Detailed description
2.12 Block search
Basic logic functions: Auxiliary Function Output to PLC (H2)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0
51
Constraints
Collected S values
The meaning of an S value in the parts program depends on the feed type that is currently
active:
G93
,
G94
,
G95
,
G97
,
G971
The S value is interpreted as the speed
G96
,
G961
The S value is interpreted as a constant cutting rate
If the feed operation is changed (e.g. for a tool change) before output of the system variable
$P_SEARCH_S, the original setting from the target block in the parts program must be
restored to avoid use of the wrong type of feed.
Collected direction of rotation
For output of the direction of rotation, the system variable $P_SEARCH_SDIR is assigned
default value "-5" at the start of the block search. This value has no effect on output.
This ensures that the last spindle operating mode is retained for a block search across
program section in which spindles are not programmed with a direction of rotation,
positioning or axis mode.
The programming of
M19
,
SPOS
and
SPOSA
is collected as "
M-19
" (internal
M19
) in the
system variables $P_SEARCH_SDIR alternatively to
M3
,
M4
,
M5
and
M70
.
For the output of "
M-19
", the positioning data are read internally from the system variables
$P_SEARCH_SPOS and $P_SEACH_SPOSMODE. Both system variables can also be
written, for example, to make corrections.
Note
Because of the assignments described above (e.g. M[n] = $P_SEARCH_SDIR[n]), the
values "–5" and "–19" generally remain hidden from the user and only have to be observed in
the case of special evaluation of the system variables in the ASUB.
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 ...