HEIDENHAIN TNC 640 (34059x-02) - Manual (Page 234)

Programming: Programming contours
6.6 Path contours – FK free contour programming
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TNC 640 | User's Manual
HEIDENHAIN Conversational Programming | 5/2013
Closed contours
You can identify the beginning and end of a closed contour with the
CLSD soft key. This reduces the number of possible solutions for
the last contour element.
Enter CLSD as an addition to another contour data entry in the first
and last blocks of an FK section.
Beginning of
contour: CLSD+
End of contour: CLSD–
Example NC blocks
12 L X+5 Y+35 RL F500 M3
13 FC DR- R15 CLSD+ CCX+20 CCY+35
...
17 FCT DR- R+15 CLSD-