3G5A2-RPT01-PE datasheet(176/182 Pages) OMRON

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Glossary

164

timer

A location in memory accessed through a TC bit and used to time down from the

timer’s set value. Timers are turned ON and reset according to their execution

conditions.

TR Area

A data area used to store execution conditions so that they can be reloaded later

for use with other instructions.

TR bit

A bit in the TR Area.

transfer

The process of moving data from one location to another within the PC, or be-

tween the PC and external devices. When data is transferred, generally a copy

of the data is sent to the destination, i.e., the content of the source of the transfer

is not changed.

transmission distance

The distance that a signal can be transmitted.

UM area

The memory area used to hold the active program, i.e., the program that is being

currently executed.

Unit

In OMRON PC terminology, the word Unit is capitalized to indicate any product

sold for a PC System. Though most of the names of these products end with the

word Unit, not all do, e.g., a Remote Terminal is referred to in a collective sense

as a Unit. Context generally makes any limitations of this word clear.

unit address

A number used to control network communications. Unit addresses are com-

puted for Units in various ways, e.g., 10 hex is added to the unit number to deter-

mine the unit address for a CPU Bus Unit.

unit number

A number assigned to some Link Units, Special I/O Units, and CPU Bus Units to

facilitate identification when assigning words or other operating parameters.

uploading

The process of transferring a program or data from a lower-level or slave com-

puter to a higher-level or host computer. If a Programming Devices is involved,

the Programming Device is considered the host computer.

watchdog timer

A timer within the system that ensures that the scan time stays within specified

limits. When limits are reached, either warnings are given or PC operation is

stopped depending on the particular limit that is reached.

WDT

See

watchdog timer.

wire communications

A communications method in which signals are sent over wire cable. Although

noise resistance and transmission distance can sometimes be a problem with

wire communications, they are still the cheapest and the most common, and per-

fectly adequate for many applications.

word

A unit of data storage in memory that consists of 16 bits. All data areas consists

of words. Some data areas can be accessed only by words; others, by either

words or bits.

word address

The location in memory where a word of data is stored. A word address must

specify (sometimes by default) the data area and the number of the word that is

being addressed.

word allocation

The process of assigning I/O words and bits in memory to I/O Units and termi-

nals in a PC System to create an I/O Table.

work area

A part of memory containing work words/bits.

3G5A2-RPT01-PE Datasheet(PDF) 176 Page - Omron Electronics LLC

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