Rockwell Automation 1762-Lxxxx MicroLogix 1200 Programmable Controllers - Manual (Page 159)

Publication 1762-UM001G-EN-P - March 2011
Glossary 7
operating voltage
For inputs, the voltage range needed for the input to be in the On state. For
outputs, the allowable range of user-supplied voltage.
output device
A device, such as a pilot light or a motor starter coil, that is controlled by the
controller.
processor
A Central Processing Unit. (See CPU.)
processor file
The set of program and data files used by the controller to control output
devices. Only one processor file may be stored in the controller at a time.
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.