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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.
Set datum shift
Attention
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.
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.
Click the symbol.
There are two types of datum shift:
1. EnDat-compliant datum shift
This type considers the relation of datum and signal period (incremental signal).
Note
After the datum shift the absolute datum will not always be exactly the current position.
The ATS program calculates the new datum such that in relation to the incremental signals
its position corresponds to the EnDat specification, i.e. is as close as possible to the desired
position.
Attention
For encoder types "with incremental signals" (interface names EnDat 01 and EnDat 02)
the setting "EnDat-compliant datum shift" must be displayed.
46 HEIDENHAIN ATS Software Operating Instructions