HEIDENHAIN PROFIBUS-DP (DPV2) - Manual (Page 37)

PROFIBUS IO data description
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5 PROFIBUS IO data description
5.1 Encoder profile for PROFIBUS version 4.1
The functionality of this profile is divided in two application
classes, Class 3 and
Class 4. The use of the name application class is new in this
profile and conforms to the Encoder class in the DPV0 profile.
For further information regarding the encoder functionality refer to
the device profile. The profile and PROFIBUS technical information
can be ordered at PNO in Karlsruhe, Germany
(www.profibus.com).
Figure 11 Overview of encoder profiles