Siemens ST PCS 7 manual OS archiving, Process values

© Siemens AG 2007

Operator system

OS archiving

Introduction

■Overview

OS server:

short-term archiving (cyclic)

The StoragePlus computer and the central archive server are stations on the terminal bus, and are not connected to the plant bus. When using a SIMATIC PCS 7 Industrial Workstation (BCE version) as the hardware platform, the Ethernet interface (Ethernet RJ45 port) already onboard can be used for connect- ing to the terminal bus.

Process values

Slow archiving cycle > 1 min

e.g.

2 weeks

Fast archiving cycle

30byte/

value

Automatic saving e.g. daily

Central archive server: long-term archiving

Through a redundant design of the central archive server, the availability of long-term data is increased, and these can also be accessed by the OS clients or the OpenPCS 7 station. SIMATIC BATCH does not yet swap out the batch data to the two central archive servers. However, following automatic matching of the archives, the batch data are available on both central archive servers following swapping out.

■Function

5

≤ 1 min

e.g.

7 days

Messages/events

Alarm archive

e.g.

2 months

Batch server

Batch data

On user request, transfer following end of a batch

Max.

30byte/

value

172byte/

event

XML files

Microsoft SQL server

Saving on hard disk

e.g. for 6 months

Automatic saving (applicative) e.g. weekly

Backup archiving on DVD

Features of the archive variables and licensing of short-term and long-term archiving

• There is only one type of archive variable for OS short-term ar- chiving and CAS long-term archiving. SIMATIC PCS 7 Archive and SIMATIC PCS 7 Archive PowerPacks can be used univer- sally - both for the operator system and for the CAS.

• The "SIMATIC PCS 7 Archives" are Count Relevant Licenses, i.e. the archive variables of several licenses are cumulative. Starting with the smallest cumulative number of

1500 variables, any combinations are possible with consider- ation of the expansion limits of 10000 variables for OS short- term archiving and 120000 variables for CAS long-term ar- chiving, e.g. 2 x 1500 or 1 x 1500 with 1 x 5000 variables.

• The number of archive variables can also be increased using "SIMATIC PCS 7 Archive PowerPacks". Starting with

1500 variables, increasing is possible in steps through 5000, 10000, 30000 and 80000 variables up to 120000 variables.

• If a CAS is not used, the licenses of the SIMATIC PCS 7 Ar- chive are installed on the OS single stations and OS servers of the system. Otherwise the installation is only on the CAS.

Overview of short-term and long-term archiving

The operator system already includes a high-performance ar- chiving system based on Microsoft SQL Server with cyclic ar- chives for short-term saving of process values (typically 1 to

4 weeks) and messages/events (typically 2 months). Data from the short-term archive as well as OS reports and batch data from SIMATIC BATCH can be exported time-controlled or event-con- trolled for permanent archiving in a long-term archive.

■Design

Two alternatives with different features are available for the OS long-term archiving:

•StoragePlus:

More economical version for the lower performance range; for the archiving of about 1600 values/s from as many as four sin- gle stations, servers or pairs of servers

•Central archive server (CAS), for single or redundant configu- ration:

High-performance version for archiving about 10000 values/s from as many as 11 servers or pairs of servers

During long-term archiving with StoragePlus, the archived data can be visualized by means of the StoragePlus viewer. Process values and messages exported to the central archive server can also be accessed from an OS client.

The data managed in StoragePlus and in the central archive server can be saved on commercially available storage media (e.g. DVD). This requires additional hardware and software which support the respectively used operating system, e.g.

a DVD writer with appropriate writer software.

OS single stations and OS servers then "book" their archive variables from the CAS’s stock of variables. It is therefore un- necessary to carry out the complex installation of archive vari- able licenses on all OS single stations and OS servers in the system.

• Operator systems (OS single stations and OS servers) are assigned 512 archive variables each by the OS software, the CAS is immediately provided with 1500 archive variables by the central archive server basic package. If the short-term ar- chiving of the operator systems is combined with the CAS long-term archiving, the 512 archive variables of the OS single stations and OS servers are not cumulated with the

1500 archive variables of the CAS. The 1500 archive variables of the CAS are then available universally for short-term and long-term archiving.

• In the case of redundant systems, two archives must be con- figured with the corresponding number of archive variables.

Siemens ST PCS 7 · November 2007

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