HEIDENHAIN iTNC 530 (60642x-04) - Manual (Page 655)

HEIDENHAIN iTNC 530 655
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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 start at
a machining position within a smarT.NC point table (.HP), you can
select the start position via soft key with graphic support. When
starting at a machining position within a point table with the file
extension .PNT, the TNC does not provide graphic support. However,
you can use the point number to select any point as startup position.
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 listed 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 BLOCK to reactivate the point of
interruption and approach it with an NC start. After switch-on the TNC
shows the message NC program canceled.
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 if you have only changed the tool length.
The additional functions M142 (delete modal program
information) and M143 (delete basic rotation) are not
permitted during a mid-program startup.