Welcome!
Biggest thing to start with is Inductive University… that will get you exposed to SOOOO much.
Next… read up on Ignition UDTs. And then read up on Rockwell AOI vs UDTs: Cannot read some tags inside Rockwell AOI - #5 by Kevin.Herron
It is trivial to create an Ignition UDT that has members that are boolean that address a specific bit in a DINT in the PLC. You don’t need to read the DINT and then go from there.
Example:
This is an OPC item path for a BOOL tag in a UDT that is addressing a bit on a DINT in a Rockwell PLC.
Once you get your UDTs setup, then you can map thing automagically into the UDT to generate alarms etc…