Rockwell Automation 1772-LS_LSP,D17726.8.6 PROG/OPER MANUAL-MINI PLC-2/05 - Manual (Page 245)

Glossary
Appendix B
BĆ9
Image Table
An area in processor memory dedicated to I/O data. Ones and zeros (1 and 0)
represent on and off conditions, respectively. During every I/O scan, each input
controls a bit in the input image table; each output is controlled by a bit in the
output image table.
Input
Information transmitted from a peripheral device to the input module, and then
to the data table.
Input Devices
Devices such as limit switches, pressure switches, push buttons, analog and/or
digital devices, that supply data to a programmable controller.
Instruction
A command that causes a programmable controller to perform one specific
operation. The user enters a combination of instructions into memory to form a
unique application program.
Integer
Any positive or negative whole number or zero.
Intelligent I/O Module
Microprocessor-based modules that perform processing or sophisticated
closed-loop, application functions.
Intelligent Terminal
A terminal that has some internal processing capability for manipulating data.
Interface
The boundary (shared) between two systems.
I/O
Input/Output.
I/O Channel
A data transmission link between a processor scanner module and an I/O
adapter module.
I/O Chassis
See chassis.
I/O Module
A device that interfaces between the user devices and the processor.
I/O Rack
See rack.
I/O Scan Time
The time required for the processor to monitor inputs and control outputs.