Siemens Simatic S7-400 - Page 426

Byte Bit Meaning
Byte 6 7 Number of channels of the same type in one module: 8 channels
0
Byte 7 7 Channel error 7
6 Channel error 6
5 ......
4 ......
3 ......
2 ......
1 Channel error 1
0 Channel error 0
Bytes 8 to 23 of the SM 431; AI 8 x 16 bit
Data record 1 contains the channel-specific diagnostic data, starting at bytes 8 to 23. The
following table shows the assignment of the even diagnostic bytes (bytes 8, 10, to 22) for a
channel of the module.
Table B-27 Even diagnostic byte for a channel of the SM 431; AI 8 x 16 bit
Byte Bit Meaning
Bytes 8-23
even
7 Overflow
6 Underflow
5 Reference channel error
4 Wire break
3 0
2 0
1 0
0 Configuring/parameter assignment error
Diagnostic data of signal modules
B.5 Diagnostic data of the analog input modules as of byte 2
S7-400 Automation System Module Data
426 Reference Manual, Ausgabe 11/2016, A5E00850736-08