How to differentiat value of DataChange from Subscription

[xfeng5]

Hi Experts,

As I know OPC server will send the default value of modle to client, but I want to know is how I can thdifferentiat the value is default value from the Subscription.DataChanged event, like for int type the default value is 0, string is empty.

[Support Team]

Hi,

a client cannot differentiate between a default value and a "real world" value. The server should make sure that correct values are sent.
Do you use LinkModelToNode at server side? If yes, you have to set correct values before calling LinkModelToNode.

[xfeng5]

Thank a lot, I'll have a try.