Siemens SINUMERIK 840D sl Programming Manual page 134

Fundamentals
2.7 Feed control
F2=... to F7=... :
ST=... :
SR=... :
FA[<Ax>]=... :
FMA[2,<Ax>]=... to FMA[7,<Ax>]=... :
STA[<Ax>]=...:
SRA[<Ax>]=...:
<Ax>:
Note
Priority of the signals
The signals are scanned in ascending order starting at input bit 0 (I0). Therefore, the retraction
motion has the highest priority and the feedrate F7 the lowest priority. Dwell time and retraction
motion end the feedrate motions that were activated with F2 to F7.
The signal with the highest priority determines the current feedrate.
134
In addition to the path feedrate, up to six further
feedrates can be programmed in the block. The
numerical expansion indicates the bit number of
the input that activates the feedrate when
changed:
Effective: Non-modal
Dwell time in s (for grinding technology: sparking-
out time)
Input bit: 1
Effective: Non-modal
Retraction path
The unit for the retraction path refers to the cur‐
rent valid unit of measurement (mm or inch).
Input bit: 0
Effective: Non-modal
The axial feedrate is programmed under the ad‐
dress FA and remains valid during the absence of
an input signal.
Effective: Modal
In addition to the axial feedrate FA up to six fur‐
ther feedrates per axis can be programmed in the
block with FMA. The first parameter indicates the
bit number of the input and the second the axis
for which the feedrate is to apply.
Effective: Non-modal
Axial dwell time in s (for grinding technology:
sparking-out time)
Input bit: 1
Effective: Non-modal
Axial retraction path
Input bit: 0
Effective: Non-modal
Axis for which the feedrate is to apply
Programming Manual, 12/2019, 6FC5398-2EP40-0BA0
NC programming