Siemens Sinumerik 840D sl Programming Manual page 104

Feed control
8.1 Feedrate (G93, G94, G95, F, FGROUP, FL, FGREF)
With this type of programming, the F value programmed in N110 is evaluated as the rotary
axis feedrate in degrees/min, while the feedrate evaluation in N120 is either 100 inch/min or
100 mm/min, dependent upon the currently active G70/G71/G700/G710 setting.
NOTICE
Feedrate difference
FGREF evaluation also works if only rotary axes are programmed in the block. The normal F
value interpretation as degrees/min applies in this case only if the radius reference
corresponds to the FGREF default:
● For G71/G710: FGREF[A]=57.296
● For G70/G700: FGREF[A]=57.296/25.4
Read reference radius
The value of the reference radius of a rotary axis can be read using system variables:
● In synchronized actions or with preprocessing stop in the part program via system variable:
● Without preprocessing stop in the part program via system variable:
If no values are programmed, the default 360 mm/(2π) = 57.296 mm (corresponding to 1 mm
per degree) will be read in both variables.
For linear axes, the value in both variables is always 1 mm.
Read path axes affecting velocity
The axes involved in path interpolation can be read using system variables:
● In synchronized actions or with preprocessing stop in the part program via system variables:
● Without preprocessing stop in the part program via system variables:
Path reference factors for orientation axes with FGREF
104
$AA_FGREF[<axis>]
$PA_FGREF[<axis>]
$AA_FGROUP[<axis>]
$AC_FGROUP_MASK
$PA_FGROUP[<axis>]
$P_FGROUP_MASK
Current main run value
Programmed value
Returns the value "1" if the specified axis affects the path ve‐
locity in the current main run record by means of the basic set‐
ting or through FGROUP programming. Otherwise, the variable
returns the value "0".
Returns a bit key of the channel axes programmed with
FGROUP which are to affect the path velocity.
Returns the value "1" if the specified axis affects the path ve‐
locity by means of the basic setting or through FGROUP pro‐
gramming. Otherwise, the variable returns the value "0".
Returns a bit key of the channel axes programmed with
FGROUP which are to affect the path velocity.
Programming Manual, 01/2015, 6FC5398-1BP40-5BA2
Fundamentals