HEIDENHAIN iTNC 530 (340 49x-03) - Manual (Page 546)

546 9 Programming: Special Functions
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Application example
The contour CONT1.H is to be milled in several infeeds. The TNC
generates the forward file CONT1_fwd.h and the backward file
CONT1_rev.h
.
NC blocks
...
5 TOOL CALL 12 Z S6000 Tool call
6 L Z+100 R0 FMAX Retract in the tool axis
7 L X-15 Y-15 R0 F MAX M3 Pre-position in the plane, spindle on
8 L Z+0 R0 F MAX Approach the starting point in the tool axis
9 LBL 1 Set a mark
10 L IZ-2.5 F1000 Infeed depth in incremental values
11 CALL PGM CONT1_FWD.H Call the forward program
12 L IZ-2.5 F1000 Infeed depth in incremental values
13 CALL PGM CONT1_FWD.H Call backward program
14 CALL LBL 1 REP3 Repeat pgm part three times starting with block 9
15 L Z+100 R0 F MAX M2 Retract tool, end of program