HEIDENHAIN TNC 620 User Manual page 566

16
Test Run and Program Run
16.5 Program run
Resuming program run after an interruption
If you have to 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.
In machining cycles, block scan always takes place
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 stored data is used 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
With an non-erasable error message
Press and hold the END key for two seconds. This induces a
TNC system restart
Remove the cause of the error
Restart
If you cannot correct the error, write down the error message and
contact your service agency.
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HEIDENHAIN | TNC 620 | Conversational Programming User's Manual | 10/2015