Siemens S7-1500 Manual page 34

Parameter data records
B.2 Structure of the parameter data records
Data record structure
The figure below shows the structure of data record 0 for channel 0 as an example. The
structure is identical for channels 1 to 15. 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
34
Structure of data record 0: Bytes 0 to 3
Digital input module DI 16x24...125VUC HF (6ES7521-7EH00-0AB0)
Manual, 12/2016, A5E35681478-AC