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Diagnostic data of signal modules
B.3 Diagnostic data of the digital input modules as of byte 2
S7-400 Automation System Module Data
Reference Manual, Edition 09/2009, A5E00850736-06
425
Bytes 9 to 24 of the SM 421; DI 16 x DC 24 V
Data record 1 contains the channel-specific diagnostic data, starting at bytes 9 to 24. The
figure below shows the assignment of the diagnostic byte for a channel of the module.
Table B- 5 Diagnostic byte for a channel of the SM 421; DI 16 x DC 24 V
Byte Bit Meaning
7 0
6 0
5 Sensor supply missing
4 Wire break
3 0
2 0
1 0
Bytes 9 - 24
0 Configuring/parameter assignment error
Bytes 2 and 3 of the SM 421; DI 16 x UC 24/60 V
Table B- 6 Bytes 2 and 3 of the diagnostic data of the SM 421; DI 16 x UC 24/60 V
Byte Bit Meaning
7 0
6 0
5 0
4 0
3 0
2 Operating mode 0: RUN; 1: STOP
1 0
Byte 2
0 0
7 0
6 Hardware interrupt lost
5 0
4 0
3 0
2 EPROM error
1 0
Byte 3
0 0
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