HEIDENHAIN iTNC 530 (340 49x-02) ISO programming - Manual (Page 534)

534 12 Test Run and Program Run
12.4 Pr
ogr
am Run
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.
If the program was interrupted by one of the conditions described
below, the TNC saves the point of interruption.
„ EMERGENCY STOP
„ Power interruption
„ Control software crash
After you have called the mid-program startup function, you can press
the soft key SELECT LAST N to reactivate the point of interruption and
approach it with an NC start. After switch-on the TNC then shows the
message NC program was interrupted.
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 applies
if you have only changed the tool length.