HEIDENHAIN TNC 320 User Manual page 531

Functions of the TNC 320 and the iTNC 530 compared 16.5
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 320!
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
traverse with M118
Approach/Departure with
APPR/DEP, R0 is active, contour
element plane is not equal to
working plane
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
TNC 320 | User's Manual HEIDENHAIN Conversational Programming | 5/2013
TNC 320
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
If possible, the blocks are
executed in the defined contour
element plane, error message
for APPRLN, DEPLN, APPRCT,
DEPCT
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
If possible, the blocks are
executed in the defined working
plane; error message for
APPRLN, APPRLT, APPRCT,
APPRLCT
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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