Interrupting Machining - HEIDENHAIN iTNC 530 User Manual

Interrupting machining

There are several ways to interrupt a program run:
Programmed interruptions
Pressing the machine STOP button
Switching to "Single Block" program run
Programming of noncontrolled axes (counter axes)
If the TNC registers an error during program run, it automatically
interrupts the machining process.
Programmed interruptions
You can program interruptions directly in the part program. The TNC
interrupts the program run at a block containing one of the following
entries:
G38 (with and without miscellaneous function)
Miscellaneous functions M0, M2 or M30
Miscellaneous function M6 (defined by the machine tool builder)
Interrupting the machining process with the machine STOP
button
U Press the machine STOP button: The block which the TNC is
currently executing is not completed. The asterisk in the status
display blinks
U If you do not wish to continue the machining process, you can reset
the TNC with the INTERNAL STOP soft key. The asterisk in the
status display goes out. In this case, the program must be restarted
from the program beginning
Interrupting the machining process by switching to the Program
Run, Single Block mode of operation
You can interrupt a program that is being run in the Program Run, Full
Sequence mode of operation by switching to the Program Run, Single
Block mode. The TNC interrupts the machining process at the end of
the current block.
Jumps within the program after an interruption
If program run is interrupted with the INTERNAL STOP function, the
TNC memorizes the current machining status. You can usually resume
machining with NC start. If you select other program lines with the
GOTO key, the TNC does not reset modally effective functions (e.g.
M136). This may have undesired effects, such as incorrect feed rates.
Danger of collision!
Please note that program jumps with the GOTO function
do not reset modal functions.
If you want to restart a program after an interruption,
always select the program with the PGM MGT key.
HEIDENHAIN iTNC 530 547