Block Search In Connection With Other Nck Functions; Asub After And During Block Search - Siemens SINUMERIK 840D sl Function Manual

K1: Mode group, channel, program operation, reset response
9.7 Block search, types 1, 2, and 4:
Single block
If you do not wish to stop after each action block after the search target during block search
type 2 or type 4 (block search with calculation to ...) is found and while function "Single block"
(DB21, ... DBX0.4 == 1 (activate single block)) is active, this behavior can be deactivated in
machine data:
MD10702 $MN_IGNORE_SINGLEBLOCK_MASK, Bit 3 = 1 (ignore signal block for action
blocks)
Interface signal "start block active"
The interface signal is only set during block search type 2 (block search with calculation to
contour):
● DB21, ... DBX32.4 = 1 (approach block active)
For block search type 4 (block search with calculation to block end point), the interface signal
is not set because no approach block is generated here (approach block equal to target block).
Type of interpolation of the target block
For a block search type 4 (block search with calculation to block end point), the start movement
is performed in the interpolation type valid in the target block. For interpolation types other than
linear interpolation (G0 or G1), the start movement can be canceled with an alarm (e.g. circle
end point error in circular interpolation G2 or G3).
9.7.2

Block search in connection with other NCK functions

9.7.2.1

ASUB after and during block search

Block search type 2 and type 4: Synchronization of the channel axes
If an ASUP is started after a block search type 2 or type 4 (block search with calculation to ...)",
the actual positions of all channel axes are synchronized.
Effect
If the following system variables are read in the ASUP, they contain the following values:
● $P_EP: Current actual position of the channel axis in the WCS
● $AC_RETPOINT: Collected block search position of the channel axis in the WCS
Block search type 2: ASUP completion
For block search type 2 (block search with calculation to contour), the following command
REPOSA (reapproach to the contour; linear; all channel axes) must be programmed by
completion of the ASUP.
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Function Manual, 01/2015, 6FC5397-0BP40-5BA2
Basic Functions