Byte
Bit
Meaning
Byte 3
7
0
6
Hardware interrupt lost
5
0
4
0
3
0
2
EPROM error
1
0
0
0
Bytes 4 to 8 of the SM 421; DI 16 x UC 24/60 V
Table B-7
Bytes 4 to 8 of the diagnostic data of the SM 421; DI 16 x UC 24/60 V
Byte
Bit
Meaning
Byte 4
7
0
6
Channel type B#16#70: Digital input
5
4
3
2
1
0
Byte 5
7
Number of diagnostics bits that the module outputs per channel: 8 bits long
0
Byte 6
7
Number of channels of the same type in one module: 16 channels
0
Diagnostic data of signal modules
B.3 Diagnostic data of the digital input modules as of byte 2
S7-400 Automation System Module Data
410
Reference Manual, Ausgabe 11/2016, A5E00850736-08