Non-Modal Feedrate (Fb) - Siemens SINUMERIK 840D sl Programming Manual
Nc programming
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Fundamentals
2.7 Feed control
Example 2: Axial motion
Program code
POS[A]=300 FA[A]=800 FMA[7,A]=720 FMA[6,A]=640
FMA[5,A]=560 STA[A]=1.5 SRA[A]=0.5
Example 3: Multiple operations in one block
Program code
N20 T1 D1 F500 G0 X100
N25 G1 X105 F=20 F7=5 F3=2.5 F2=0.5 ST=1.5 SR=0.5
...
2.7.11
Non-modal feedrate (FB)
The "Non-modal feedrate" function can be used to define a separate feedrate for a single block.
After this block, the previous modal feedrate is active again.
Syntax
FB=<value>
Meaning
FB:
<VALUE>:
136
Feedrate for current block only
The programmed value must be greater than zero.
Values are interpreted based on the active feedrate type:
● G94: feedrate in mm/min or degrees/min
● G95: feedrate in mm/rev or inch/rev
● G96: constant cutting rate
Comment
; Feedrate for axis A = 800
; Additional feedrate values for axis A: 720
(input bit 7)
; 640 (input bit 6)
; 560 (input bit 5)
; Axial dwell time: 1.5 s
; Axial retraction: 0.5 mm
Comment
Initial setting
; Normal feedrate with F,
; roughing with F7,
; finishing with F3,
; smooth-finishing with F2,
; dwell time 1.5 s,
; retraction path 0.5 mm
Programming Manual, 12/2019, 6FC5398-2EP40-0BA0
NC programming
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