I have a fear that the answer is going to be one of those ones where I sorta shrink down in my chair and mutter…“oh right”.
One aspect of the overall design of a particular project is I am using Ignition as a “settings” interface to a plc. One where a new/replacement PLC can be installed in the machine, the ladder logic loaded, then the PLC brought online with Ignition at which point the tags that contained specific machine level settings would NOT read, but rather only write themselves to the PLC, thus making the new PLC the same as the PLC that was in the machine before (sorta like recipe’s I guess?).
The settings would be things like “Pump 2 in Rotation”, “Pressure Setpoint”, “min/max RPM allowed”.
I guess after asking, my question really does sound like recipe management. I was hoping to see a “write only” option in the tag definition where it doesn’t really care what the PLC addresses value is, it just writes a replacement value if they don’t match.