HEIDENHAIN TNC 426B (280 472) ISO programming - Manual (Page 304)

HEIDENHAIN TNC 410, TNC 426, TNC 430 289
Mid-program startup (block scan)
The RESTORE POS AT N feature must be enabled and
adapted by the machine tool builder. Your machine
manual provides more detailed information.
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.
Mid-program startup must not begin in a subprogram.
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 (TNC 410: press the RESTORE POS. AT N soft key
and START).
After a block scan, return the tool to the calculated
position with RESTORE POSITION.
For the TNC 426, TNC 430:
All necessary programs, tables and pallet files must be
selected in a program run mode of operation (status M).
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.
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.
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