Siemens SINUMERIK 840D sl Programming Manual page 110

Feed control
7.1 Feedrate (G93, G94, G95, F, FGROUP, FL, FGREF)
Examples
Example 1: Mode of operation of FGROUP
The following example is intended to demonstrate the effect of FGROUP on the path and path
feedrate. The variable $AC_TIME contains the time of the block start in seconds. It can only
be used in synchronized actions.
Program code
N100 G0 X0 A0
N110 FGROUP(X,A)
N120 G91 G1 G710 F100
N130 DO $R1=$AC_TIME
N140 X10
N150 DO $R2=$AC_TIME
N160 X10 A10
N170 DO $R3=$AC_TIME
N180 A10
N190 DO $R4=$AC_TIME
N200 X0.001 A10
N210 G700 F100
N220 DO $R5=$AC_TIME
N230 X10
N240 DO $R6=$AC_TIME
N250 X10 A10
N260 DO $R7=$AC_TIME
N270 A10
N280 DO $R8=$AC_TIME
N290 X0.001 A10
N300 FGREF[A]=360/(2*$PI)
N310 DO $R9=$AC_TIME
N320 X0.001 A10
N330 M30
Example 2: Traverse synchronized axes with limit velocity FL
The path velocity of the path axes is reduced if the synchronized axis Z reaches the limit
velocity.
Program code
N10 G0 X0 Y0
N20 FGROUP(X)
N30 G1 X1000 Y1000 G94 F1000 FL[Y]=500
N40 Z-50
110
Comment
; Feedrate = 100 mm/min or 100 degrees/min
; Feedrate = 100 mm/min, path = 10 mm, R1 = approx. 6 s
; Feedrate = 100 mm/min, path = 14.14 mm, R2 = approx. 8 s
; Feedrate = 100 degrees/min, path = 10 degrees, R3
= approx. 6 s
; Feedrate = 100 mm/min, path = 10 mm, R4 = approx. 6 s
; Feedrate = 2540 mm/min or 100 degrees/min
; Feedrate = 2540 mm/min, path = 254 mm, R5 = approx. 6 s
; Feedrate = 2540 mm/min, path = 254.2 mm, R6 = approx. 6
s
; Feedrate = 100 degrees/min, path = 10 degrees, R7
= approx. 6 s
; Feedrate = 2540 mm/min, path = 10 mm, R8 = approx.
0.288 s
; Set 1 degree = 1 inch via the effective radius.
; Feedrate = 2540 mm/min, path = 254 mm, R9 = approx. 6 s
Programming Manual, 09/2011, 6FC5398-1BP40-2BA0
Fundamentals