Siemens Simatic S7-400 - Manual (Page 585)

Diagnostic Data of the Signal Modules
B-11
S7-400, M7-400 Programmable Controllers Module Specifications
A5E00069467-07
Bytes 4 to 10 of the SM 422; DO 32 24 VDC/0.5 A
Byte 4
7 6 0 5 4 3 2 1
Byte 5
7 0
Channel type B#16#72: digital output
Number of diagnostics bits that the module
outputs per channel: 8 bits long
Byte 6
7 0
Number of channels of the same
type in one module: 32 channels
Byte 7
7 6 0
Channel error, channel 0
Channel error, channel 1
Channel error, channel 6
Channel error, channel 7
5 4 3 2 1
...
0
Byte 8
7 6 0
Channel error, channel 14
Channel error, channel 15
5 4 3 2 1
...
Channel error, channel 8
Channel error, channel 9
Byte 9
7 6 0
Channel error, channel 17
Channel error, channel 22
Channel error, channel 23
5 4 3 2 1
...
Channel error, channel 16
Byte 10
7 6 0
Channel error, channel 30
Channel error, channel 31
5 4 3 2 1
...
Channel error, channel 25
Channel error, channel 24
Figure B-12 Bytes 4 to 10 of the Diagnostic Data of the SM 422; DO 32 x 24 VDC/0.5 A