Siemens SIMATIC S7-1500 Manual page 36

Data record structure
The example in the following figure shows the structure of data record 64 for channel 0. The
structure of channels 1 to 3 is identical. The values in byte 0 and byte 1 are fixed and may
not be changed.
Enable a parameter by setting the corresponding bit to "1".
Figure B-1
Analog output module AQ 4xU/I ST (6ES7532-5HD00-0AB0)
Manual, 07/2014, A5E03484696-AC
B.1 Parameter assignment and structure of the parameter data records
Structure of data record 64: Bytes 0 to 7
Parameter data records
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