Siemens SIMATIC ET 200MP Manual page 28

Parameter data records
B.1 Parameter assignment and structure of the parameter data records
Data record structure
The example in the following figure shows the structure of data record 0 for channel 0.
The structure of channels 1 to 15 is identical. The values in byte 0 and byte 1 are fixed
and may not be changed.
Activate a parameter by setting the corresponding bit to "1".
Figure B-1
28
Structure of data record 0: Bytes 0 to 3
DI 16x24VDC HF Digital Input Module (6ES7521-1BH00-0AB0)
Manual, 01/2013, A5E03485952-01