Beckhoff TF6120, Manual

Page: 27 / 76

Configuration
TF6120 27 Version: 1.1
4 Configuration
4.1 OPC DA Server
4.1.1 OPC DA Server
The TwinCAT 3 Function TF6120 provides an OPC-Server, which provides different features. The following
table gives an overview about all features and links to the corresponding chapter in this documentation.
Feature Description
General [
}
27]
Provides documentation about general configuration
settings.
Data Access (DA) [ } 33]
Data Access provides the functionality to read/write
process values from TwinCAT PLC or TwinCAT I/O.
Conversion [ } 41]
Converting process values "on-the-fly"
Simulation [
}
44]
Simulating process values without actually
connecting to the underlying device.
Item properties [
}
47]
Definition of Item Properties.
Data exchange via network [
}
48]
Communicating with OPC via the network.
4.1.2 General
4.1.2.1 General configuration
The following tables gives an overview about all articles in this documentation, which describe general
configuration parameters of the OPC-Server.
Feature Description
Optimizations [ } 27]
Describes some basic concepts about how to
optimize the OPC-Server, e.g. by reducing its
namespace.
OPC-Server as EXE oder Inproc (DLL) [
}
28]
Describes different execution modes of the OPC-
Server.
Automatic Cache Update [
}
29]
Describes the feature of an automatic cache update
after each write operation.
Description of the XML Configuration [
}
31]
Contains a description of all parameters in the OPC-
Server configuration file.
4.1.2.2 Optimizations
In case of trouble with OPC-Server performance please check following steps :
1. Minimize OPC-Namespace in TwinCAT-OPC-Server :
• OPC-Server should provide required variables in his namespace which are requested by an opc-client.
It makes no sense to provide 700.000 PLC variables in the OPC-namespace but the opc-client just
exchange values from 10.000 variables. The size of OPC-namespace will cause a longer opc-server-
startup-time and will cause a high memory consumption .
Option 1 :
Export just part of PLC variables required for OPC.