Detailed description
2.3 Continuous -path mode
Basic logic functions: Continuouspath Mode, Exact Stop, LookAhead (B1)
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Function Manual, 11/2006, 6FC5397-0BP10-2BA0
•
If a synchronized axis is programmed that was last programmed as a positioning axis or
spindle (initial setting of the special axis is positioning axis), the previous block is ended
at the interpolator end.
•
If the transformation is changed, the block previously processed is terminated with the
active exact-stop criterion.
•
A block is terminated on interpolator end if the following block contains the switchover of
the acceleration profile
BRISK/SOFT
.
For more information about
BRISK
and
SOFT
:
Reference:
/FB1/ Function Manual basic function; acceleration (B2)
•
If the "empty buffer" function is programmed, the previous block is terminated when the
selected exact-stop criterion is reached.
Velocity = 0 in continuouspath mode
Regardless of the implicit exact-stop response, the path motion is braked down to zero
velocity at the end of the block in cases where:
•
Positioning axes have been programmed with syntax
POS
and have a travel time that
exceeds that of the path axes. Block change occurs when the "exact stop fine" of the
positioning axes is reached.
•
The time taken to position a spindle programmed with syntax
SPOS
is longer than the
travel time of the path axes. The block change is carried out when the "exact stop fine" of
the positioning spindle is reached.
•
The current block contains traversing commands for geometry axes and the following
block traversing commands for synchronized axes or, alternatively, the current block
contains traversing commands for synchronized axes and the subsequent block
traversing commands for geometry axes.
•
Synchronization is required
Auxiliary function output during traversal
In continuous-path mode with auxiliary-function output during motion and short traversing
blocks, the path velocity is decelerated prior to PLC acknowledgment of the auxiliary
functions.
The axes are decelerated to standstill respecting the acceleration limits at the end of the
block. At the end of the block acknowledgment is awaited before motion can continue.
Acknowledgment during deceleration
Acknowledgment during deceleration accelerates the velocity back to the programmed path
velocity.
In order to prevent this happening in continuous-path mode, the following machine data can
be used to set a time for the CNC during which the PLC will safely acknowledge the auxiliary
functions for the CNC:
MD10110 $MN_PLC_CYCLE_TIME_AVERAGE (average PLC acknowledgement time)
Summary of Contents for SINUMERIK 840D sl
Page 282: ...Index Basic logic functions Acceleration B2 64 Function Manual 11 2006 6FC5397 0BP10 2BA0 ...
Page 388: ...Basic logic functions Travel to fixed stop F1 Function Manual 11 2006 6FC5397 0BP10 2BA0 52 ...
Page 962: ...Index Basic logic functions Emergency Stop N2 20 Function Manual 11 2006 6FC5397 0BP10 2BA0 ...
Page 1704: ...Constraints Basic logic functions Spindles S1 94 Function Manual 11 2006 6FC5397 0BP10 2BA0 ...
Page 1716: ...Index Basic logic functions Spindles S1 106 Function Manual 11 2006 6FC5397 0BP10 2BA0 ...
Page 1996: ...Index Basic logic functions Tool Offset W1 208 Function Manual 11 2006 6FC5397 0BP10 2BA0 ...
Page 2150: ...Table of contents Basic logic functions Appendix 4 Function Manual 11 2006 6FC5397 0BP10 2BA0 ...
Page 2184: ...Glossary Basic logic functions Appendix 38 Function Manual 11 2006 6FC5397 0BP10 2BA0 ...