Siemens SINUMERIK 828D Function Manual page 1400

V1: Feedrates
17.4 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.
If feedrates, a sparking out time (dwell) or retraction path are programmed for an axis on account of an external
input, this axis must not be programmed as a POSA axis in this block (positioning axis beyond end of block).
1400
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)
Function Manual, 09/2011, 6FC5397-0BP40-2BA0
Basic Functions