Siemens SINUMERIK 840D sl Programming Manual page 454

Path traversing behavior
10.2 Feedrate characteristic (FNORM, FLIN, FCUB, FPO)
FNORM
The feed address F defines the path feedrate as a constant value according to DIN 66025.
Please refer to Programming Manual "Fundamentals" for more detailed information on this
subject.
FLIN
The feedrate characteristic is approached linearly from the current feedrate value to the
programmed F value until the end of the block.
Example:
N30 F1400 FLIN X50
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Programming Manual, 03/2013, 6FC5398-2BP40-3BA1
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