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Siemens SINUMERIK 840D sl Function Manual page 1345

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Dwell (sparking out time) and retraction path are programmed under separate addresses in
the block:
ST=...
SR=...
These addresses apply non-modally.
Axial motion
The axial feedrates are programmed under address FA and remain valid until an input signal
is present. They act modally.
FMA[2,<axis>]=... to FMA[7,<axis>]=... can be used to program up to six 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
The values programmed under FMA act non-modally. 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[<axis>]=...
SRA[<axis>]=...
The expression in square brackets indicates the axis for which the sparking out time and
retraction path apply.
Examples:
STA[X]=2.5
SRA[X]=3.5
These addresses apply non-modally.
Note
Retraction path
The unit for the retraction path refers to the current valid unit of measurement (mm or inch).
The reverse stroke is always made in the opposite direction to the current motion. SR/SRA
always programs the value for the reverse stroke. No sign is programmed.
Basic Functions
Function Manual, 01/2015, 6FC5397-0BP40-5BA2
Dwell time (for grinding sparking out time)
Retraction path
; Axial feedrate for Y axis, corresponds to input bit 3
Axial dwell time (sparking out time)
Axial retraction path
; The sparking out time for the X axis is 2.5 seconds.
; The retraction path for the X axis is 3.5 (unit e.g. mm).
V1: Feedrates
17.4 Feedrate control
1345

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