HEIDENHAIN TNC 426 B User Manual page 309

The stored data are used for returning the tool to the contour after
manual machine axis positioning during an interruption (RESTORE
POSITION).
Resuming program run with the START button
You can resume program run by pressing the machine START
button if the program was interrupted in one of the following ways:
The machine STOP button was pressed
A programmed interruption
Resuming program run after an error
If the error message is not blinking
Remove the cause of the error.
To clear the error message from the screen, press the CE key.
Restart the program, or resume program run at the place at which
it was interrupted.
If the error message is blinking
Press and hold the END key for two seconds. This induces a TNC
system restart.
Remove the cause of the error.
Start again.
If you cannot correct the error, write down the error message and
contact your repair service agency.
Mid-program startup (block scan)
The RESTORE POS AT N feature must be enabled and
adapted by the machine tool builder. Your machine
manual provides more detailed information.
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.
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11 Test Run and Program Run