
Diagnostic data of signal modules
B.4 Diagnostic data of the digital output modules as of byte 2
S7-400 Automation System Module Data
Reference Manual, Edition 09/2009, A5E00850736-06
429
Bytes 4 and 8 of the SM 422; DO 16 x DC 20-125 V/1.5 A
Table B- 10 Bytes 4 to 8 of the diagnostic data of the SM 422; DO 16 x DC 20-125 V/1.5 A
Byte Bit Meaning
7 0
6
5
4
3
2
1
Byte 4
0
Channel type B#16#72: digital output
7
Byte 5
0
Number of diagnostics bits that the module outputs per channel: 8 bits long
7
Byte 6
0
Number of channels of the same type in one module: 16 channels
7 Channel error 7
6 Channel error 6
5 ...
4 ...
3 ...
2 ...
1 Channel error 1
Byte 7
0 Channel error 0
7 Channel error 15
6 Channel error 14
5 ...
4 ...
3 ...
2 ...
1 Channel error 9
Byte 8
0 Channel error 8
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