HEIDENHAIN ITNC 530 - PILOT SMART NC Manual page 213

Mid-program startup (block scan, FCL 2 function)
Use the mid-program startup function (block scan) to run a part program
from any desired line number. The TNC scans the program blocks up to
that line number and displays the contour (select the PROGRAM +
GRAPHICS screen layout).
If the start-up point lies on a machining step in which you have defined
two or more machining positions, you can select the desired start-up
point by entering a point index. The point index contains the position of
the point in the input form.
You can select the point index very conveniently if you have defined the
machining position in a point table. Then smarT.NC automatically shows
the defined machining pattern in a preview window in which you can
select a start-up point by soft key.
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