Siemens SINUMERIK 840D sl Function Manual page 398

H2: Auxiliary function outputs to PLC
8.2 Predefined auxiliary functions
Bit Meaning
2 No predefined auxiliary function
A predefined auxiliary function is treated like a user-defined auxiliary function with this setting. The auxiliary function
then no longer triggers the corresponding system function but is only output to the PLC.
Example:
Reconfiguration of the "Position spindle" auxiliary function (index 9) to a user-defined auxiliary function with normal
acknowledgment and output prior to the traversing motion.
MD22080 $MC_AUXFU_PREDEF_SPEC [ 9 ] = 'H25' (100101B)
3 No output to the PLC
The auxiliary function is not output to the PLC.
4 Spindle response after acknowledgement by the PLC
The associated system function is only executed after acknowledgment by the PLC.
5 Output prior to motion
The auxiliary function is output to the PLC before the traversing motions programmed in the part program block (path
and/or block-related positioning axis movements).
6 Output during motion
The auxiliary function is output to the PLC during the traversing motions programmed in the part program block (path
and/or block-related positioning axis movements).
7 Output at block end
The auxiliary function is output to the PLC after the traversing motions programmed in the part program block have
been completed (path and/or block-related positioning axis movements).
8 Not output after block search, types 1, 2, 4
Block search, types 1, 2, 4: The auxiliary function collected during the block search is not output.
9 Collection during block search with program test (type 5, SERUPRO)
For a block search with program test, the auxiliary function is collected group-specific in the following system variables:
● $AC_AUXFU_M_VALUE[<n>]
● $AC_AUXFU_M_EXT[<n>]
● $AC_AUXFU_M_STATE[<n>]
10 No output during block search with program test (type 5, SERUPRO)
For block search with program test, the auxiliary function is not output to the PLC.
11 Cross-channel auxiliary function (SERUPRO)
For block search with program test (SERUPRO), the help function is collected on a cross-channel basis in the global
list of the auxiliary functions.
Note
For each auxiliary function group, only the last auxiliary function of the group is always collected.
12 Output performed via synchronized action (read only)
The bit is set if the auxiliary function was output to the PLC via a synchronized action.
13 Implicit auxiliary function (read-only)
The bit is set if the auxiliary function was implicitly output to the PLC.
14 Active M01 (read only)
The bit is set if the auxiliary function, for active M01, was output to the PLC.
15 No output during positioning test run
During the run-in test, the auxiliary function is not output to the PLC.
16 Nibbling off
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Function Manual, 01/2015, 6FC5397-0BP40-5BA2
Basic Functions