One of the things I noticed while upgrading from FactoryPMI to Ignition is the change in behavior of the Level Indicators. Namely, if the value is < 0 or > capacity, it displays the “limit exceeded” overlay.
I find it’s pretty common to have level transducers that are not perfectly calibrated, so often a tank or whatever will be empty and the level reading is something like -2%. That, to me, seems to be a much less severe case than a communications error.
I think it would be nice to have a check box or whatever that made that particular overlay optional. I realize this can be fixed by just coercing the value with an expression, but that’s a bit of a nuisance.