HEIDENHAIN TNC 620 (73498x-02) ISO programming - Manual (Page 460)

Test run and program run
16.4 Test Run
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TNC 620 | User's Manual for DIN/ISO 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.