Object ExtOpcDa

Description:

An extension of the PmVar variable of the PmaData object for the connection to the OPC DA communication. The data item is a client connected to OPC server.

Properties and methods:

AccessPath	Access path to the variable in the OPC server
ExtId	Data extension identifier
Group	Returns the PmaOpcDaClientGroup object
ItemId	Text address/identifier of the variable in the OPC server.
RecalcD	Value of the D constant for recalculation
RecalcK	Value of the K constant for recalculation
RecalcQ	Value of the Q constant for recalculation
TimeStamp	Time stamp of the variable
Var	Returns the PmVar object

Configuration windows:

ExtOpcDa	Data extension configuration

Note:

This data extension registrates itself automatically into the PmaOpcDaClientGroup object after starting the application. Therefore it is not needed to create the requested item on the "PmaOpcDaClientGroup > Data" tab! If all items for the PmaOpcDaClientGroup object are of the "Data extension" type, then the "PmaOpcDaClientGroup > Data" tab may remain empty.

Format of saving the data extension in the form of string:
The content of complete of data extension (all configurators) can be saved in the form of single string. See Format of saving the data extension in the form of string.
Id={OpcDa;PmaObject;ItemId;AccessPath;K;Q;D}

- Id: see the "Data extension identifier" configurator

- PmaObject: see the "Target object (PmaOpcDaClientGroup)" configurator

- ItemId: see the "ItemID" configurator

- AccessPath: see the "AccessPath" configurator

- K;Q;D: see the "Value recalculation" configurator