Siemens SIMATIC S7-300 Reference Manual page 489

Structure of data record 128
The figure below shows the structure of data record 128 for SM 331;
AI 8 x TC.
Byte 0
Byte 1
Byte 2
Byte 3
Byte 4
Byte 5
Byte 6
Byte 7
Figure A-9
Programmable Logic Controllers S7-300 Module Data
A5E00105505-03
7 6 5 4 3 2
Channel group 1
Channel group 2
Channel group 3
Smoothing, channel group 0 (refer to Table A-18)
Reaction with open thermocouple, channel group 0
(refer to Table A-17)
Smoothing, channel group 1 (refer to Table A-18)
Reaction with open thermocouple, channel group 1
(refer to Table A-17)
Data Record 128 of the SM 331; AI 8 x TC
Parameter Sets for Signal Modules
1 0
Module filtering mode (refer to Table A-14)
Interference suppression
Channel group 0
Measuring method, channel group 0
(refer to Table A-16)
Measuring range, channel group 0
(refer to Table A-16)
Measuring method, channel group 1
(refer to Table A-16)
Measuring range, channel group 1
(refer to Table A-16)
(refer to Table A-15)
A-21