Application 3:
This configuration can also be used if Project B is a third-party product that provides an OPC
server and not a PCS 7 project. The requirement is that both projects support the same OPC
standard.
Note
The OPC channel can only be used for OPC DA.
5.6 Access to a CAS via OpenPCS 7
Access to a central archive server (CAS) via OpenPCS 7
In a PCS 7project, the data archived on the PCS 7 OS server can be transferred to a central
archive server. You access the data on the central archive server via the OpenPCS 7 station,
OPC HDA and OPC "H" A&E.
The OpenPCS 7 station hides the communication between the OpenPCS 7 station, PCS 7 OS
server and the central archive server. The OPC client always directs its query to the OpenPCS
7 station.
The access mechanism with OPC "H" A&E is as follows:
The OPC client sends the query to the OpenPCS 7 station. The OpenPCS 7 station sends the
query to the PCS 7 OS server. The OS server sends the query to the CAS if the time period
in question is no longer available on the OS server and then forwards the data to the OpenPCS
7 station.
If, while reading messages on an operator station, you wish to use OPC Alarms & Events to
gain additional access to messages for this OS that are stored in an archive on a CAS, then
you will need to carry out the following configuration steps:
1. Assign the CAS to the OS server as well in the configuration in the SIMATIC manager.
(Right-click on the OS project, choose "Assign server", select "CAS".)
2. For all alarm controls of the OS server, you must deactivate the "All servers" check box
and select only those servers (with the exception of the CAS) whose messages are to be
displayed.
Note
When a time range is specified in an alarm control, the messages archived in the CAS
are automatically included - even if the CAS was not one of the servers selected.
The access mechanism with OPC HDA is as follows:
The OPC client sends its query to the OpenPCS 7 station. The OpenPCS 7 station accesses
the CAS directly using OPC HDA. The CAS package must be assigned to the OpenPCS 7
station.
System configurations
5.6 Access to a CAS via OpenPCS 7
OpenPCS 7
40 Function Manual, 05/2012, A5E02780178-02
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