Siemens Sinumerik 840D sl Programming Manual page 280

Special Motion Commands
4.8 Extended measuring function (MEASA, MEAWA, MEAC) (option)
Note
MEASA cannot be programmed in synchronized actions. As an alternative, MEAWA plus the
deletion of distance-to-go can be programmed as a synchronized action.
If the measuring task with MEAWA is started from synchronized actions, the measured values
will only be available in the machine coordinate system.
Measurement results for MEASA, MEAWA
The results of measurements are available under the following system variables:
• In the machine coordinate system:
$AA_MM1[<axis>]
...
$AA_MM4[<axis>]
• In the workpiece coordinate system:
$AA_WM1[<axis>]
...
$AA_WM4[<axis>]
Note
No internal preprocessing stop is generated when these variables are read. A preprocessing
stop must be programmed with STOPRE at the appropriate position in the program. False
values will otherwise be read in.
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
280
Measured value of programmed measuring system on trigger
event 1
...
Measured value of programmed measuring system on trigger
event 4
Measured value of programmed measuring system on trigger
event 1
...
Measured value of programmed measuring system on trigger
event 4
Programming Manual, 02/2011, 6FC5398-2BP40-1BA0
Job planning