OPC UA Client continues reading


I have OPC UA Client where I read two items as shown in the picture.

I have set the inject timer to 10ms interval, each 10ms, the node fetches the updated data. This is an issue for me as I will have continues request of data each 10ms, and not only when data has changed. Is there a way of implementing call-back method. By the way I am using a PLC as OPC UA server host.