Siemens SIMATIC S7-300 Manual page 461

Structure of data record 1
The figure below shows the structure of data record 1 for the parameters of analog IO
modules.
You enable a parameter by setting a logic "1" at the corresponding bit of byte 0.
Figure A-22
S7-300 Automation System Module data
Manual, 08/2006, A5E00105505-04
Data record 1 for the parameters of analog IO modules
Parameter sets of signal modules
A.11 Parameters of analog IO modules
A-41