Rockwell Automation 1772-LV Mini-PLC - 2/15 Programmable Controller (Series B) Programming and Operations - Manual (Page 205)

Glossary
Appendix B
BĆ12
Output
Information transferred from PC image table words through output modules to
control output devices.
Output Devices
Devices such as solenoids, motor starters, etc., that receive data from the
programmable controller.
Parity
A method of testing the accuracy of binary numbers used in recorded,
transmitted, or received data.
Parity Bit
An additional bit added to a binary word to make the sum of the number of “1s”
in a word always even or odd.
Parity Check
A check that tests whether the number of “1s” in an array of binary digits is odd
or even.
PC
Abbreviation for programmable controller.
Peripheral Equipment
Units which may communicate with the programmable controller, but are not
apart of the progammable controller; e.g., cassette recorder, tape reader,
terminal or computer.
Power Supply
In general a device which converts AC line voltage to one or more DC voltages.
1) A PC power supply provides only the DC voltages required by the electronic
circuits internal to the PC. 2) A separate power supply, installed by the user, to
provide any DC voltages required by the application input and output devices.
Process
1) Continuous and regular production executed in a definite uninterrupted
manner. 2) A PC application which primarily requires data comparison and
manipulation. The PC monitors the input parameters in order to vary the output
values. (As generally contrasted with a machine, a process does not cause
mechanical motion.)
Processor
A unit in the programmable controller which scans all the inputs and outputs in
a predeteremined order. The Processor monitors the status of the inputs and
outputs in response to the user programmed instructions in memory, and it
energizes or de-energizes outputs as result of the logical comparisons made
through these instructions.