Siemens sinumerik 840d Programming Manual page 175

04.00
5
5.6 Measurements with touch trigger probe, MEAS, MEAW
840D 840D
NCU 571 NCU 572
NCU 573
Measuring job status
Status variable $AC_MEA[n] (n= number of probe)
can be scanned if the switching state of the touch
trigger probe needs to be evaluated in the program:
0 Measuring job not performed
1 Measuring job successfully completed
(probe has switched state)
If the probe is deflected during program execution,
this variable is set to 1. At the beginning of a
measurement block, the variable is automatically set
to correspond to the starting state of the probe.
Programming measuring blocks, MEAS, MEAW
When command MEAS is programmed in
conjunction with an interpolation mode, actual
positions on the workpiece are approached and
measured values recorded simultaneously. The
distance-to-go between the actual and setpoint
positions is deleted.
The MEAW function is employed in the case of
special measuring tasks where a programmed
position must always be approached.
MEAS and MEAW are programmed in a block with
motion commands. The feeds and interpolation
types (G0, G1, ...) must be selected to suit the
measuring task in hand; this also applies to the
number of axes.
Example:
N10 MEAS=1 G1 F1000 X100 Y730 Z40
Measurement block with probe at first measuring
input and linear interpolation. A preprocessing stop
is automatically generated.
 Siemens AG 2000. All rights reserved
SINUMERIK 840D/840Di/810D/FM-NC Programming Guide Advanced (PGA) − 04.00 Edition
810D 840Di
CCU 2
Special Motion Commands
5
5-175