Non-Modal Feedrate Fb - Siemens SINUMERIK 828D Function Manual

• FRCM=0 activates the feedrate programmed in F for the chamfer/rounding.
• If FRCM is programmed, the FRCM value must be reprogrammed, equivalent to F, on a G94 ↔ G95 change, etc.
If only F is reprogrammed and FRCM > 0 before the feedrate type is changed, error message 10860 (no
feedrate programmed) appears.
17.4.9

Non-modal feedrate FB

General
A separate feedrate can be specified for a single block with the command FB (Feed Block). The previously active
path feedrate is overwritten for this block. After this block, the previous modal path feedrate is active again.
Function
The non-modal feedrate is programmed with FB=<value>.
The feedrate is interpreted according to the active feedrate type:
G94, G961, G971:
G95, G96, G97:
Boundary conditions
• The programmed value of FB=<value> must be greater than zero.
• If no traversing motion is programmed in the block (e.g.: Computational 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.
• The path speed profile programmed with FLIN or FCUB is not active together with revolutional feedrate for
G95 as well as with constant cutting speed for G96/G961 and G97/G971.
• Feedrate interpolations FLIN, FCUB, .. are also possible without restriction.
• Simultaneous programming of FB and FD (handwheel travel with feed overlay) or F (modal path feedrate) is
not possible.
Basic Functions
Function Manual, 09/2011, 6FC5397-0BP40-2BA0
Feedrate in mm/min or inches/min or
Revolutional feedrate in mm/rev or inch/rev
o
/min
V1: Feedrates
17.4 Feedrate control
1405