half-duplex: A communication link in which data transmission is limited to one
direction at a time.
hard disk: A storage area in a personal computer that may be used to save
processor files and reports for future use.
high byte: Bits 8–15 of a word.
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