HEIDENHAIN PROFIBUS-DP (DPV0) - Manual (Page 28)

Profile overview, DPV0 version 1.1.
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4 Profile overview, DPV0 version 1.1.
The operating function in this profile is divided into two device
classes named Class 1 and Class 2. Class 1 encoders offer basic
functions that all PROFIBUS-DP encoders must support.
Encoders of Class 2 must support all functions of Class 1 as well
as the additional functionality of Class 2. In addition to the two
classes, parameters and diagnostic ranges are reserved for
manufacturer-specific functions.
For further information regarding the encoder functionality refer to
the device profile. The profile and PROFIBUS technical information
can be ordered from www.profibus.com .
Figure 12 Overview encoder profile and related documents