HEIDENHAIN TNC 620 (81760x-01) - Manual (Page 528)

Test run and program run
16.8 Optional program-run interruption
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TNC 620 | User's Manual
HEIDENHAIN Conversational Programming | 3/2014
16.8 Optional program-run interruption
Application
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