HEIDENHAIN PROFIBUS-DP (DPV2) - Manual (Page 44)

PROFIBUS IO data description
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5.6 Format of G1_XIST3
G1_XIST3 is a 64 bit position value which is used to support
encoders with a resolution exceeding 32 bits.
Format definition for G1_XIST3:
• Binary format
• The actual position value is always right aligned, a shifting
factor is not used.
• The settings in the encoder parameter data affect the position
value in G1_XIST3 if Class 4 is enabled.
IO Data (word) 1 2 3 4
Format 64 bit position value
Table 13 Format of G1_XIST3