HEIDENHAIN TNC 620 User Manual page 679

Functions of the TNC 620 and the iTNC 530 compared 18.5
Function
Effect of Q parameters
Automatic cancelation of tool
radius compensation
NC blocks with M91
Behavior with M120 LA1
Block scan in a point table
Emtpy CC block (pole adoption
from last tool position) in the NC
program
Axis-specific scaling of RND block
Reaction if a contour element with
length 0 is defined before or after
a RND or CHF block
HEIDENHAIN | TNC 620 | ISO Programming User's Manual | 9/2016
TNC 620
Q60 to Q99 (QS60 to QS99)
arealways local.
Block with R0
DEP block
Program selection
END PGM
No consideration of tool radius
compensation
No effect on processing, as
the control interprets the input
internally as an LA0
The tool is positioned above the
next position to be machined
Last positioning block in the
working plane must contain both
coordinates of the working plane
RND block is scaled, the result is
an ellipse
Error message is issued
iTNC 530
Q60 to Q99 (QS60 to QS99)
are local or global, depending
on MP7251 in converted cycle
programs (.cyc). Nested calls may
cause problems
Block with R0
DEP block
Program selection
Programming of G73
ROTATION
PGM CALL
Consideration of tool radius
compensation
Possible undesired effect on
processing, as the control
interprets the entry internally as an
LA2
The tool is positioned above
the last position that has been
completely machined
Last positioning block in
the working plane does not
necessarily need to contain both
coordinates of the working plane.
Can cause problems with RND or
CHF blocks
Error message is issued
Error message is issued if a
contour element with length 0 is
located before the RND or CHF
block
Contour element with length 0
is ignored if the contour element
with length 0 is located after the
RND or CHF block
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