I am trying to edit a UDT for a "Date" type ID which would be considered a Designator for Ignition Modbus Addressing, BUT, which one? It holds a date and time in 6 modubs registers. I feel I have tried every combination under the Data Type UDT derfinition editor. Thoughts on which Data Type under a UDT that would read a holding register with 6 registers as a Date?
There isn't one. Bring in all 6 registers in as separate tags and make an expression tag or script that combines them together in whatever format they invented and presumably documented.
Is there a way to create a tag for Transacitn Groups to be logged in SQL?
Any Ignition tag can be added to a Transaction Group via a Tag Reference Item: Item Types | Ignition User Manual
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If you are using OPC Read mode to ensure data is captured together after a trigger, use read-only OPC items in the transaction group to pull in those registers without DB columns, then add an expression item for the processed datetime value (with DB column).