FED/VipWin interface
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1.3 Exchanging data with VipWin via OPC
1.3.1 Basic information on exchanging data with VipWin via OPC
OPC (OLE for Process Control) is a standardised software interface that provides access to process data.
You can establish a connection between VipWin and one or more Festo CoDeSys controllers via this
software interface.
Communication between an OPC server and an OPC client is established via OPC in combination with
Festo CoDeSys controllers and VipWin. The OPC server requests the process data for the controllers and
transfers it to the OPC client (VipWin with OPC client driver). An OPC server is included in the scope of
delivery of the CoDeSys provided by Festo as an executable program. The CoDeSys gateway server
(gateway) supports this OPC server. VipWin includes an OPC client driver that enables communication
with the OPC server. The following system structure is supported in combination with the Festo CoDeSys
controller and VipWin:
Fig.: System structure "OPC connection with VipWin"
VipWin (as an OPC client), the OPC server and the gateway server must be installed on the same PC. The
OPC server must be started before a connection can be established between the client and controller. The
controller variables are activated based on the symbol file generated using CoDeSys, which specifies
which variables are available in the controller. The OPC server requests the contents of the symbol file
from the gateway. In order that the gateway can provide the correct symbol files for the connected
controllers, the symbol files must be stored in the relevant controller.
After installing the OPC server, refer to the document OPC_20_how_to_use_d.pdf or
OPC_20_how_to_use_E.pdf in the directory "...\Program Files\Festo\CoDeSysOPC" for more information
on the OPC server included in the scope of delivery of CoDeSys provided by Festo.
Note
Remember that communication between the OPC client (VipWin) and OPC server is only
supported if both applications (OPC client and server) are running on the same PC.
Target settings "Download symbol file"
The "Download symbol file" option in the "General" tab under the target settings must be selected so that
the gateway can provide the symbol file.
1. Select the "Resources" tab in the "Object Organizer".
2. Double-click on "Target Settings" in the "Resources" tab. The "Target Settings" dialog box then opens.
3. Select the option "Download symbol file" in the "General" tab.
If a symbol file is generated when a project is compiled, this file is transferred to the controller during
the download process.
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