HEIDENHAIN TNC 426 CB, Technical Manual

Page: 615 / 1135

December 2001 Display and Operation 6 – 285
Program stop with
M06 According to ISO 6983, the M function M06 means “tool change.”
7 7 7 7 With MP7440 bit 0, select program stop when M06 is transferred to the
PLC. After the program stop and the tool change, the NC program must be
restarted through an NC start or by the PLC.
Modal cycle call
M89 You can use the M function M89 to program a modal cycle call. The
possibilities for calling a cycle are:
n
NC block CYCL CALL
n
Miscellaneous function M99. M99 is non-modal, i.e. it must be specially
programmed each time is it to be executed.
n
Miscellaneous function M89. M89 depends on MP7440 bit 1. M89 is
effective modally as a cycle call, i.e. in each subsequent positioning block,
the fixed cycle last programmed is called. M89 is cancelled by M99 or by a
CYCL CALL block.
If M89 is not defined as a modal cycle call, it is transferred to the PLC as a
normal M function at the beginning of the block.
Reduced feed rate
of tool axis with
M103 With M103 F.. you can reduce the contouring feed rate for motion in the
negative direction of the tool axis. The tool axis share of the feed rate is limited
to a value that the TNC calculated from the most recently programmed feed
rate.
F
max
= F
prog
· F
%
F
max
= maximum feed rate in the negative direction of the tool axis
F
prog
= most recently programmed feed rate
F
%
= programmed factor behind M103 as a percentage
M103 F.. is canceled by re-entering M103 without a factor.
7 7 7 7 Enable the M103 F.. function with MP7440 bit 2.