HEIDENHAIN TNC 620 (81760x-02) ISO programming - Manual (Page 530)

Test run and program run
16.8 Optional program-run interruption
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TNC 620 | User's ManualDIN/ISO Programming | 2/2015
16.8 Optional program-run interruption
Application
The behavior of this function varies depending on the
respective machine.
Refer to your machine manual.
The TNC optionally interrupts program run at blocks containing M1.
If you use M1 in the Program Run mode, the TNC does not switch
off the spindle or coolant.
Do not interrupt program run or test run at blocks
containing M1: Set soft key to
OFF
Interrupt program run or test run at blocks
containing M1: Set soft key to
ON