Siemens sinumerik 840d Programming Manual page 371

08.97
10
840D
NCU 572
NCU 573
Main program:
%_N_MAIN_MPF
AON
...
G1 X100 F1000
AOFF
M30
Notes
Position offset in the basic coordinate system
With the system variable $AA_OFF[axis] on overlaid
movement of each axis in the channel is possible. It acts as
a position offset in the basic coordinate system.
The position offset programmed in this way is overlaid
immediately in the axis concerned, whether the axis is being
moved by the program or not.
From SW 4 upwards, it is possible to limit the absolute value
to be corrected (real-time variable output) to the variable in
setting data SD 43350: AA_OFF_LIMIT.
The manner of overlaying the distance is defined in machine
data MD 36750: AA_OFF_MODE:
0 Proportional valuation
1 Integrating valuation
With system variable $AA_OFF_LIMIT[axis] a directional
scan to see whether the offset value is within the limits is
possible. These system variables can be scanned from
synchronized actions and, when a limit value is reached, it is
possible to stop the axis or set an alarm.
0 Offset value not within limits
1 Limit of offset value reached in the positive direction
–1 Limit of the offset value reached in the negative
direction
 Siemens AG 2000. All rights reserved
SINUMERIK 840D/840Di/810D/FM-NC Programming Guide Advanced (PGA) – 04.00 Edition
10.4 Actions within synchronized actions
810D 840Di
Motion-Synchronous Action
Clearance control ON
Clearance control OFF
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