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4 Data Management User Manu al Line Computer UNIX 4.1 Introduction Software Version 501.xx 01/99 Issue 4 - 4

User Manual Line Computer UNIX 4 Data Management

Software Version 501.xx 01/99 Issue 4.1 Introduction

4 - 3

4.1.2.1 Modules of the DNC System

- Data Manager User Interface

The user interface of the Data Manager (see section 4.3) enables the manipulation of files and

directoriies.

- Print and Update Server User Interface

The user interface of the Print and Update Server (see section 4.4) enables the devices which are

physically available in the LC system, such as printers, diskette and tape drives, to be logged on to

(activated) or logged off (deactivated) the user system and to prepare data carriers for data saving

procededures.

- Print Server

Upon the request by a user (e.g. the Data Manager), the Print Server outputs files, directories and

directory structures on the printer.

- Update Server

Upon the request by a user (e.g. the Data Manager) the Update Server enables files and directories

to be copied to external data carriers such as diskettes and streaming tapes.

- Master Data Storage

The Master Data Storage manages data, attributes and user-specific information. Upon request it

makes available stored data, or receives new data.

4 Data Management User Manual Line Computer UNIX

4.1 Introduction Software Version 501.xx 01/99 Issue

4 - 4

User Manual Line Computer UNIX 4 Data Management

Software Version 501.xx 01/99 Issue 4.2 Data Storage

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4.2 Data Storage

4.2.1 General Description

The computer system of a production line may consist of several line computers and one central computer.

Every individual line computer has its own

local data storage

. The central computer is used for

central data

storage

. All line computers within the computer system can access this central data storage, provided, however,

that

- the network connections (NFS) from the local computers to the central computer already exist,

- the software versions use the exactly identical data format,

- the file and directory structures of the local computers correspond to that of the central computer.

This can be accomplished, for example, by copying the existing line computer data storage to the

central computer.

NOTE

When working with the central data storage, any changes made to the data are only

rewritten to the

central

data storage

, i.e. the

local data storage

is not updated.

However, in order to keep the local data storage up-to-date, it is therefore necessary that these data be regu-

larly (e.g. at the end of every working day) overwritten with the data from the central data storage. In the event

of a power failure, work can thus be continued using the updated data contained in local data storage.

Inside the Line selection button (see chapt. 3, Fig. 3.1.1), on the desktop, the currently active data storage mode

is indicated in front of the designation of the current line:

e.g. local: /Anlagen/xxx.ak) for local data storage

central: /Anlagen/xxx.ak) for central data storage.