Siemens SIMATIC S7-400 Reference Manual page 424
Automation system module
data
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Diagnostic data of signal modules
B.5 Diagnostic data of the analog input modules as of byte 2
Byte 7
Bytes 8 and 23 of the SM 431; AI 8 x RTD 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-23
Byte 8-23
even
The following table shows the assignment of the odd diagnostic bytes (bytes 9, 11, to 23) for
a channel of the module.
Table B-24
Byte 8-23
odd
424
Byte
Bit
7
Channel error 7
6
Channel error 6
5
...
4
...
3
...
2
...
1
Channel error 1
0
Channel error 0
Even diagnostic byte for a channel of the SM 431; AI 8 x RTD x 16 bit
Byte
Bit
7
Overflow
6
Underflow
5
0
4
Wire break
3
0
2
0
1
0
0
Configuring/parameter assignment error
Odd diagnostic byte for a channel of the SM 431; AI 8 x RTD x 16 bit
Byte
Bit
7
User calibration does not correspond to the parameter assignment
6
Open conductor in the current source
5
0
4
Underrange or overrange
3
Run time calibration error
2
Open conductor in - direction
1
Open conductor in + direction
0
User connection not wired
Meaning
Meaning
Meaning
S7-400 Automation System Module Data
Reference Manual, Ausgabe 11/2016, A5E00850736-08
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