Overlaid Movements ($Aa_Off) - Siemens SINUMERIK 828D Function Manual

2.3.17

Overlaid movements ($AA_OFF)

Overlaid movements
The system variable $AA_OFF can be used to specify a position offset in a channel axis
which is traversed immediately:
$AA_OFF[<channel axis>] = <position offset>
The following machine data can be used to set whether the position offset of the system
variable is to be assigned or summed up (integrated):
MD36750 $MA_AA_OFF_MODE, bit 0 = <value>
<value>
0
1
Note
Limitation of the overlay velocity
The maximum permissible velocity with which the position offset can be traversed can be set
via the machine data:
MD32070 $MA_CORR_VELO (axis velocity for overlay)
Limitation
The value of $AA_OFF can be limited via the following setting data:
SD43350 $SA_AA_OFF_LIMIT (upper limit of the offset value $AA_OFF in case of clearance
control)
The status of the limitation can be read via the following system variable:
$AA_OFF_LIMIT[<axis>] == <value>
Value
-1
1
0
Synchronized actions
Function Manual, 07/2012, 6FC5397-5BP40-3BA0
Meaning
Assignment: $AA_OFF = <position offset>
Sum (integration): $AA_OFF += <position offset>
Meaning
Offset value is limited in the negative direction
Offset value is limited in the positive direction
No limitation of the offset value
2.3 System variables for synchronized actions
Detailed description
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