Siemens SINUMERIK 840Di sl - Blockwise Feed (FB

Feedrate Control and Spindle Motion
7.15 Blockwise feed (FB...)
Fundamentals
Programming Manual, 11/2006, 6FC5398-1BP10-2BA0
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7.15 Blockwise feed (FB...)
Function
You can use the function "Non-modal feedrate" to define a separate feedrate for a single
block.
The address FB is used to define the feedrate only for the current block. After this block, the
previously active modal feedrate is active.
Programming
FB=<Wert> Feed motion only in one block
Parameter
FB=...=
Instead of the modal feedrate active in the previous block, you can
program a separate feedrate for this block; in the block that follows,
the previously active modal feedrate applies.
<WERT>
The programmed value of FB=<Wert> must be greater than zero.
Feed value
The address FB is used to define the feedrate only for the current block. After this block, the
previously active modal feedrate is active.
The feedrate is interpreted according to the active feedrate type:
• G94: feedrate in mm/min or degrees/min
• G95: feedrate in mm/rev or inch/rev
• G96: Constant cutting rate
References: /FB1/Function Manual Basic Functions; Feedrates (V1)
Note
If no traversing motion is programmed in the block (e.g., computation block), the FB has no
effect.
If no explicit feed for chamfering/rounding is programmed, then the value of FB also applies
for any contour element chamfering/rounding in this block.
Feedrate interpolations FLIN, FCUB, etc., are also possible without restriction.
Simultaneous programming of FB and FD (handwheel travel with feed overlay) or F (modal
path feedrate) is not possible.
Example