Siemens sinumerik 840d Programming Manual page 326

Path Traversing Behavior
9
9.5 Feed characteristic, FNORM, FLIN, FCUB, FPO
840D 840D
NCU 571 NCU 572
NCU 573
These additional characteristics make it possible to
program continuously smooth velocity characteristics
depending on the curvature of the workpiece to be
machined.
Sequence
FNORM
The feed address F defines the path feed as a
constant value according to DIN 66025.
Please refer to Programming Guide "Fundamentals"
for more detailed information on this subject.
FLIN
The feed characteristic is approached linearly from
the current feed value to the programmed F value
until the end of the block.
Example:
N30 F1400 FLIN X50
9-326
840Di
SINUMERIK 840D/840Di/810D/FM-NC Programming Guide Advanced (PGA) – 04.00 Edition
Feedrate
Feedrate
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08.97
9
Path
Path