Siemens SINUMERIK 840D sl Programming Manual page 264

Special motion commands
4.8 Axial measurement (MEASA, MEAWA, MEAC) (option)
$AA_MM3[<axis>]
$AA_MM4[<axis>]
System variables
The probe status is available in the following system variables:
$A_PROBE[<n>]
Value
1
0
The probe limitation is available in the following system variables:
$A_PROBE_LIMITED[<n>]
Value
1
0
<n> = probe
Reference:
Parameter Manual, System Variables
Measuring job status for MEASA, MEAWA
If an evaluation is required in the program, the measuring task status can be queried via
$AC_MEA[<n>], where <n> = number of the probe. Once all the trigger events of probe <n>
that are programmed in a block have occurred, this variable returns a value of "1".
Otherwise, its value is 0.
Note
If measurement is started from synchronized actions, $AC_MEA is no longer updated. In this
case, the new PLC interface signal DB31, ... DBX62.3 or the equivalent variable
$AA_MEAACT[<axis>] must be queried.
Meaning:
$AA_MEAACT==1: Measurement active
$AA_MEAACT==0: Measurement not active
264
or
or
Meaning
Probe deflected
Probe not deflected
Meaning
Probe limitation active
Probe limitation inactive
$AA_MW3[<axis>]
$AA_MW4[<axis>]
Programming Manual, 03/2013, 6FC5398-2BP40-3BA1
Measured value from measuring
system 1 on trigger event 2
Measured value from measuring
system 2 on trigger event 2
Job Planning