The following values are recommended:
3: for G643 and G644, if only geometry axes are traversed
5: for G643 and G644, if geometry and rotary axes are traversed
5: for COMPCAD
5: for dyn. transformation
A value that is too low this may lead to additional velocity limitations if a
sufficient number of blocks cannot be made available for interpolation.
MD28530 $MC_MM_PATH_VELO_SEGMENTS additionally increases the memory requirement of
dyn. Look Ahead. Values higher than 5 are only practical in exceptional cases.
3 ... 5 :
Recommended setting.
28533 MM_LOOKAH_FFORM_UNITS C02 -
- Memory for extended LookAhead DWORD PowerOn
-
808d-me42 - 0, 0, 0, 0, 0, 0, 0, 0... 0 100000 0/0 S
808d-me62 - 18 0 100000 1/1 M
808d-te42 - 0, 0, 0, 0, 0, 0, 0, 0... 0 100000 0/0 S
808d-te62 - 0, 0, 0, 0, 0, 0, 0, 0... 0 100000 0/0 S
808d-mte40 - 0, 0, 0, 0, 0, 0, 0, 0... 0 100000 0/0 S
808d-mte60 - 0, 0, 0, 0, 0, 0, 0, 0... 0 100000 0/0 S
Description: The machine data is used to configure the work memory for extended LookAhead.
The MD scales the value defined internally through MD28060 $MC_MM_IPO_BUFFER_SIZE,
MD28520 $MC_MM_MAX_AXISPOLY_PER_BLOCK, MD28530 $MC_MM_PATH_VELO_SEGMENTS, MD28535
$MC_MM_FEED_PROFILE_SEGMENTS, MD28540 $MC_MM_ARCLENGTH_SEGMENTS).
Its practical size depends on the part program, the block lengths, the axis dynamics,
and an active kinematic transformation.
The MD should only be set for those channels in which free-form surfaces are also
machined.
0 : default LookAhead is active.
> 0 : extended LookAhead is active if switched on by MD20443 $MC_LOOKAH_FFORM.
The guide value for free-form surface applications is: 18..20
28540 MM_ARCLENGTH_SEGMENTS C02 B1
- Number of memory elements for arc length function representation DWORD PowerOn
-
808d-me42 - 0, 0, 0, 0, 0, 0, 0, 0... 0 100 0/0 S
808d-me62 - 5 0 100 1/1 M
808d-te42 - 0, 0, 0, 0, 0, 0, 0, 0... 0 100 0/0 S
808d-te62 - 0, 0, 0, 0, 0, 0, 0, 0... 0 100 0/0 S
808d-mte40 - 0, 0, 0, 0, 0, 0, 0, 0... 0 100 0/0 S
808d-mte60 - 0, 0, 0, 0, 0, 0, 0, 0... 0 100 0/0 S
Description: Number of memory elements available for the arc length function for parameterizing
polynomials.
If this machine data is equal to zero, a fixed interval division is used to represent
the arc length function. In this case, the calculated function is only tangent-
continuous. This can lead to discontinuities in the axis accelerations.
If the function G643 or G644 is used for smoothing and/or COMPCAD, this MD should be
assigned a value of at least 10. In this case, the calculated function also has a
constant curvature which results in a smoother progression of the path velocity, as
well as the axis velocities and accelerations.
Machine data
3.3 Channel-specific machine data
Parameter Manual
Parameter Manual, 08/2015, 6FC5397-8EP40-0BA1 207
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