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It is not possible, you can just read one variable.
you can check for maintenance purpose all the parameters using DTM.
using S900 is posible to gain access to more than one variable
For HART AI we can use standard SignalInRealM FB or is there some other FB? Also DTM is provided with standard ABB installation package or we need to purchase it separately?
DTM is vendor specific, normally you can download from page of instrument manufacturer