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