TiVCLComponent.SetOPCItemAutoConnect

TiVCLComponent

Used to set whether or not the OPC Item Auto-Connects for the specified OPC Item.

procedure
SetOPCItemAutoConnect (Index: Integer, Value: Boolean);

Description

Use the SetOPCItemAutoConnect to set whether or not an OPC connection is automatically created for a particular OPC Item specified by the Index parameter. When AutoConnect is TRUE, when the component is instantiated, a connection to the OPC server for this item is automatically made. When AutoConnect is FALSE, you must call OPCItemActivate to create a connection to the OPC Server.

AutoConnect causes a connection to be made to the OPC server anytime streaming is done with the component. If you use runtime property editors for our components and the end-user changes properties and clicks on OK or Apply, the component will re-stream in all properties and reconnect to the OPC Server if AutoConnect is set to TRUE.

If you need complete control over when the connections are made and disconnected between the Component and the OPC Server, set AutoConnect to FALSE and then use the OPCItemActivate and OPCItemDeactivate procedures.

Example

Delphi

iComponent.SetOPCItemAutoConnect(0, True); //1st OPC Item AutoConnect Setting

C++ Builder

iComponent->SetOPCItemAutoConnect(0, TRUE); //1st OPC Item AutoConnect Setting

Note: The Index value is 0 based.

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