Glossary
G–5
program file: The area within a processor file that contains the ladder logic
program.
program mode: When the controller is not executing the processor file and all
outputs are de-energized.
program scan: A part of the controller’
s operating cycle. During the scan the
ladder program is executed and the Output data file is updated based on the program
and the Input data file.
programming device: Executable programming package used to develop ladder
diagrams.
protocol: The packaging of information that is transmitted across a network.
read: To acquire data from a storage place. For example, the processor READs
information from the input data file to solve the ladder program.
relay:
An electrically operated device that mechanically switches electrical circuits.
relay logic: A representation of the program or other logic in a form normally used
for relays.
REM Run mode:
REMote run mode during which the processor scans or executes
the ladder program, monitors input devices, ener
gizes output devices, and acts on
enabled I/O forces.
restore: To download (transfer) a program from a personal computer to a
controller.
reserved bit: A status file location that the user should not read or write to.
retentive data: Information associated with data files (timers, counters, inputs, and
outputs) in a program that is preserved through power cycles. Program files 2–15
are not effected by retentive data.
RS-232: An EIA standard that specifies electrical, mechanical, and functional
characteristics for serial binary communication circuits. A single-ended serial
communication interface.
run mode: When the processor file in the controller is being executed, inputs are
read, the program is scanned, and outputs are energized and de-energized.
rung: Ladder logic is comprised of a set of rungs. A rung contains input and
output instructions. During Run mode, the inputs on a rung are evaluated to be true
or false. If a path of true logic exists, the outputs are made true. If all paths are
false, the outputs are made false.
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