How can I, if possible, read back and present data (formerly logged to DB) from SQL or Oracle DB in the 800xA HMI?
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It is possible to log PDL data using 800xA system IM facilities.
Also, 800xA contain tools to access data related to PDL - desktop trends and data direct. And, of course, these data can be displayed on HMI.
I'm not sure you can log PDL in MS SQL and I've never seen 2 different database management systems running on the same server simultaneously. At least I haven't seen such solutions... but I'm not stand for that. In fact, it is possible.