Siemens SIMATIC PCS 7 OSx Manuel d'utilisateur télécharger pdf (Page 6)

Terms defined in glossary are in bold type.

Glossary-4

See OSx Database, Remote Database.

Parameter in the Event Preferences dialog box that determines how long

a value remains unchanged in the database before a subsequent OSx read

request causes an explicit read of the value from the control node.

A transaction that moves data from one database to another. Used with

RDT.

Data transfer components may consist of the following files: data transfer

specification files, data transfer programs,anadministration

program, related directories, and intermediate source files. Used with RDT.

A group of one or more data transfers that are triggered by the same event

or condition and that generate a transaction. Used with RDT.

An executable program that consists of one or more data transfer groups

and their schedules. This process/program also contains machine

definitions. Data transfer programs are created when you compile and

install data transfer specification files. SIMATIC PCS 7 OSx automatically

runs these programs to transfer data between databases. Used with RDT.

These files contains the data transfer instructions that you specify to move

data from one database to another. Used with RDT.

Dynamic Data Exchange (also see hot link)isameansofexchangingdata

between processes in real time. Used with SIMATIC PCS 7 OSx @aGlance.

Database Definition Language. OSx utility program used to modify tables,

and to define new database attributes and domains.

Dynamic Data Object. Graphic objects that display data in a variety of

ways. They can function as Bars, Meters, and Gauges that use the latest

data value received to set the current position of an indicator on a scale.

Trend DDOs provide g raph functions by plotting a range of values. Button,

Menu, and Select List DDOs act as operator interface components.

Database Data Update. OSx utility program used to modify values in the

database.

Range by which the current value of a scanned analog attribute can vary

before the system stores a new value in the database. Tag types that have

deadbands are CALC, AO, AI, LOOP, and TMR.

Requests for data from a control node when OSx is in the Operate state,

on an as-needed basis.

Database

Data Staleness

Period

Data Transfer

Components

Data Transfer

Group

Data Transfer

Process/Program

Data Transfer

Specification Files

DDE

DDL Utility

DDO

DDU

Deadband

Demand Scan

1 2 3 4 5 6 7 8 9 10 11 ... 16 17

Commentaires sur ces manuels

Pas de commentaire

Siemens SIMATIC PCS 7 OSx Manuel d'utilisateur Page 6

Commentaires sur ces manuels

Produits connexes et manuels pour Logiciel Siemens SIMATIC PCS 7 OSx