HEIDENHAIN TNC 640 (34059x-02) - Manual (Page 568)

Test run and program run
17.4 Test Run
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TNC 640 | User's Manual
HEIDENHAIN Conversational Programming | 5/2013
Your machine tool builder can also define a tool-
change macro for the Test Run operating mode.
This macro will simulate the exact behavior of the
machine. Refer to your machine manual.