HEIDENHAIN PROFIBUS-DP (DPV0) - Manual (Page 49)

Encoder and Gateway functionality, DPV0
49
5.6.5 Singleturn resolution or measuring step
The singleturn resolution in the diagnostic function has different
meanings depending on the type of encoder.
For rotary or angle encoders, the diagnostic octets 11 to 14
indicate the physical resolution in number of measuring steps per
revolution which is transferred for the absolute singleturn position
value. The maximum singleturn resolution is 2
31
. For linear
encoders the measuring steps is presented with respect to the
resolution of the linear encoder, i.e. each increment of the
measuring step is equal the actual resolution for the linear
encoder in use. Typical values for the linear resolution are
1µm - 40 µm.
DDLM_Slave_Diag
Octet 11 12 13 14
Bits 31-24 23-16 15-8 7-0
Data 2 31 -2 24 2 23 -2 16 2 15 -2 8 2 7 -2 0
Singleturn resolution
Table 25 Diagnostic, singleturn resolution
5.6.6 Number of distinguishable revolutions
The number of distinguishable revolutions that the
encoder can transfer is defined by octets 15 and 16 of
the diagnostic function. In accordance with the formula
below, the measuring range for an encoder results from
the number of distinguishable revolutions multiplied by
the singleturn resolution. The maximum number of
distinguishable revolutions is 65536-1(16 bits).
Measuring range = number of distinguishable revolutions
x singleturn resolution
DDLM_Slave_Diag
Octet 15 16
Bits 15-8 7-0
Number of distinguishable revolutions
Table 26 Diagnostics, number of distinguishable revolutions