Siemens SINUMERIK 828D Manual page 163

Reference section
FNORM Basic setting. The feedrate value is defined via the block's path and
subsequently applies as a modal value.
FLIN Linear path velocity profile:
The feedrate value is approached linearly using the path, from the current
value at the start of the block right through to the end of the block; it then
applies as a modal value.
FCUB Cubic path velocity profile:
The F values that have been programmed block-by-block are combined
(in relation to the end of the block) by means of a spline. The spline starts
and ends at a tangent to the previous or subsequent feedrate function. If
the F address is missing from a block, the most recently programmed F
value will be used for this purpose.
F=FPO(..) Path velocity profile via polynomial:
The F address describes the feedrate characteristic on the basis of a
polynomial, from the current value right through to the end of the block.
The end value is valid thereafter as a modal value.
endfeed Feedrate at end of block
quadf Quadratic polynomial coefficient
ubf Cubic polynomial coefficient
Path reference
FGROUP(X, Y, Defines the path axes in relation to the feedrate, i.e. the overall feedrate
Z,...) relates to the axes defined here.
Example: FGROUP(X, Y), then the following applies:
Jerk
SOFT Jerk limitation
BRISK Acceleration limitation
Feedforward control
FFWON Feedforward control on
FWOF Feedforward control off
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