
Diagnostic data of signal modules
B.5 Diagnostic data of the analog input modules as of byte 2
S7-400 Automation System Module Data
440 Reference Manual, Edition 09/2009, A5E00850736-06
Byte Bit Meaning
7 0
6 Hardware interrupt lost
5 0
4 ADC/DAC error
3 RAM error
2 EPROM error
1 0
Byte 3
0 0
Bytes 4 to 7 of the SM 431; AI 8 x 16 bit
Table B- 26 Bytes 4 to 7 of the diagnostic data of the SM 431; AI 8 x 16 bit
Byte Bit Meaning
7 0
6
5
4
3
2
1
Byte 4
0
Channel type B#16#71: Analog input
7
Byte 5
0
Number of diagnostics bits that the module outputs per channel: 16 bits long
7
Byte 6
0
Number of channels of the same type in one module: 8 channels
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