IDataSource interface - WriteTagVQT et al

[TnTn]

Hello,

Looking for some resources on how to use the IDataSource interface, eg WriteTagVqtElement etc. via the Geo SCADA API.

There seems to be nothing in the way of examples on how to use any of the methods 😕

Thanks

[sbeadle · Accepted solution]

Writing to the CurrentValue field of a point using the WriteTagVqt method (or other data access interfaces) will either issue a control (for output and internal points) or apply a master-station override (for input points), both of which discard the time and quality in the VQT.

This method is not appropriate for backfilling historic data.

The WriteTagVqt method can, for example, be used set a variable database object which stores a value, quality and time.

An alternative would be to use SetProperties(). This allows you to set multiple properties on a object in one call which is more efficient and also very similar to the original code.

Something like:

ClearScada.Client.Simple.Connection SimpleConnection;
ClearScada.Client.Advanced.IServer AdvConnection;
// Connect to database
ClearScada.Client.ServerNode node = new ClearScada.Client.ServerNode("127.0.0.1", 5481);
SimpleConnection = new ClearScada.Client.Simple.Connection("Utility");
SimpleConnection.Connect(node);
AdvConnection = SimpleConnection.Server;
// Logon and get object ID for point etc.
string[] PropertyNames = { "PresetQuality", "PresetTimestamp", "CurrentValue" };
object[] PropertyValues = { 80, 45458.370277778, 55.5 };
AdvConnection.SetProperties( 2, PropertyNames, PropertyValues);