3G5A2-RPT01-PE datasheet(172/182 Pages) OMRON

172 / 182 page

Glossary

160

output signal

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.

Output Terminal

An I/O Terminal that provides output points.

overflow

The state where the capacity of a data storage location has been exceeded.

overwrite

Changing the content of a memory location so that the previous content is lost.

parity

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.

parity check

Checking parity to ensure that transmitted data has not been corrupted.

An acronym for Programmable Controller.

PC configuration

The arrangement and interconnections of the Units that are put together to form

a functional PC.

PC System

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.

PCB

An acronym for printed circuit board.

PCF

An acronym for plastic-clad optical fiber cable.

PC Setup

A group of operating parameters set in the PC from a Programming Device to

control PC operation.

Peripheral Device

Devices connected to a PC System to aid in system operation. Peripheral de-

vices include printers, programming devices, external storage media, etc.

peripheral servicing

Processing signals to and from peripheral devices, including refreshing, com-

munications processing, interrupts, etc.

PID Unit

A Unit designed for PID control.

port

A connector on a PC or computer that serves as a connection to an external de-

vice.

Power Supply Unit

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.

present value

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.

printed circuit board

A board onto which electrical circuits are printed for mounting into a computer or

electrical device.

Printer Interface Unit

A Unit used to interface a printer so that ladder diagrams and other data can be

printed out.

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