HEIDENHAIN PWM 20 - Manual (Page 61)

62 HEIDENHAIN ATS Software User's Manual
Absolute position [bits] display
The displayed value is the position value transferred from the encoder (1:1 display of the
transferred data without any conversion).
The absolute encoder position is displayed as binary value.
Position 1 represents bit 1 which is the LSB (Least Significant Bit) of the position value.
The bit length may vary and depends on the connected encoder.
Example: Rotary encoder with 37 bits
Datum shift Customer-specific datum shift can be performed with EnDat encoders.
This serves to adapt the encoder (e.g. to capture the rotor position of a synchronous motor) to
the machine/motor individually for each axis.
The counting direction for the incremental positions is reversed.
For certain encoders (e.g. SSI rotary encoders) the counting direction of the
incremental counters can be programmed; the ATS software can be adjusted
for parallel measurement.
Note
If you want to repeat (e.g. correct) the datum shift, the current datum shift must be canceled
first!
Attention
The datum shift can only be performed correctly while the encoder is in standstill.
DANGER
An incorrectly set datum (with synchronous motors: field angle) can lead to undesirable
reactions of the motor, including uncontrollability. It might even move in the wrong
direction!
Ensure that vertical or hanging axes cannot fall!
Please contact the machine manufacturer or HEIDENHAIN, if you have any questions.