Siemens SIMATIC S7-400 Reference Manual page 418
Automation system module
data
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Diagnostic data of signal modules
B.4 Diagnostic data of the digital output modules as of byte 2
Bytes 4 to 8 of the SM 422; DO 16 x AC 20-120 V/2 A
Table B-16
Byte 4
Byte 5
Byte 6
Byte 7
418
Bytes 4 to 8 of the diagnostic data of the SM 422; DO 16 x AC 20-120 V/2 A
Byte
Bit
7
0
6
Channel type B#16#72: digital output
5
4
3
2
1
0
7
Number of diagnostics bits that the module outputs per channel: 8 bits long
0
7
Number of channels of the same type in one module: 16 channels
0
7
Channel error 7
6
Channel error 6
5
...
4
...
3
...
2
...
1
Channel error 1
0
Channel error 0
Meaning
S7-400 Automation System Module Data
Reference Manual, Ausgabe 11/2016, A5E00850736-08
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