Siemens SINUMERIK 840D sl Programming Manual page 532

Path traversing behavior
8.1 Tangential control (TANG, TANGON, TANGOF, TLIFT, TANGDEL)
The path axis is used for turning if the following axis has been used once as the path axis. A
maximum axis velocity of the following axis can be achieved with function TFGREF[ax] =
0.001.
If the follow-up axis was not previously traversed as a path axis it is now traversed as a
positioning axis. The velocity is then dependent on the positioning velocity in the machine
data.
The axis is rotated at its maximum possible velocity.
Optimization possibility
Velocity jumps of the following axis caused by jumps in the leading axis contour are rounded
and smoothed with (Dist and Angletol).
The following axis is controlled with look-ahead (see diagram) to keep deviations as small as
possible.
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Programming Manual, 06/2009, 6FC5398-2BP20-0BA0
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