Siemens Simatic S7-1500 Manual page 156

Parameter data records
B.3 Structure of a data record for output channels of the analog on-board I/O
Data record structure
The figure below shows the structure of data record 64 for channel 0 as an example. The
structure is identical for channel 1. The values in byte 0 and byte 1 are fixed and must not be
changed.
You enable a parameter by setting the corresponding bit to "1".
Figure B-3
156
Structure of data record 64: Bytes 0 to 7
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Manual, 09/2016, A5E35306440-AB