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 suffices for SW 4 and higher. The encoder calibration must be
explicitly verified (controlled, calibrated) after the software conversion.
30260 ABS_INC_RATIO EXP, A01, A02 -
- Absolute encoder: Ratio of absolute to incremental resolution DWORD PowerOn
-
808d-me42 1 4, 4 0 - 0/0 S
808d-me62 1 4, 4 0 - 0/0 S
808d-te42 1 4, 4 0 - 0/0 S
808d-te62 1 4, 4 0 - 0/0 S
808d-mte40 1 4, 4 0 - 7/2 M
808d-mte60 1 4, 4 0 - 7/2 M
Description: Absolute track resolution in relation to the incremental signal resolution.
This MD only applies for absolute encoders:
- PROFIBUS drives:
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 EXP, A01, A02 R1
- Absolute encoder: Traversing range extension BYTE PowerOn
-
808d-me42 1 0, 0 0 1 0/0 S
808d-me62 1 0, 0 0 1 0/0 S
808d-te42 1 0, 0 0 1 0/0 S
808d-te62 1 0, 0 0 1 0/0 S
808d-mte40 1 0, 0 0 1 7/2 M
808d-mte60 1 0, 0 0 1 7/2 M
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.
Machine data
3.4 Axis-specific machine data
Parameter Manual
List Manual, 01/2017 225
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