Siemens SINUMERIK 840D sl Function Manual page 542

Detailed description
2.13 Scan and display of output M-auxiliary functions
2.13.1.2 Programming a status check
System variables
System variables are available for the status check of group-specific, modal M-auxiliary
functions.
The following variables can be used to scan M-auxiliary functions on a group-specific basis
in the part program and via synchronous actions. The requirements and conditions described
in "Status display on user interface" are applicable.
• Value of the collected or output M auxiliary function of the n+1 group:
• Address extension of the collected or output M auxiliary function of the n+1 group:
• Output status of the M auxiliary function of the n+1 group:
Example
All M-auxiliary functions of the 1st group will be stored in the order they were output.
id=1 every $AC_AUXFU_M_STATE[0] == 2 do $AC_FIFO[0,0] = $AC_AUXFU_M_VALUE[0]
Additional information on the system variables can be found in:
Reference
/PGA1/ Lists of System Variables.
54
INT $AC_AUXFU_M_VALUE[n]
INT $AC_AUXFU_M_EXT[n]
INT $AC_AUXFU_M_STATE[n]
0: No auxiliary function
1: M-auxiliary function was collected via a search
2: M-auxiliary function has been output to the PLC
3: M-auxiliary function has been output to the PLC and the transport acknowledgement
has taken place.
4: M-auxiliary function is managed by the PLC and has been applied by the PLC.
5: M-auxiliary function is managed by the PLC, and the function acknowledgement has
taken place.
Basic logic functions: Auxiliary Function Output to PLC (H2)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0