Feedrate Control and Spindle Motion
7.17 Blockwise feed (FB...)
Fundamentals
Programming Manual, 10.2004 Edition, 6FC5 298-7AB00-0BP1
7-45
Example of programming axial motion
The axial path feed is programmed under the address FA and remains valid until an input
signal is present.
FMA[7,x]= to FMA[2,x]= can be used to program up to 6 further feeds per axis in the block.
The first expression in the square brackets indicates the bit number of the input; the second
the axis for which the feedrate is to apply
FMA[3,y]=1000 ;Axial feedrate with the value 1000 for Y axis, 3
;corresponds to input bit 3
Example of axial dwell time and return path
Dwell time and return path are programmed under the following additional addresses:
STA[x]=... ;Axial dwell time (s) input bit 1
SRA[x]=... ;Axial return path (mm) input bit 0
If input bit 1 is activated for the dwell time or bit 0 for the return path, the distance to go for
the path axes or the relevant single axes is deleted and the dwell time or return started.
Example of several operations in one block
N20 T1 D1 F500 G0 X100 ;Initial setting
N25 G1 X105 F=20 F7=5
F3=2.5 F2=0.5 ST=1.5 SR=
0.5
;Normal feedrate with F, roughing with F7, finishing
with
;F3, smooth-finishing with F2, dwell time 1.5 s
;return path 0.5 mm
N30 ...
…
7.17 Blockwise feed (FB...)
Function
You can use the function "Blockwise feedrate" to define a separate feedrate for a single
block.
The address FB is used to define the feedrate only for the current block. After this block, the
previously active modal feedrate is active.
The feedrate is interpreted according to the active feedrate type:
G94: feedrate in mm/min or °/min
G95: feedrate in mm/rev or inch/rev
G96: constant cutting rate
References: Description of Functions /FB1/, V1, Feedrates
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