HEIDENHAIN PROFIBUS-DP (DPV0) - Manual (Page 29)

Profile overview, DPV0 version 1.1.
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4.1 DPV0 encoder classes
The device can be configured as a class 1 or class 2
PROFIBUS slave device. Class 2 configuration is extended to
optionally access velocity information from the encoder.
CLASS 1
In the CLASS 1 configuration, only input data are assigned.
Depending on the encoder resolution, this is one input data
word (16 bits) or two (32 bits).
The following functions can be performed:
1) Changed direction of counting
(Code sequence)
2) Diagnostic data up to octet 16
Configuration data:
Singleturn Class 1 – 16 Bit: D0hex, 1 input data word,
data consistency
Multiturn Class 1 – 32 Bit: D1hex, 2 input data words,
data consistency
CLASS 2
In the CLASS 2 configuration output data values and input
data words are transferred. Depending on the encoder
resolution, this is one input data word (16 bits) and one output
data word (16 bits) or two input data words (32 bits) and two
output data words (32 bits).
The following functions are available in addition to the class 1
functions:
1) Scaling function
2) Preset Value Function
3) Velocity read-out
4) Extended diagnostic data