HEIDENHAIN PROFIBUS-DP (DPV0) - Manual (Page 6)

General information
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1 General information
This manual describes the installation procedures and
configuration of HEIDENHAIN absolute encoders and encoder
gateways with PROFIBUS DPV0 functionality.
1.1 Encoder gateway
The advantages of the gateway concept is that it allows the use
of small and very robust EnDat encoders, which make the
encoder gateway solution suitable in applications where very high
ambient temperature is a limiting factor.
Another benefit with the gateway solution is that in case of an
encoder error occurs, the EnDat encoder can easily be replaced
without the need to disconnect the PROFIBUS line. The encoder
gateway supports singleturn encoders with up to 31 bit resolution
and multiturn encoders with up to 37 bits resolution with the
limitations described in this manual.
1.2 Absolute encoders
With an absolute encoder each angular position is assigned a
coded position value generated by a code disc equipped with
several parallel fine graduations tracks which are scanned
individually. On singleturn encoders, i.e. an encoder producing
absolute positions within one revolution, the absolute position
information repeats itself with every revolution. So called multiturn
encoders can also distinguish between revolutions. The numbers
of unique revolutions is determined by the resolution of the
multiturn scanning and repeats itself after the total resolution is
reached.