I have UDP tag coming in from a scanner. In some cases, the data being transmitted may be exactly the same. I am processing the information on a tag change script. But if a transmit occurs with the same exact data, the script will not fire. Whats the best way to make this work. Can I write a blank string to the tag every time the tag change script fires? I’ve tried
system.opc.writeValue(“IgnitionOPCUA”, “VB0/4000/Field0”, " ")
but it doesn’t seem to be writing to the tag.
Those field tags are read-only.
There’s a bigger issue at hand here, which is that the OPC-UA subscriptions don’t send data change notifications unless a value change has occurred. Currently, there are no settings available to change that.
Notifications are sent on value or quality changes, not timestamp.