I am using ignition 8.0.6 and have a udt opc tag of document type and using derived tag to extract individual variables, the problem is that at random times i get an error Expression Eval on all variables of the OPC UDT, restarting the tag provider , or simply disabling and enabling the derived tag will solve the issue. Is it a bug or i am missing a configuration.
try surrounding it with
Has there been any development on this problem ?? our ignition (8.0.6) seems to have the same problem and is only cleared once the tag is restarted.