dear support,

I am connecting with a VB >NEt application to an OPC DA server and have following question

I am using function SubscribeMultipleItems to get a callback. I am setting RequestedUpdateRate on the associated EasyDAItemSubscriptionArguments parameters. However, I dont get a callback in the requested frequency. I guess this is because the data in the OPC server ( buffer or device ?? ) has not changed.
Is there a mechanism to get a regular callback through the ItemChanged event, even if the underlying data has not changed ?

thanks for your thoughts,

guido