HEIDENHAIN TNC 306 Technical Manual - Manual (Page 199)

2/97
TNC 406/TNC 306 7 M-functions 4-99
7.3 Program-halt on M06
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-halt occurs on M06 then the program must be restarted after the
tool change. This can also be carried out directly by the PLC.
7.4 M-function M89
M89 can be used for the modal cycle-call.
The possibilities for calling a cycle are:
– With the NC-block "CYCL CALL."
– With the miscellaneous function M99. M99 is only effective for a single block and must
be reprogrammed for each execution.
– With the miscellaneous function M89 (depending on the machine parameter).
M89 as a cycle-call is modally effective, i.e. for every following positioning block
there will be a call of the last-programmed machining-cycle. M89 is canceled by M99 or
a CYCL CALL-block.
If M89 is not defined as a modal cycle-call by machine parameters, then M89 will be transferred to
the PLC as a normal M-function at the beginning of the block.
MP7440 Output of M-functions
Entry range: 0 to 7
Bit 0 Program-halt on M06 + 0 = Program-halt on M06
+ 1 = No program-halt on M06
Bit 1 modal cycle-call M89 + 0 = Normal code-transfer of
M89 at beginning of block
+ 2 = Modal cycle-call M89 at end of block
Bit 2 Program-halt on + 0 = Program-halt until acknowledgment
M-functions of M-function
+ 4 = No program-halt,
do not wait for acknowledgment