Parameter Manual
Operating Instructions, 08/2013, 6FC5397-8EP40-0BA0
197
Machine data
2.4 Axis-specific machine data
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 acti-
vated 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 acti-
vated 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 soft-
ware 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.
30250 ACT_POS_ABS EXP, A02, A08 R1
- Internal encoder position DOUBLE PowerOn
ODLD, -, -
- 1 0.0, 0.0 - - 1/1
Siemens Controls
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