HEIDENHAIN TNC 335 Technical Manual - Manual (Page 294)

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TNC 360 15 Tool Changer 4-197
15.1.1 Special tools
Special tools are oversize tools where pockets on either side in the tool magazine have to be left
vacant .
P7 P8 P9 P6 P5 P10
The number of pockets to be left vacant on both sides of the tool is defined in machine parameter
MP7264. Special tools are identified by an "S" in the tool table. The numbers of the vacant pockets
are not displayed. Variable pocket coding can be limited for special tools. If marker M2601 is set,
then special tools are returned to their original pocket despite the "variable pocket coding" setting.
MP7264 Number of pockets reserved next to special tool
Input range: 0 to 3
Set Reset
M2601 Special tool to original pocket PLC PLC
despite variable pocket coding
15.2 Controlling the tool changer
Controlling the tool changer, i.e. positioning the changing arm and carousel and the complete
toolchange sequence is performed by the PLC. The NC handles tool pocket assignment and
evaluation of the TOOL DEF and TOOL CALL blocks. The NC and PLC communicate by markers and
words.
The TOOL DEF block can be used to pre-position the tool changer. After a tool has been changed,
the next tool is programmed with TOOL DEF. The PLC evaluates the tool and pocket number and
pre-positions the tool changer at the follow-up tool.