Siemens SINUMERIK 840DE Programming Manual page 294

Feedrate Control and Spindle Motion
7.16 Multiple feedrate values in one block (F.., ST=.., SR=.., FMA.., STA=.., SRA=..)
FMA[2,x]= to FMA[7,x]=Multiple axial motions in 1 block
STA=
SRA=
Parameters
F2=... to F7=...==
ST=...
SR=...
FMA[2,x]=... to
FMA[7,x]=...
STA=...
SRA=...
FA, FMA and F value
The axial feedrate (FA or FMA value) or path feedrate (F value) corresponds to 100%
feedrate. You can use this function to realize feedrates that are smaller than or equal to the
axial feedrate or the path feedrate.
References
/FB1/Description of Functions, V1, Feedrates
Note
If feedrates, dwell time or return path are programmed for an axis on account of an external
input, this axis must in this block must not be programmed as POSA axis (positioning axis
over multiple blocks).
Look Ahead is also active for multiple feedrates in one block. In this way, the current
feedrate is restricted by the Look Ahead value.
Example of programming path motion
The path feed is programmed under the address F and remains valid until an input signal is
present. The numerical expansion indicates the bit number of the input that activates the
feedrate when changed:
F7=1000
F2=20
ST=1
SR=0.5
7-44
In addition to the path feed, you can program up to 6
further feedrates in the block; non modal
Dwell time (for grinding technology: sparking-out time);
non modal
Return path; non modal. The unit for the retraction path
refers to the current valid unit of measurement (mm or
inch).
In addition to the path feed, you can program up to 6
further feedrates per axis in the block; non modal
Axial dwell time (for grinding technology: sparking-out
time); non modal
Axial return path; non modal
;7 corresponds to input bit 7
;2 corresponds to input bit 2
;Dwell time (s) input bit 1
;Return path (mm) input bit 0
Programming Manual, 10.2004 Edition, 6FC5 298-7AB00-0BP1
Fundamentals