Siemens SINUMERIK 808D Parameter Manual page 225

Note:
This MD is changed internally by the control during traversing movements. Loading a
previously saved MD data block can therefore destroy the encoder calibration (machine
position reference) of absolute encoders.
For software conversions, we recommend removing the MD data block from the old
software release prior to conversion and reloading it into the new software release
without moving any axis in the meantime. Protection level 1 should be set for SW 3.6;
protection level 2
explicitly verified (controlled, calibrated) after the software conversion.
30260 ABS_INC_RATIO
- Absolute encoder: Ratio of absolute to incremental resolution
-
808d-me42 1
808d-me62 1
808d-te42 1
808d-te62 1
808d-mte40 1
808d-mte60 1
Description:
Absolute track resolution in relation to the incremental signal resolution.
This MD only applies for absolute encoders:
-
Absolute information XIST2 related to incremental information XIST1.
In the case of plausible drive parameters (e.g. in PROFIdrive parameter P979) the
value of this MD is automatically calculated and updated from drive parameters (if
parameter read-out has not been deactivated with MD13070 $MN_DRIVE_FUNCTION_MASK, bit2)
Implausible drive parameters (e.g. multiplication of absolute track higher than that
of the incremental signal) are rejected and replaced by the value entered in the
current MD.
Implausible input values in the current MD (e.g. value=0) are reset to the default
value. In addition, alarm 26025 or 26002 is output to inform the user accordingly.
30270 ENC_ABS_BUFFERING
- Absolute encoder: Traversing range extension
-
808d-me42 1
808d-me62 1
808d-te42 1
808d-te62 1
808d-mte40 1
808d-mte60 1
Description:
This MD defines the way in which the absolute encoder position is buffered, and whether
a traversing range extension is active on software side (exceeding the limits of the
absolute value encoder range that can be displayed on the hardware).
"0" = standard = traversing range extension (compare ACT_POS_ABS) is active.
"1" = traversing range extension on software side is inactive.
When using an absolute linear scale, there will not be a traversing range overflow for
mechanical reasons. This MD is therefore only valid for rotary absolute value encoders.
Parameter Manual
List Manual, 01/2017
suffices for SW 4 and higher. The encoder calibration must be
4, 4
4, 4
4, 4
4, 4
4, 4
4, 4
PROFIBUS drives:
0, 0
0, 0
0, 0
0, 0
0, 0
0, 0
EXP, A01, A02
DWORD
0 -
0 -
0 -
0 -
0 -
0 -
EXP, A01, A02
BYTE
0 1
0 1
0 1
0 1
0 1
0 1
Machine data
3.4 Axis-specific machine data
-
PowerOn
0/0 S
0/0 S
0/0 S
0/0 S
7/2 M
7/2 M
R1
PowerOn
0/0 S
0/0 S
0/0 S
0/0 S
7/2 M
7/2 M
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