TiPlotChannelCustom.OPCAutoConnect

TiPlotChannelCustom

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

property
OPCAutoConnect : Boolean;

Description

Use the OPCAutoConnect property to set whether or not an OPC connection is automatically created for this channel. When AutoConnect is TRUE, when the component is instantiated, a connection to the OPC server for this channel. When AutoConnect is FALSE, you must call OPCActivate 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.

Data Update

A data point is added to the chart whenever data is received from an OPC Item specified b the OPCItemName property. The Y-Value is obtained from the incoming OPC Item data and the X-Value is obtained depending on the value specified for the OPCXValueSource property for the TiPlot component, and is specified by the OPC Server's TimeStamp for the TiXYPlot component.

Example

Delphi

iComponent.Channel[0].OPCAutoConnect := True;

C++ Builder

iComponent->Channel[0]->OPCAutoConnect = TRUE;

Note: CLX Components do not support OPC Features.

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