Siemens SIMATIC S7-300 Manual page 468

Diagnostics data of signal modules
B.3 Channel -specific diagnostics data, starting at byte 8
Analog input channel of SM 331 modules with diagnostics functions
Figure B-6
Analog output channel of SM 332 modules with diagnostics functions
Figure B-7
B-6
Diagnostics byte for an analog input channel of SM 331 modules with diagnostics
functions
Diagnostics byte for an analog input channel of SM 332 modules with diagnostics
functions
S7-300 Automation System Module data
Manual, 08/2006, A5E00105505-04