Skip Part Program Blocks (Skp) - Siemens SINUMERIK 808D Function Manual

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● "Last action block active" (DB3300.DBX0000.6)
Chronological order of interface signals:
After "Block search with calculation at block end point", automatic repositioning is not performed between "Last action block
active" and continuation of part program processing by NC Start. The start point of the approach movement is the current
axis position on NC Start; the end point results from the processing of the part program.
Action blocks
Action blocks contain the actions accumulated during "block search with calculation", e.g. auxiliary function outputs, and tool
(T, D), spindle (S) and feed programming commands.
During "block search with calculation" (contour or block end point), actions such as M function outputs are accumulated in
so-called "action blocks". These blocks are output on an NC Start after "Search target found".
Note
The action blocks also activate the accumulated spindle programming (S value, M3/M4/M5, SPOS). The PLC user program
must ensure that the tool can be operated and, if necessary, the spindle programming is reset via the IS "Spindle reset"
(DB380x.DBX0002.2).
PLC actions after block search
There is the IS "Last action block active" to enable activation of PLC actions after block search. The signal indicates that all
action blocks have been executed and it is now possible to perform PLC actions or operator actions (e.g. mode change).
This allows the PLC to perform another tool change, for example, before the start of the movement.
The alarm 10208 is also output per default at this time. It should indicate to the operator that an NC start is still necessary to
continue program processing.
Supplementary condition
The approach movement "Search with calculation to block end point" is performed using the type of interpolation valid in the
target block. This should be G0 or G1, as appropriate. With other types of interpolation, the approach movement can be
aborted with an alarm (e.g. circle end point error on G2/G3).
Note
For further information about the block search function, refer to the SINUMERIK 808D/SINUMERIK 808D ADVANCED
Programming and Operating Manual.
10.4.6

Skip part program blocks (SKP)

Functionality
When testing or breaking in new programs, it is useful to be able to disable or skip certain part program blocks during
program execution.
Function Manual
96
01/2017

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