Commands And Events

The OPC module has the following Commands and Events:

Events

Name	Description	Event Type
ExternalItems	Timer event for handling of external items. By default, the command 'HandleExternalItems' is connected to this event, but that can be modified. The timer resolution is specified by the 'ExchangeRate' property.	Timer
ServerConnected	The OPC server if connected.	Normal
ServerDataChange	The OPC server has sent a subscription based data change notification.	Normal
ServerFirstTimeDataChanged	The OPC server has sent a subscription based data change notification first time after reconnect.	Normal
ServerShutdown	The OPC server has sent a shutdown notification.	Normal

Name	Description	Command Type
HandleExternalItems	Command for reading external items. When fired, the module will read all its external items, and update/notify the ones that has changed.	Synchronous
ResetExternalItems	Resets the external item manager, by forcing a full refresh of all external items when the 'HandleExternalItems' is fired next time.	Synchronous
Reconnect	Reconnects to the OPC server.	Asynchronous
Reset	Resets the OPC items in the client by performing a synchronous read from server.	Synchronous
UpdateItemTimestamp	Command used for updating the value of the item specified in the 'TimeReferenceItem' property, when configured.	Synchronous