Object ExtOpcDa

Description:

An extension of the PmVar variable of the PmaData object for 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	Timestamp 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 the application is launched. 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 a text string:
The content of complete of data extension (all configurators) can be saved in the form of single text string. See Format of saving the data extension in the form of a text 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