Byte
Bit
Meaning
Byte 8
7
Channel error 15
6
Channel error 14
5
...
4
...
3
...
2
...
1
Channel error 9
0
Channel error 8
Bytes 9 to 24 of the SM 431; AI 16 x 16 bit
Data record 1 contains the channel-specific diagnostic data, starting at bytes 9 to 24. The figure
below shows the assignment of the diagnostic byte for a channel of the module.
Table B-20
Diagnostic byte for a channel of the SM 431; AI 16 x 16 bit
Byte
Bit
Meaning
Byte 9-24
7
Overflow
6
Underflow
5
Reference channel error
4
Wire break
3
Short-circuit to M
2
0
1
0
0
Configuring/parameter assignment error
Bytes 2 and 3 of the SM 431; AI 8 x RTD x 16 bit
Table B-21
Bytes 2 and 3 of the diagnostic data of the SM 431; AI 8 x RTD x 16 bit
Byte
Bit
Meaning
Byte 2
7
0
6
0
5
0
4
0
3
0
2
Operating mode 0: RUN; 1: STOP
1
0
0
0
Diagnostic data of signal modules
B.5 Diagnostic data of the analog input modules as of byte 2
S7-400 Automation System Module Data
422
Reference Manual, Ausgabe 11/2016, A5E00850736-08