Siemens SINUMERIK 840D sl Function Manual page 102

A3: Axis Monitoring, Protection Zones
3.2 Axis monitoring functions
System variables
You can implement customized error reactions using the following system variables:
System variable
$VA_ENC_ZERO_MON_ERR_CNT[<n>,<axis>]
$VA_ABSOLUTE_ENC_DELTA_INIT[<n>,<axis>]
<n>: Encoder number
<axis>: Axis name
102
Meaning
Number of detected limit value violations.
Contains the current number of detected limit value violations
when comparing the absolute and the incremental encoder
tracks.
The value is reset to 0 at:
● POWER ON
● Selection/deselection of parking
Reset does not cause a reset.
Initial difference for absolute encoders.
Contains the initial difference between the last buffered absolute
position in the static NC memory and the current absolute posi‐
tion.
Format of the difference value: Number of internal increments
(see MD10200 $MN_INT_INCR_PER_MM or MD10210
$MN_INT_INCR_PER_DEG)
The value is updated at:
● POWER ON
● Warm restart
● Deselection of parking
● Return below the encoder limit frequency
There is no reset at reset.
Function Manual, 01/2015, 6FC5397-0BP40-5BA2
Basic Functions