Siemens SINUMERIK 840D sl Programming Manual page 123

FPRAON(...):
FPRAOF(...):
<axis>:
SPI(<n>)/S<n>:
Note
The programmed feedrate FA[...] is modal.
Up to five feedrates for positioning axes or spindles can be programmed in each NC block.
Note
The derived feedrate is calculated according to the following formula:
Derived feedrate = programmed feedrate * absolute master feedrate
Examples
Example 1: Synchronous spindle coupling
With synchronous spindle coupling, the positioning speed of the following spindle can be
programmed independently of the master spindle, e.g. for positioning operations.
Program code
...
FA[S2]=100
...
Example 2: Derived revolutional feedrate for path axes
Path axes X, Y must be traversed at the revolutional feedrate derived from rotary axis A:
Program code
...
NC programming
Programming Manual, 12/2019, 6FC5398-2EP40-0BA0
Derive rotational feedrate for positioning axes and spindles
The first parameter (<axis>/SPI(<n>)/S<n>) identifies the positioning
axis/spindle to be traversed with revolutional feedrate.
The second parameter (<rotary axis>/SPI(<n>)/S<n>) identifies the
rotary axis/spindle from which the revolutional feedrate is to be derived.
Note:
The second parameter can be omitted, in which case the feedrate will be
derived from the master spindle.
FPRAOF is used to deselect the derived revolutional feedrate for the speci‐
fied axes or spindles.
Axis identifier (positioning or geometry axis)
Spindle identifier
SPI(<n>) and S<n> are identical in terms of function.
Spindle number
<n>:
Note:
SPI converts spindle numbers into axis identifiers. The transfer parame‐
ter (<n>) must contain a valid spindle number.
Comment
; Positioning speed of the following spindle (spindle 2) = 100
degrees/min
Fundamentals
2.7 Feed control
123