30250 ACT_POS_ABS EXP, A02, A08 R1
- Internal encoder position DOUBLE PowerOn
ODLD, -, -
808d-me42 1 0.0, 0.0 - - 1/1
808d-me62 1 0.0, 0.0 - - 1/1
808d-te42 1 0.0, 0.0 - - 1/1
808d-te62 1 0.0, 0.0 - - 1/1
808d-mte40 1 0.0, 0.0 - - 7/2
808d-mte60 1 0.0, 0.0 - - 7/2
Description: The actual position (hardware counter status only without machine reference) is stored
(in internal format display) in this MD.
At power ON (or encoder activation), it acts with:
● Absolute encoders:
To restore the current position (in combination with the position, possibly with
several meanings, buffered in the encoder).
● Incremental encoders:
To buffer the actual value beyond power OFF when the functionality is activated
MD34210 $MA_ENC_REFP_STATE = 1 or. 2 (i.e. as a reference point replacement).
To buffer the actual value beyond power OFF when the functionality is activated
MD34210 $MA_ENC_REFP_STATE = 3 (i.e. as a restored position value).
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
808d-me62 1 4, 4 0 - 0/0
808d-te42 1 4, 4 0 - 0/0
808d-te62 1 4, 4 0 - 0/0
808d-mte40 1 4, 4 0 - 7/2
808d-mte60 1 4, 4 0 - 7/2
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.
Machine data
3.4 Axis-specific machine data
Parameter Manual
212 Parameter Manual, 08/2015, 6FC5397-8EP40-0BA1
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