B1: Continuouspath Mode, Exact Stop, LookAhead
3.3 Continuous-path mode
Basic Functions
Function Manual, 09/2011, 6FC5397-0BP40-2BA0
175
Example:
Limiting velocity characteristics, whereby:
- Override = 50 %, 100 % or 150 %
- Number of LookAhead blocks = 4
- MD20430 $MC_LOOKAH_NUM_OVR_POINTS = 2
- MD20440 $MC_LOOKAH_OVR_POINTS = 1.5, 0.5
- MD20400 $MC_LOOKAH_USE_VELO_NEXT_BLOCK = 1
A combination of both procedures (determination of following block velocity and determination of override points)
can be used to calculate the velocity profiles and is generally advisable because the preset machine data for
these functions already takes the widest range of override-dependent velocity limits into account.
Relief factor with block cycle problems
Block cycle problems are encountered in cases where the traversing distances of the NC blocks to be processed
are so short that the LookAhead function has to reduce the machine velocity to provide enough time for block
processing. In this situation, constant braking and acceleration of path motion may occur.
Velocity fluctuations of this type can be dampened by specifying a relief factor:
MD20450 $MC_LOOKAH_RELIEVE_BLOCK_CYCLE (relieving factor for the block cycle time)
Note
If neither of the procedures has been activated, the setpoint velocity is always applied in the
current block.
Note
Plannable velocity limits restrict override-specific velocity limits.
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Содержание SINUMERIK 828D Turning
Страница 34: ...Basic Functions 34 Function Manual 09 2011 6FC5397 0BP40 2BA0 ...
Страница 146: ...A3 Axis Monitoring Protection Zones 2 6 Data lists Basic Functions 146 Function Manual 09 2011 6FC5397 0BP40 2BA0 ...
Страница 328: ...F1 Travel to fixed stop 6 5 Data lists Basic Functions 328 Function Manual 09 2011 6FC5397 0BP40 2BA0 ...
Страница 816: ...K2 Axis Types Coordinate Systems Frames 10 9 Data lists Basic Functions 816 Function Manual 09 2011 6FC5397 0BP40 2BA0 ...
Страница 1198: ...P4 PLC for SINUMERIK 828D 14 6 Function interface Basic Functions 1198 Function Manual 09 2011 6FC5397 0BP40 2BA0 ...
Страница 1752: ...Appendix 20 2 Overview Basic Functions 1752 Function Manual 09 2011 6FC5397 0BP40 2BA0 ...
Страница 1774: ...Glossary Basic Functions 1774 Function Manual 09 2011 6FC5397 0BP40 2BA0 ...