Information Options - Siemens SINUMERIK 840D sl Function Manual

H2: Auxiliary function outputs to PLC

8.15 Information options

Parameterization
The M codes for auxiliary functions to be output implicitly are defined with the machine data:
● MD22530 $MC_TOCARR_CHANGE_M_CODE (M code at toolholder change)
This machine data value indicates the number of the M code which is output when a
toolholder is activated at the NC/PLC interface.
If the value is positive, the unchanged M code is always output.
If the value is negative, the number of the toolholder is added to the machine data value,
and this number is output.
● MD22532 $MC_GEOAX_CHANGE_M_CODE (M code when switching the geometry
axes)
Number of the M code which is output when the geometry axes on the NC/PLC interface
are switched.
● MD22534 $MC_TRAFO_CHANGE_M_CODE (M code in the case of transformation
changes)
Number of the M code which is output during a transformation switch of the geometry axes
at the NC/PLC interface.
Note
No M code is output if the number of the M code being output or the MD22530/MD22532/
MD22534 value is between 0 and 6, or is either 17 or 30. Whether or not an M code which
is generated in this manner leads to conflicts with other functions is not monitored.
Output behavior
In the case of implicitly output auxiliary functions, bit 13 is set in machine data MD22080 or
MD22035 (output behavior of predefined or user-defined auxiliary functions).
This bit can be queried via the system variable $AC_AUXFU_SPEC[<n>].
Implicitly output auxiliary function M19
To achieve uniformity in terms of how M19 and SPOS or SPOSA behave at the NC/PLC
interface, auxiliary function M19 can be output to the NC/PLC interface in the event of SPOS
and SPOSA (see Section "General functionality (Page 1205)").
The implicitly output auxiliary function M19 is collected during the block search.
8.15 Information options
Information about auxiliary functions (e.g. about the output status) is possible via:
● The group-specific modal M auxiliary function display on the user interface
● Querying system variables in part programs and synchronized actions
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Function Manual, 01/2015, 6FC5397-0BP40-5BA2
Basic Functions