HEIDENHAIN TNC 620 Programming Station, User Manual

Page: 577 / 695

Program run 16.5
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HEIDENHAIN | TNC 620 | ISO Programming User's Manual | 9/2016
577
Resuming program run after an interruption
If you interrupt an NC program using the
INTERNAL
STOP
key, you have to start machining at the start of
the program or using the
BLOCK SCAN
function.
With machining cycles, mid-program startup is
always executed at the start of the cycle. If you
interrupt a program run during a machining cycle, the
control repeats machining steps already carried out
after a block scan.
If you interrupt the program run within a program section repetition,
or within a subprogram, you must return to the interruption point
using the
BLOCK SCAN
function.
When a program run is interrupted, the TNC stores:
The data of the last defined tool
Active coordinate transformations (e.g. datum shift, rotation,
mirroring)
The coordinates of the circle center that was last defined
Note that the stored data remain active until they are
reset (e.g. if you select a new program).
The TNC uses the stored data for returning the tool to the contour
after manual machine axis positioning during an interruption
(
RESTORE POSITION
soft key).
Resuming the program run with the NC Start key
You can resume program run by pressing the machine
START
button if the program was interrupted in one of the following ways:
Press the
NC STOP
key
Programmed interruption
Resuming program run after an error
With an erasable error message:
Remove the cause of the error
Clear the error message from the screen: Press the
CE
key
Restart the program, or resume program run where it was
interrupted