HEIDENHAIN TNC 620 User Manual page 279

Path contours – FK free contour programming (option 19)
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:
End of contour:
Example NC blocks
N10 G01 X+5 Y+35 G41 F500 M3*
N20 FC DR- R15 CLSD+ CCX+20 CCY+35*
...
N30 FCT DR- R+15 CLSD-*
HEIDENHAIN | TNC 620 | ISO Programming User's Manual | 9/2016
CLSD+
CLSD–
6
6.6
279