3G5A2-RPT01-PE datasheet(163/182 Pages) OMRON

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151

Glossary

address

A number used to identify the location of data or programming instructions in

memory or to identify the location of a network or a unit in a network.

advanced instruction

An instruction input with a function code that handles data processing opera-

tions within ladder diagrams, as opposed to a basic instruction, which makes up

the fundamental portion of a ladder diagram.

AGF

All-glass optical fiber cable; also known as crystal optical fiber cable.

allocation

The process by which the PC assigns certain bits or words in memory for various

functions. This includes pairing I/O bits to I/O points on Units.

analog

Something that represents or can process a continuous range of values as op-

posed to values that can be represented in distinct increments. Something that

represents or can process values represented in distinct increments is called

digital.

Analog I/O Unit

I/O Units that convert I/O between analog and digital values. An Analog Input

Unit converts an analog input to a digital value for processing by the PC. An Ana-

log Output Unit converts a digital value to an analog output.

AND

A logic operation whereby the result is true if and only if both premises are true.

In ladder-diagram programming the premises are usually ON/OFF states of bits

or the logical combination of such states called execution conditions.

APF

An acronym for all-plastic optical fiber cable.

area

See

data area and memory area.

area prefix

A one or two letter prefix used to identify a memory area in the PC. All memory

areas except the CIO area require prefixes to identify addresses in them.

ASCII

Short for American Standard Code for Information Interchange. ASCII is used to

code characters for output to printers and other external devices.

asynchronous execution

Execution of programs and servicing operations in which program execution

and servicing are not synchronized with each other.

Auxiliary Area

A PC data area allocated to flags and control bits.

auxiliary bit

A bit in the Auxiliary Area.

Backplane

A base to which Units are mounted to form a Rack. Backplanes provide a series

of connectors for these Units along with buses to connect them to the CPU and

other Units and wiring to connect them to the Power Supply Unit. Backplanes

also provide connectors used to connect them to other Backplanes.

back-up

A copy made of existing data to ensure that the data will not be lost even if the

original data is corrupted or erased.

BASIC

A common programming language. BASIC Units are programmed in BASIC.

basic instruction

A fundamental instruction used in a ladder diagram. See

advanced instruction.

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