Siemens SINUMERIK 840D sl Function Manual page 1762

Detailed description
2.3 Feedrate control
Programming path motion
The path feedrate is programmed under the address F and remains valid until an input signal
is present. This value acts modally.
F2=... to F7=... can be used in addition to the path feedrate to program up to 6 further
feedrates in the block.
The numerical expansion indicates the bit number of the input that activates the feedrate
when changed:
e.g., F7=1000 ; 7 corresponds to input bit 7.
Bits 2 to 7 are permissible for numerical expansion of the feedrate. The programmed values
act nonmodally. The path feedrate programmed under F applies in the next block.
Dwell (sparking out time) and retraction path are programmed under separate addresses in
the block:
ST=...
SR=...
These addresses apply nonmodally.
Programming axial motion
The axial feedrates are programmed under address FA and remain valid until an input signal
is present. They act modally.
FMA[2,x]=... to FMA[7,x]=... can be used to program up to 6 further feedrates per
axis in the block.
The first expression in square brackets indicates the bit number of the input that activates
the feedrate when changed. The second expression indicates the axis to which the feedrate
applies.
Example:
FMA[3,Y]=1000
Bits 2 to 7 are permissible for the numerical expansion of the axial feedrate. The values
programmed under FMA are active nonmodally. The feedrate programmed under FA applies
to the next block.
Dwell (sparking out time) and retraction path can also be defined for a single axis:
STA[x]=...
SRA[x]=...
The expression in square brackets indicates the axis for which the sparking out time and
retraction path apply.
STA[X]=2.5
SRA[X]=3.5
These addresses apply nonmodally.
46
dwell (for grinding sparking out time)
Retraction path
;axial feedrate for Y axis,
;corresponds to input bit 3
;dwell (sparking out time), axis-specific
;retraction path, axis-specific
;sparking out time 2.5 seconds
;retraction path 3.5 (unit e.g.,: mm)
Basic logic functions: Feeds (V1)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0