HEIDENHAIN iTNC 530 (340 422) ISO programming - Manual (Page 149)

HEIDENHAIN iTNC 530 149
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Automatic tool change if the tool life expires: M101
The TNC automatically changes the tool if the tool life TIME2 expires
during program run. To use this miscellaneous function, activate M101
at the beginning of the program. M101 is reset with M102.
The tool is not always changed immediately, but, depending on the
workload of the control, a few NC blocks later.
Prerequisites for standard NC blocks with radius compensation
R0, RR, RL
The radius of the replacement tool must be the same as that of the
original tool. If the radii are not equal, the TNC displays an error
message and does not replace the tool.
The function of M101 can vary depending on the individual
machine tool. The machine tool manual provides further
information.