Cannot read some tags inside Rockwell AOI

I use first scan rungs where applicable. Habit, as older Logix versions didn't have default values either, and I try to create AOIs for the least common denominator.

Just to be crystal clear: I am a big fan of Add-on Instructions. I just work around this particular gotcha by moving "public" data into a separate UDT that is passed to the AOI as an in/out parameter.

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