HEIDENHAIN SW 548328-05 DIN Programming - Manual (Page 550)

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Roughing limit behind cutting limit
Example 2: The roughing limit (SU) is located behind the cutting limit,
inside (SBI).
Abbreviations
 SBI: Cutting limit, inside
 SU: Roughing limitation (SU = sbl + ULI)
 sbl: Basic length of roughing cut ("deepest" point of inside contour)
 ULI: Overhang length, inside (machining parameter 4)
 nbl: Usable tool length (tool parameter)