Siemens SINUMERIK 840D sl Programming Manual page 304

Special motion commands
4.8 Extended measuring function (MEASA, MEAWA, MEAC) (option)
Geometry axes/Transformations
If axial measurement is to be started for a geometry axis, the same measuring job must be
programmed explicitly for all remaining geometry axes. The same applies to axes involved in
a transformation.
Example:
N10 MEASA[Z]=(1,1) MEASA[Y]=(1,1) MEASA[X]=(1,1) G0 Z100
or
N10 MEASA[Z]=(1,1) POS[Z]=100
Measurement job with two measuring systems
If a measuring job is executed by two measuring systems, each of the two possible trigger
events of both measuring systems of the relevant axis is acquired. The assignment of the
reserved variables is therefore preset:
$AA_MM1[<axis>]
$AA_MM2[<axis>]
$AA_MM3[<axis>]
$AA_MM4[<axis>]
Probe status
The probe status is available in the following system variables:
$A_PROBE[<n>]
<n>=probe
Value
1
0
304
or
or
or
or
Significance
Probe deflected
Probe not deflected
$AA_MW1[<axis>]
$AA_MW2[<axis>]
$AA_MW3[<axis>]
$AA_MW4[<axis>]
Programming Manual, 06/2009, 6FC5398-2BP20-0BA0
Measured value from
measuring system 1 on trigger
event 1
Measured value from
measuring system 2 on trigger
event 1
Measured value from
measuring system 1 on trigger
event 2
Measured value from
measuring system 2 on trigger
event 2
Job Planning