Omron CV500 Installation Manual page 172

output signal
Output Terminal
overflow
overwrite
parity
parity check
PC
PC configuration
PC System
PCB
PCF
PC Setup
Peripheral Device
peripheral servicing
PID Unit
port
Power Supply Unit
present value
printed circuit board
Printer Interface Unit
160
Glossary
A signal being sent to an external device. Generally an output signal is said to
exist when, for example, a connection point goes from low to high voltage or from
a nonconductive to a conductive state.
An I/O Terminal that provides output points.
The state where the capacity of a data storage location has been exceeded.
Changing the content of a memory location so that the previous content is lost.
Adjustment of the number of ON bits in a word or other unit of data so that the
total is always an even number or always an odd number. Parity is generally
used to check the accuracy of data after being transmitted by confirming that the
number of ON bits is still even or still odd.
Checking parity to ensure that transmitted data has not been corrupted.
An acronym for Programmable Controller.
The arrangement and interconnections of the Units that are put together to form
a functional PC.
With building-block PCs, all of the Racks and independent Units connected di-
rectly to them up to, but not including the I/O devices. The boundaries of a PC
System are the PC and the program in its CPU at the upper end; and the I/O
Units, Special I/O Units, Optical I/O Units, Remote Terminals, etc., at the lower
end.
An acronym for printed circuit board.
An acronym for plastic-clad optical fiber cable.
A group of operating parameters set in the PC from a Programming Device to
control PC operation.
Devices connected to a PC System to aid in system operation. Peripheral de-
vices include printers, programming devices, external storage media, etc.
Processing signals to and from peripheral devices, including refreshing, com-
munications processing, interrupts, etc.
A Unit designed for PID control.
A connector on a PC or computer that serves as a connection to an external de-
vice.
A Unit that mounts to a Backplane in a Rack PC. It provides power at the voltage
required by the other Units on the Rack.
The current value registered in a device at any instant during its operation. Pres-
ent value is abbreviated as PV. The use of this term is generally restricted to tim-
ers and counters.
A board onto which electrical circuits are printed for mounting into a computer or
electrical device.
A Unit used to interface a printer so that ladder diagrams and other data can be
printed out.