HEIDENHAIN TNC 620 User Manual page 659

Functions of the TNC 620 and the iTNC 530 compared 18.5
Comparison: Differences in Program Run, traverse
movements
Caution: Check the traverse movements!
NC programs that were created on earlier TNC controls may lead to different traverse movements or
error messages on a TNC 620!
Be sure to take the necessary care and caution when running-in programs!
Please find a list of known differences below. The list does not pretend to be complete!
Function
Handwheel-superimposed
traversing with M118
Deleting basic rotation with M143
Scaling approach/departure
movements (APPR/DEP/RND)
Approach/departure with
APPR/DEP
Approach/departure with
APPR/DEP if contour elements
with length 0 are defined
HEIDENHAIN | TNC 620 | Conversational Programming User's Manual | 10/2015
TNC 620
Effective in the active coordinate
system (which may also be rotated
or tilted), or in the machine-based
coordinate system, depending on
the setting in the 3-D ROT menu
for manual operation
M143 deletes the entries in
columns SPA, SPB and SPC in
the preset table, reactivating the
corresponding preset table row
does not activate the deleted
basic rotation
Axis-specific scaling factor is
allowed, radius is not scaled
Error message if R0 is
programmed for APPR/DEP LN or
APPR/DEP CT
Contour elements with length
0 are ignored. The approach/
departure movements are
calculated for the first or last valid
contour element
iTNC 530
Effective in the machine-based
coordinate system
M143 does
not delete the
entry in the ROT column in the
preset table, reactivating the
corresponding preset table row
does not activate the deleted basic
rotation
Error message
Tool radius 0 and compensation
direction RR are assumed
An error message is issued if a
contour element with length 0 is
programmed after the APPR block
(relative to the first contour point
programmed in the APPR block)
For a contour element with length
0 before a DEP block, the TNC
does not issue an error message,
but uses the last valid contour
element to calculate the departure
movement
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