HEIDENHAIN TNC 320 (340 551-02) - Manual (Page 414)

414 11 Test Run and Program Run
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am Run
Mid-program startup (block scan)
With the RESTORE POS. AT 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 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.
User requests are not possible during mid-program
startup.
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 applies
if you have only changed the tool length.
The TNC skips all touch probe cycles in a mid-program
startup. Result parameters that are written to from these
cycles might therefore remain empty.