Motorola DH6200 Specifications download pdf (Page 39)

2-27Master Glossary of Terms and Symbols

TR4.0:PROVOXRevision A — April 1997

data highway

A data communications network for a

limited area that functions as a logical

highway token bus. In a PROVOXr

Highway II communications system, there

are three types of highways: Network

Highway II, Bridge Highway II, and Local

Highway II.

Data Historian (DH)

APROVOXr software product that

collects and manipulates large amounts

of process operating data. DH produces

graphic trend plots and performs

statistical quality-control functions for

realtime and archived data. DH layers on

CHIP software.

data link

A unique building block within the

Documentation Toolkit software that sets

up database fields within an AutoCAD

drawing.

data link layer

A layer of the HART protocol that

specifies the message frame format

(Layer 2 of the Open Systems

Interconnection [OSI] model).

data processing (DP) printing style

Printer fonts containing fewer dots than

letter-quality fonts, to be printed quickly

by the print head as it moves

bidirectionally.

data record analog output (REC AO)

A multiplexer point type that copies a

value from an analog input point in the

multiplexer, then outputs the value to a

field device. A common use for the REC

AO point type is for strip-chart recording.

data seek

An event in a G2 system where a rule,

procedure, table, or some other facility

requires a value of a variable whose

validity interval has expired. G2 will

attempt to revalidate the sensor by

retrieving a current value.

datasheet

A paper form which records all of the

pertinent information about a device. This

sheet may consist of one or more pages.

The sheet can be site-specific or

standardized. A standardized set of data

sheets are the ISA Forms.

data type

Determines the rules that entries for

specific columns must follow.

data update rate

Digital communications on the HART link

occurs at 1200 baud, which means the

digitally communicated variables are

updated from twice a second to once

every four seconds, depending upon the

number of channels and variables

configured.

DAT files

In the Graphics Toolkit software,

definition files that several of the utilities

use. Definition files (also known as DAT

files since the file extension is DAT)

consist of a list of file names separated

by display names.

dB

Acronym: Decibel

DBI

Acronym: Database Index

DBMS

Acronym: database management system

dBmV

Acronym: Decibel millivolt

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