The way LastUpdateTime usually works for OPC Servers is that it is a global (not point specific) value that gets updated whenever something happens on the shopfloor and any OPC tag is modified. MI queries this Global TimeStamp on the server for its status and checks for that value has changed. Default status polling interval is 1min, therefore MI gives a warning when “last updated time” is not modified between checks. This should never happen on a system in production.  However if there is nothing happening on the shopfloor, then there is nothing to worry about which is why it is just a warning.

This is very common to see this error when using OPC simulators. The same goes for “real” OPC servers not connected to any ‘live’ PLCs.