HEIDENHAIN IK-115 - Manual (Page 30)

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Diagnosis during initial operation
By selecting [ Encoder > Commissioning diagnosis ], a
diagnostic routine is run with the encoder. The commissioning
diagnosis checks the function of elementary encoder
components such as illumination, photocells, and triggers.
Whether an encoder supports the commissioning diagnosis is
indicated by word 31 in the memory area for the encoder
manufacturer.
The commissioning diagnosis must be run only when the
encoder is not in motion. Also, the position value updating
must be activated to enable the commissioning
diagnosis.
MSB mode
Selecting [ Encoder > MSB mode] activates the MSB mode
(Most Significant Bit). Now pin 3 of the X3 connection outputs
the TTL level of bit 13 (value: 2
12
= 4096) of the position value.
This signal can be used to adjust an EnDat rotary encoder to the
rotor position of a synchronous motor.
This function is available only for EnDat encoders.
As an alternative, the datum shift function can be used
to adjust the absolute zero position to the motor
commutation.