Profibus GSD file Import - I/O setting - selection of conversions rule.
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If you are using the Wizard to define the datatype of the GSD file, select a DInt type with the two bytes. After, in your program, execute the function dint_to_real.
Other option is read both bytes in a variables "word" and convert to real with words_to_real(real, word1, word2, BigEndian)
I hope this could help you.