Siemens SINUMERIK 840D sl, Function Manual

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Detailed description
2.3 Feedrate control
Basic logic functions: Feeds (V1)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0
51
Empty blocks
When chamfer or rounding is active, the possible number of blocks containing no traversing
information is limited.
The maximum number is defined in machine data:
MD20200 CHFRND_MAXNUM_DUMMY_BLOCKS.
The possible blocks without traversing information in the compensation plane are pure
dummy commands and are called empty blocks. For this reason, they may only be written
between two blocks with traversing information.
Constraints
• Feedrate interpolation
FLIN
and
FCUB
is not possible for chamfer/rounding.
•
FRC
/
FRCM
has no effect if a chamfer is being machined with
G0
; the command can be
programmed according to the
F
value without error message.
•
FRC
is only effective if a chamfer/rounding is programmed in the same block or if
RNDM
has been activated.
•
FRC
overwrites the
F
or
FRCM
value for chamfer/rounding in the current block.
•
FRC
/
FRCM
must be set to a value greater than zero.
•
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.