Może masz coś namieszane w makrach od M kodów, bo raczej nie kontrola złamania narzędzia.

Znalazłem coś takiego:
"According to ISO 6983, the M-Function M06 means a tool change. Machine parameter MP7440, Bit
0 can be used to select whether on transferring M06 to the PLC the program should halt. If the
control is set so that a program-run interruption occurs on M06 then the program must be restarted
after the tool change. This can also be carried out directly by the PLC."