HEIDENHAIN TNC 320 (340 551-01) - Manual (Page 108)

108 5 Programming: Tools
5.2 T
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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 changed automatically
„ after the next NC block after expiration of the tool life, or
„ at latest one minute after tool life expires (calculation is for a
potentiometer setting of 100%)
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.
If the tool life ends during an active M120 (look ahead),
the TNC waits to change the tool until after the block in
which you canceled the radius compensation with an R0
block.
The TNC automatically changes the tool even if a fixed
cycle is being run.
As long as a tool change program is running, the TNC
makes no automatic tool change.