Path Feedrate F - Siemens SINUMERIK 840D Function Manual

V1: Feedrates

5.2 Path feedrate F

● Via the PLC
● Per program command
5.2 Path feedrate F
Path feedrate F
The path feedrate represents the geometrical total of the speed components in the participating
axes. It is therefore generated from the individual motions of the interpolating axes.
The default uses the axial speeds of the geometry axes which have been programmed. The
FGROUP command can be used to include other geometry and/or synchronized axes in the
calculation of the path feedrate.
The path feedrate F determines the machining speed and is observed in every type of
interpolation even where allowance is made for tool offsets. The value programmed under the
address F remains in a program until a new F value or a new type of feedrate is programmed.
Range of values for path feedrate F
See Description of Functions G2: "Speeds, Setpoint / Actual Value Systems, Closed-Loop
Control", Section: "Velocities (Page 31)".
F value at PLC interface
The F value of the current path feedrate is always entered in the channel-specific PLC interface
for auxiliary functions (DB21, ... DBB158 to 193).
For explanations of the associated interface signals (change signal, F value), see Function
Manual "Basic Functions" "H2: Auxiliary function outputs to PLC".
Feedrate with transition circle
Further information
Programming Manual Fundamentals
Feedrate for internal radius and external radius path sections
For circular blocks or spline blocks with curvature in the same direction and tool radius offset
activated (G41/G42), the programmed feedrate can act on the center point path or on the
contour (depending on the internal radius or external radius path sections).
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Axes and spindles
Function Manual, 06/2019, A5E47437747B AA