Siemens SINUMERIK 840D sl Function Manual page 1778

Supplementary conditions
3.2 Supplementary conditions for feedrate programming
Activation of the F values
Machine data:
MD22140 F_VALUES_ACTIVE_AFTER_RESET (F function active via RESET)
can be used to define whether the following most recently programmed F values are to
remain active following a RESET.
• Programmed path feedrate: F=...
• Programmed feedrate change for path feedrate: OVR=...
• Programmed positioning feedrate: FA=...
• Programmed feedrate change for positioning feedrate: OVRA[U]=...
For more detailed information about syntax, please see:
References:
/PG/ Programming Guide, Fundamentals
Position spindle
If G95,G96,G961,G97,G971,G33,G34,G35 is active, spindle positioning should not be
performed, because the derived path feedrate following spindle positioning = 0.
⇒ If the programmed axis position has not yet been reached, the block cannot be completed.
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Basic logic functions: Feeds (V1)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0