Parameter Manual
Operating Instructions, 08/2013, 6FC5397-8EP40-0BA0
191
Machine data
2.3 Channel-specific machine data
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
Description: Number of memory elements available for the arc length function for parame-
terizing 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 accel-
erations.
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 func-
tion also has a constant curvature which results in a smoother progression of
the path velocity, as well as the axis velocities and accelerations.
Values substantially larger than 10 are only practical in exceptional cases.
Not only the value of MD28540 $MC_MM_ARCLENGTH_SEGMENTS but also that of
MD20262 $MC_SPLINE_FEED_PRECISION are crucial for the accuracy.
Description: Bit mask to restore data after cancelation of a simulated program execution.
The following applies:
Bit 0: All frames in the data storage are restored.
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
808d-me62 - 18 0 100000 1/1
808d-te42 - 0, 0, 0, 0, 0, 0, 0, 0... 0 100000 0/0
808d-te62 - 0, 0, 0, 0, 0, 0, 0, 0... 0 100000 0/0
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
808d-me62 - 5 0 100 1/1
808d-te42 - 0, 0, 0, 0, 0, 0, 0, 0... 0 100 0/0
808d-te62 - 0, 0, 0, 0, 0, 0, 0, 0... 0 100 0/0
28560 MM_SEARCH_RUN_RESTORE_MODE C02 K2
- Data restore after simulation DWORD PowerOn
-
- - 0x0, 0x0, 0x0, 0x0,
0x0, 0x0, 0x0, 0x0...
0 0x00000001 1/1
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