Siemens SINUMERIK 840D sl Function Manual page 1780

Examples
4.1 Feedrate programming for chamfer/rounding FRC, FRCM
Example 2: Preceding block feedrate
MD20201 CHFRND_MODE_MASK Bit0 = 1
(apply feedrate from preceding block; recommended setting)
N10
N20
N30
N40
N50
N60
N70
N80
N90
N100
N110
N120
N130
N140
...
M02
64
G0 X0 Y0 G17 F100 G94
G1 X10 CHF=2
Y10 CHF=4 FRC=120
X20 CHF=3 FRC=200
RNDM=2 FRCM=50
Y20
X30
Y30 CHF=3 FRC=100
X40
Y40 FRCM=0
S1000 M3
X50 CHF=4 G95 F3 FRC=1
Y50
X60
; Chamfer N20-N30 with F=100 mm/min
; Chamfer N30-N40 with FRC=120 mm/min
; Chamfer N40-N60 with FRC=200 mm/min
; Modal rounding N60-N70 with
FRCM=50 mm/min
; Modal rounding N70-N80 with
FRCM=50 mm/min
; Chamfer N80-N90 with
FRC=100 mm/min (modal)
; Modal rounding N90-N100 with
FRCM=50 mm/min
; Modal rounding N100-N120 with
F=100 mm/min
Chamfer N120-N130 with G95
FRC=1 mm/rev
Modal rounding N130-N140
with F=3 mm/rev
Basic logic functions: Feeds (V1)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0