HEIDENHAIN TNC 410 ISO Programming - Manual (Page 406)

380 11 Test Run and Program Run
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n Mid-program startup (block scan)
With the RESTORE POS AT N feature (block scan) you can start a part
program at any block you desire. The TNC scans the program blocks
up to that point. Machining can be graphically simulated.
If you have interrupted a part program with an INTERNAL STOP, the
TNC automatically offers the interrupted block N for mid-program
startup.
The RESTORE POS AT N feature must be enabled and
adapted by the machine tool builder. Refer to your
machine manual.
Mid-program startup must not begin in a subprogram.
All necessary programs, tables and pallet files must be
selected in a program run mode of operation (status M).
If the program contains a programmed interruption before
the startup block, the block scan is interrupted. Press the
machine START button to continue the block scan.
After a block scan, return the tool to the calculated position
with RESTORE POSITION.
Tool length compensation does not take effect until after
the tool call and a following positioning block; this also
applies to an altered tool length.
For the TNC 426, TNC 430:
If you are working with nested programs, you can use
Machine Parameter 7680 to define whether the block scan
is to begin at block 0 of the main program or at block 0 of
the last interrupted program.
The function M128 is not permitted during a mid-program
startup.
If the working plane is tilted, you can use the 3-D ON/OFF
soft key to define whether the TNC is to return to the
contour in a tilted or in a non-tilted coordinate system.
If you want to use the block scan feature in a pallet table,
select the program in which a mid-program startup is to be
performed from the pallet table by using the arrow keys.
Then press the RESTORE POS AT N soft key.
All touch probe cycles and the Cycle 247 are skipped in a
mid-program startup. Result parameters that are written
to from these cycles might therefore remain empty.