Siemens SIMATIC OpenPCS 7, Руководство по эксплуатации функций

Страница: 14 / 96

messages can also be acknowledged via this server. Filter mechanisms and subscriptions
ensure that only selected, changed data is transmitted.
OPC "H" A&E (Historical Alarms & Events server)
For read access to archived alarms and messages.
Thanks to an expansion of the OPC standard interface by Siemens, the OpenPCS 7 station
is also able to transfer historical alarms and messages from the archive to the subscribers at
production and enterprise management levels.
OLE-DB
The WinCC OLE DB provider allows standardized and direct access to the archive data in the
Microsoft SQL server database on the OS server.
This setup permits access to all OS archive data, along with the associated process values,
message texts, and user texts.
2.5 OLE DB interface
OLE DB
The WinCC OLE DB Provider allows access to the process value and message archives.
Compressed process value archives are made available uncompressed. OLE DB is used to
read the PCS 7 OS or archive server database remotely.
OLE DB is an open standard for fast access to different databases. The connection between
the OLE DB level and the database is established by a database provider.
The WinCC OLE DB provider, which is integrated in the OpenPCS 7 station, enables
transparent access to archived process data of the following PCS 7 stations:
● PCS 7OS server
● Central archive server
2.6 COM / DCOM components of OpenPCS 7
COM / DCOM components used by OpenPCS 7
● OPC client runs on the OpenPCS 7 station
If the OPC client and OPC server process run on one computer, the OPC client accesses the
local OPC server object using an "in-process server" component via LRPC and a stub object.
Basics
2.6 COM / DCOM components of OpenPCS 7
OpenPCS 7
14
Function Manual, 05/2012, A5E02780178-02